Deafblindness: a review of the literature

3D printing as assistive technology for individuals with deafblindness: perspectives of rehabilitation professionals

There is a growing body of evidence on practical applications of three-dimensional (3D) printing to support the rehabilitation of individuals with sensory impairments. However, applications in the field of deafblindness, or the combination of vision and hearing impairment, remain scarce. Therefore, the present study aimed to explore actual and potential applications of 3D printing in deafblindness rehabilitation from the perspective of rehabilitation professionals in two focus group discussions that involved orientation and mobility specialists, vision rehabilitation specialists, audiologists, and braille technicians. Participants exchanged on 1) 3D printing applications to address their clients' rehabilitation needs, 2) factors that can impact its integration into their practice, and 3) the ideal logistics for producing and delivering 3D printed products. Educative models and functional adaptations were identified to improve communication, learning, mobility, and independent living skills for individuals with deafblindness. Professionals agreed that the main barriers limiting 3D printing adoption were linked to time constraints and insufficient awareness or knowledge about this technology, while the most crucial facilitator was the promotion of interdisciplinary collaborations with 3D printing experts. The present findings thus emphasize the need for global collaborations, knowledge dissemination, and ongoing research and validation of 3D printing applications to support individuals with deafblindness.

Health, education and well-being for children with deafblindness: a secondary analysis of 36 Multiple Indicator Cluster Surveys

OBJECTIVE

To examine the health, education and social inequities experienced by children with deafblindness in low- and middle-income countries.

DESIGN

Secondary analysis of 36 Multiple Indicator Cluster Surveys (2017-2020), using age-adjusted modified Poisson models to compare outcomes between children with and without deafblindness.

SETTING

36 low- and middle-income countries.

PATIENTS

446 233 children aged 2-17, including 232 children with deafblindness.

MAIN OUTCOME MEASURES

Education (primary school attendance rate, secondary school attendance rate, early childhood education and the Early Childhood Development Index), health (stunting, wasting, health insurance, diarrhoeal disease and acute respiratory infection) and well-being (inadequate supervision, violent discipline, living arrangements, birth registration and poverty status) were measured.

RESULTS

Children with deafblindness faced inequities in health and education indicators compared with children with other disabilities and children without disabilities. Children with deafblindness had consistently lower school attendance rates across school ages (primary: adjusted Prevalence Ratio (aPR) 0.30 (0.18 to 0.50); secondary: aPR 0.42 (0.20 to 0.87)), had worse Early Childhood Development Indices (aPR 0.35 (0.22 to 0.55)) and had 2-3 times higher prevalence of nutritional disorders (stunting: aPR 1.24 (1.03 to 1.50); wasting: aPR 2.79 (1.99 to 3.92)). However, there were non-significant differences in well-being indicators, such as poverty, inadequate supervision, birth registration and living situation. Children with deafblindness were also less likely to experience violent discipline.

CONCLUSION

Children with deafblindness constitute a heterogeneous group of children with disabilities. They face persistent barriers in accessing education and have poorer health, which must be addressed through building more disability-inclusive health and education systems.

Adoption and usability of a braille communication assistive device (CAD) for face-to-face and remote communication in two users with deafblindness

PURPOSE

There are currently no best practice training methods with communication assistive devices (CAD) for individuals with deafblindness using a braille display notetaker connected to an iPhone. Therefore, to capture adoption and usability of braille CAD in clinic, the Technology development and evaluation model of Schulz et al. (2015) was applied. Objectives were 1-to measure the level of difficulty in life habits involving communication before, during and after training with a braille CAD, 2-to document the feasibility of training for face-to-face and remote communication, 3-to simulate and assess communication exchanges with an unknown hearing person face-to-face, and 4-to document the long-term usability and adoption of CAD.

METHODS

A case study involved a 68-year-old woman and a 55-year-old man with Usher syndrome who have recently learned braille. Therapies were 90 min./week and 120 min. every two weeks. Data were collected with the Life habit 4.0 adapted (-3, 0, 6, 18 months), clinician workbook (monthly), filming scenario testing of communication (at 8-10 months) and observation grids (experience of usability, communication interaction).

RESULTS

Results at 18 months revealed that communication with hearing persons, travelling outside the home alone and conducting non accessible leisure were still very difficult to impossible. Clinicians accomplished 12 modalities in therapy sessions. They encountered 14 challenges for face-to-face communication due to the instability of VoiceOver® with Notes® and French language skills. Scenarios involving commercial exchanges were not efficient (buying a pen, renewing health insurance card).

CONCLUSION

Adoption of a braille CAD for remote communication has proven satisfactory, effective but not efficient. Face-to-face communication has been non-adopted.

The International Classification of Functioning, Disability and Health (ICF) core sets for deafblindness, part II of the systematic review: linking data to the ICF categories

INTRODUCTION

Deafblindness, a health condition with varying combinations of hearing and vision impairment, affects functioning and social participation. In 2001, the World Health Organization (WHO) introduced the International Classification of Functioning, Disability, and Health (ICF) to examine human health and functioning. To use the ICF in clinical practice, smaller categories of ICF codes, referred to as Core Sets, were developed for specific health conditions. However, no ICF Core Set exists for deafblindness. As part of an ICF Core Set development, this paper examines the existing literature from an ICF perspective and links relevant data to the ICF categories.

EVIDENCE ACQUISITION

The systematic review followed the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA). Articles were selected from eight scientific databases, three journals, and Google Scholar. The research team linked outcome measures and qualitative studies to ICF codes using ICF linking rules. For each measure/qualitative study's final code list, they included each code only once after eliminating any duplicates. Subsequently, a frequency analysis was conducted, and ICF categories identified in at least five studies were included in the candidate categories list.

EVIDENCE SYNTHESIS

147 articles met the eligibility criteria. Most studies were from Europe (N.=70) and North America (N.=41). 316 categories were identified in at least five studies that belong to one of four ICF components. This includes 112 categories in the body function component, 3 categories in body structure, 163 in activities and participation, and 38 in environmental factors. Additionally, 21 personal factors relating to demographics were identified. The most frequent category was listening (category d115) at 82.31%, followed by range of emotions (category b1522) at 78.91%, hearing function (category b230) at 68.03%, and assistive products and technology for communication (category e1251) at 63.27%.

CONCLUSIONS

As the second part of the first four studies in developing ICF Core Sets for deafblindness, this review described the ICF categories relevant to the functioning of individuals with deafblindness. These categories inform the development of the Core Sets on deafblindness from the researcher's perspective. The final Core Sets will guide clinical practice, programs, and policies for individuals with deafblindness.

On Human to Robot Skill Transfer for the Execution of Complex Tactile American Sign Language Tasks with a Bimanual Robot Platform

An estimated 0.2% of the world population is living with severe deafblindness with approximately ~1.5 million Americans using tactile American Sign Language (t-ASL) as their primary form of communication. To allow them to communicate without an in-person interpreter, a bimanual robotic manipulation platform has been employed to mimic humans and execute complex bimanual t-ASL signs. In particular, a human to robot motion mapping framework for the employed platform has been developed that allows the extraction of signing trajectories based on vision-based motion capture data from a human demonstrator. The collected data have also been used to generate preprogrammed poses for text prompt playbacks on the robot system. The human to robot motion mapping problem has been formulated as a constrained optimisation problem that maps the human trajectories to corresponding robot trajectories that are as humanlike as possible, using the functional anthropomorphism approach. The efficiency of the proposed system has been experimentally validated through the execution of complex, bimanual tASL tasks.

Visualizing Worldwide Prevalence of Age-Related Dual Sensory Loss

Objectives: This study aims to create a first visualization of global prevalence of age-related dual sensory loss (DSL), significantly affecting older people's quality of life. Methods: Data from World Health Organization (WHO) regions, particularly African, American, and European, were analyzed. The study focused on DSL onset and prevalence, using adjusted life expectancy for regional comparison. Results: There were notable regional variations in DSL onset and prevalence. The African region showed consistent data, thanks to standardized methods from the World Federation of the Deafblind. However, global patterns varied when adjusted for life expectancy, hinting at possible DSL prevalence stabilization at older ages. Discussion: The study identifies a lack of standardization in DSL prevalence research regarding definitions, methodologies, and reporting. It calls for more uniform and thorough research methods for accurate global DSL understanding. The research highlights the complexity and challenges in determining DSL prevalence worldwide.

Using intervention mapping to develop an intervention for multiparty communication with people with congenital deafblindness

BACKGROUND

Due to their dual sensory impairment, people with congenital deafblindness (CDB) are rarely naturally involved in other people's conversations. Their communication partners find it challenging to include them in group conversations. However, overhearing others communicate is important for developing social and communication skills. Hence, we developed an intervention program to guide communication partners in offering multiparty communication to people with CDB. This article describes how the program was developed through an intervention mapping approach.

METHOD

Intervention mapping is a six-step process: logic model, model of change, program design, program production, program implementation plan, and evaluation plan. These six steps were applied to systematically develop a program to foster multiparty communication in people with CDB. Representatives of the involved groups participated in the project group and the working group to ensure feasibility and acceptability.

RESULTS

Following the intervention mapping steps resulted in creation of a program for communication partners that consists of an education session, practicals, and four video-feedback sessions. Information sessions for practitioners and managers were also developed. The program was implemented incrementally with program implementers in each organization. A subjective evaluation and an impact evaluation were done after each implementation phase.

DISCUSSION

Intervention mapping was used to develop a program that connects theory to practice. The program appeared to meet the communication partners' needs and be feasible in terms of time investment. This article offers suggestions for broadening the scope of the program to other settings and for further investigating the effects of the program on the social and communication skills of people with CDB.

Psychological and social consequences of deafblindness for siblings: a systematic literature review

The onset of deafblindness profoundly impacts both the individual with this condition and the individual's family, including siblings. While current studies have primarily focused on the impact felt by parents or spouses, the distinct experiences of siblings have received comparatively less attention. This systematic review addresses the existing research gap regarding the psychological and social consequences experienced by siblings of individuals with deafblindness. A comprehensive search was conducted across multiple electronic databases, including PsycINFO, PsycARTICLES, Dissertations & Theses (on ProQuest), ERIC (Education Resources Information Center), International Bibliography of the Social Sciences (IBSS), Sociological Abstracts, Google Scholar, PubMed, and Cairn Info. Seven studies were identified as meeting the eligibility criteria for inclusion. The review revealed that siblings of individuals with deafblindness face psychological and social challenges, including emotions such as feelings of neglect, resentment, embarrassment, jealousy, and anxiety. Siblings also grapple with communication difficulties, contributing to feelings of exclusion and insecurity. In addition, these siblings take on significant responsibilities within the family and encounter obstacles in forming relationships outside the family. These findings underscore the need of interventions to improve the well-being of siblings of individuals with deafblindness by addressing their psycho-emotional needs and promoting positive social interactions. These findings align with studies conducted on siblings of children with other disabilities. However, additional research is crucial to investigate overlooked dimensions, particularly positive factors like coping mechanisms and resilience, that may influence the mental health and social experiences of these siblings.

Multidisciplinary approach to inherited causes of dual sensory impairment

PURPOSE

This article presents a review of the main causes of inherited dual sensory impairment (DSI) with an emphasis on the multidisciplinary approach.

METHODS

A narrative review of English literature published before January 2023 was conducted using PubMed, Medline, and Scopus databases. The different causes of inherited DSI are discussed from a multidisciplinary perspective.

RESULTS

There are a wide range of dual sensory impairment (DSI), commonly referred to as blindness and deafness. While Usher syndrome is the most frequent genetic cause, other genetic syndromes such as Alport syndrome or Stickler syndrome can also lead to DSI. Various retinal phenotypes, including pigmentary retinopathy as seen in Usher syndrome, vitreoretinopathy as in Stickler syndrome, and macular dystrophy as in Alport syndrome, along with type of hearing loss (sensorineural or conductive) and additional systemic symptoms can aid in diagnostic suspicion. A thorough ophthalmologic and otorhinolaryngologic examination can help guide diagnosis, which can then be confirmed with genetic studies, crucial for determining prognosis. Effective hearing rehabilitation measures, such as hearing implants, and visual rehabilitation measures, such as low vision optical devices, are crucial for maintaining social interaction and proper development in these patients.

CONCLUSIONS

While Usher syndrome is the primary cause of inherited dual sensory impairment (DSI), other genetic syndromes can also lead to this condition. A proper diagnostic approach based on retinal phenotypes and types of hearing loss can aid in ruling out alternative causes. Multidisciplinary approaches can assist in reaching a definitive diagnosis, which has significant prognostic implications.

Skin-Integrated Wireless Odor Message Delivery Electronics for the Deaf-blind

Deaf-blindness limits daily human activities, especially interactive modes of audio and visual perception. Although the developed standards have been verified as alternative communication methods, they are uncommon to the nondisabled due to the complicated learning process and inefficiency in terms of communicating distance and throughput. Therefore, the development of communication techniques employing innate sensory abilities including olfaction related to the cerebral limbic system processing emotions, memories, and recognition has been suggested for reducing the training level and increasing communication efficiency. Here, a skin-integrated and wireless olfactory interface system exploiting arrays of miniaturized odor generators (OGs) based on melting/solidifying odorous wax to release smell is introduced for establishing an advanced communication system between deaf-blind and non-deaf-blind. By optimizing the structure design of the OGs, each OG device is as small as 0.24 cm3 (length × width × height of 11 mm × 10 mm × 2.2 mm), enabling integration of up to 8 OGs on the epidermis between nose and lip for direct and rapid olfactory drive with a weight of only 24.56 g. By generating single or mixed odors, different linked messages could be delivered to a user within a short period in a wireless and programmable way. By adopting the olfactory interface message delivery system, the recognition rates for the messages have been improved 1.5 times that of the touch-based method, while the response times were immensely decreased 4 times. Thus, the presented wearable olfactory interface system exhibits great potential as an alternative message delivery method for the deaf-blind.

Understanding the perceptions and experiences of the deafblind community about digital games

PURPOSE

Participation and accessibility issues faced by gamers with multi-sensory disabilities are themes yet to be fully understood by accessible technology researchers. In this work, we examine the personal experiences and perceptions of individuals with deafblindness who play games despite their disability, as well as the reasons that lead some of them to stop playing games.

MATERIALS AND METHODS

We conducted 60 semi-structured interviews with individuals living with deafblindness in five European countries: United Kingdom, Germany, Netherlands, Greece and Sweden.

RESULTS

Participants stated that reasons for playing games included them being a fun and entertaining hobby, for socialization and meeting others, or for occupying the mind. Reasons for stop playing games included essentially accessibility issues, followed by high cognitive demand, changes in gaming experience due their disability, financial reasons, or because the accessible version of a specific game was not considered as fun as the original one.

CONCLUSIONS

We identified that a considerable number of individuals with deafblindness enjoy playing casual mobile games such as Wordfeud and Sudoku as a pastime activity. Despite challenging accessibility issues, games provide meaningful social interactions to players with deafblindness. Finally, we introduce a set of user-driven recommendations for making digital games more accessible to players with a diverse combination of sensory abilities.IMPLICATIONS FOR REHABILITATIONDigital games were considered a fun and entertaining hobby by participants with deafblindness. Furthermore, participants play games for socialization and meeting others, or for occupying the mind.Digital games provide meaningful social interactions and past time to persons with deafblindness.On top of accessibility implications, our findings draw attention to the importance of the social element of gaming for persons with deafblindness.Based on interviews, we introduce a set of user-driven recommendations for making digital games more accessible to players with a diverse combination of sensory abilities.

The International Classification of Functioning, Disability and Health Core Set for deafblindness. Part I: a systematic review of outcome measures

INTRODUCTION

The International Classification of Functioning, Disability, and Health (ICF), developed by the World Health Organization, is a classification framework that focuses on the health and functioning of people with disabilities. As part of an ICF Core Set development, four studies need to be conducted, one of which is a systematic review. This study presents part 1 of the systematic review that aims to describe the outcome measures identified in the literature related to functioning in individuals with deafblindness.

EVIDENCE ACQUISITION

The research team screened articles from eight scientific databases, three journals, and Google Scholar (March 2011 to September 2022). Articles were included if they studied individuals with deafblindness aged 18 and older. Studies that examined genetics or laboratory experiments involving animals were excluded. Data were extracted into a logbook with key descriptors such as study location and design, age of study population, and instruments/outcome measures used, which were further categorized into one of the following types: 1) standardized; 2) patient-reported measures, standardized (PT-S); 3) patient-reported measures, not standardized (PT-not S); 4) health professional, reported measures, standardized (HP-S); 5) Technical measures; 6) other measures (parent-reported standardized and laboratory measures).

EVIDENCE SYNTHESIS

The review included 147 studies, of which most were conducted in Europe (47.6%) and North America (27.9%). Of the 314 identified outcome measures, 57 were Standardized, 59 were Patient Reported-Standardized (PT-S), 178 were patient reported non-standardized (PT-Not S) variables, 11 were health professional reported, standardized, five were technical, and four were classified as other measures.

CONCLUSIONS

Most instruments measured functioning in daily activities and the mental health of individuals with deafblindness. Three deafblind-specific instruments were identified in this study, highlighting the need for more deafblind-specific instruments to be developed and utilized in research.

Experiences of people with dual sensory loss in various areas of life: A qualitative study

Individuals with dual sensory loss (DSL) appear to have limited ability to compensate for their visual impairment with residual hearing, or for their hearing impairment with residual vision, resulting in challenges in various areas of life. The aim of this qualitative study was to explore the diverse experiences facing individuals with DSL as well as to determine how they experience sensory compensation. Semi-structured interviews were carried out in twenty adults with DSL (13 females and 7 males, mean age 47 years). The causes of DSL severity varied amongst participants. Sensory compensation and experiences in regards to access to information, mobility, communication and fatigue were discussed. Interviews were audio recorded and transcribed verbatim. Framework analysis was used to summarize and interpret the data. In relation to access to information, our results show that, despite various challenges, the use of assistive technology such as voice command functions, enabled participants to operate effectively. Regarding mobility, most participants were capable of finding their way in familiar environments. However, if the setting was unfamiliar, assistance from others or reliance on navigation applications was necessary. Participants experienced little issues with having conversations in quiet settings, however, crowded settings were considered very difficult. The final results showed that most participants suffered from fatigue. Carefully considering which daily activities were feasible and having a daily routine helped to cope with fatigue. This study revealed the experiences of individuals with DSL in important areas of life. The results suggest that, even though many challenges are experienced, individuals with DSL are resourceful in finding compensation strategies. However, capturing participants' sensory compensation experiences was challenging.

Prevalence and impact of combined vision and hearing (dual sensory) impairment: A scoping review

Hearing and vision impairments are common globally. They are often considered separately in research, and in planning and delivering services. However, they can occur concurrently, termed dual sensory impairment (DSI). The prevalence and impact of hearing and vision impairment have been well-examined, but there has been much less consideration of DSI. The aim of this scoping review was to determine the nature and extent of the evidence on prevalence and impact of DSI. Three databases were searched: MEDLINE, Embase and Global Health (April 2022). We included primary studies and systematic reviews reporting the prevalence or impact of DSI. No limits were placed on age, publication dates, or country. Only studies where the full text was available in English were included. Two reviewers independently screened titles, abstract, full texts. Data were charted by two reviewers independently using a pre-piloted form. The review identified 183 reports of 153 unique primary studies and 14 review articles. Most evidence came from high-income countries (86% of reports). Prevalence varied across reports, as did age groups of participants and definitions used. The prevalence of DSI increased with age. Impact was examined across three broad groups of outcomes-psychosocial, participation, and physical health. There was a strong trend towards poorer outcomes for people with DSI across all categories compared to people with one or neither impairment, including activities of daily living (worse for people with DSI in 78% of reports) and depression (68%). This scoping review highlights that DSI is a relatively common condition with substantial impact, particularly among older adults. There is a gap in evidence from low and middle-income countries. There is a pressing need for a consensus position on the definition(s) of DSI and standardisation of reporting age groups to enable reliable estimates to be ascertained and compared and responsive services developed.

Disparities in Inherited Retinal Degenerations

To review disparities in the field of inherited retinal degenerations to establish foundations for future discussions oriented toward finding possible solutions. A narrative overview of the literature. Despite collective efforts towards democratization of genetic testing and investigation, genetic databases containing primarily European populations are heavily relied upon. Access to specialized care and other resources is also still not available to all. Recognizing and addressing disparities and inequities within the field of inherited retinal degenerations will improve our care of these patients and our knowledge of their conditions.

Prevalence of sensory impairments in home care and long-term care using interRAI data from across Canada

BACKGROUND

In the general population, sensory impairments increase markedly with age in adults over 60 years of age. We estimated the prevalence of hearing loss only (HL), vision loss only (VL), and a combined impairment (i.e., dual sensory loss or DSL) in Canadians receiving home care (HC) or long-term care (LTC).

METHODS

Annual cross-sectional analyses were conducted using data collected with one of two interRAI assessments, one used for the HC setting (n = 2,667,199), and one for LTC (n = 1,538,691). Items in the assessments were used to measure three mutually exclusive outcomes: prevalence of VL only, HL only, or DSL. Trends over time for each outcome were examined using the Cochran-Armitage trend test. A negative binomial model was used to quantify the trends over time for each outcome while adjusting for age, sex and province.

RESULTS

In HC, there was a significant trend in the rate for all three outcomes (p < 0.001), with a small increase (roughly 1%) each year. In HC, HL was the most prevalent sensory loss, with a rate of roughly 25% to 29%, while in LTC, DSL was the most prevalent impairment, at roughly 25% across multiple years of data. In both settings, roughly 60% of the sample was female. Males in both HC and LTC had a higher prevalence of HL compared to females, but the differences were very small (no more than 2% in any given year). The prevalence of HL differed by province after adjusting for year, age and sex. Compared to Ontario, Yukon Territory had a 26% higher rate of HL in HC (relative rate [RR] = 1.26; 95% confidence interval [CI]:1.11, 1.43), but LTC residents in Newfoundland and Labrador had a significantly lower rate of HL (RR: 0.57; CI: 0.43, 0.76).When combined, approximately 60% of LTC residents, or HC clients, had at least one sensory impairment.

CONCLUSIONS

Sensory impairments are highly prevalent in both HC and LTC, with small sex-related differences and some variation across Canadian provinces. The interRAI assessments provide clinicians with valuable information to inform care planning and can also be used to estimate the prevalence of these impairments in specific population sub-groups.

Quality of Life in Deafblind People and Its Effect on the Processes of Educational Adaptation and Social Inclusion in Canary Islands, Spain

Deafblindness is a unique and complex disability. Research on the needs and quality of life are scarce; as well as the lack of adequate knowledge, training and lack of qualified professionals to serve this group. All this justifies the sense and interest of this study. This study is derived from the project with reference 2020EDU04. Design: The study is descriptive, cross-sectional and quantitative-qualitative research design was conducted. Objectives: Know and analyze the needs of adult deafblind people in order to contribute to improving their quality of life. Method: Sample of 16 adults with double sensory loss (hearing and vision) residing in the Autonomous Community of the Canary Islands (Spain) was used. Instruments: The FUMAT Scale was used to measure personal development; self-determination; interpersonal relationships; social inclusion; rights of deafblind people; emotional well-being; physical well-being and material well-being. In addition, a semi-structured interview is conducted. Results by dimensions: Personal development: The professionals did not have specialized training to provide an educational response. Physical well-being: 68% of the sample had other health problems associated with deafblindness. Interpersonal relationships: 100% of the sample reported communication problems in the family environment. Social inclusion: They reported difficulties in accessing educational and leisure activities. Material well-being: In general, they stated that they have the material resources necessary for their daily lives. Self-determination: they consider that they have decision-making capacity in basic aspects of daily life. Rights: Deafblind people state that they have limitations in exercising their rights. Based on the interviews, it was observed that the people with the greatest difficulties in daily life are those who presented the greatest visual commitment. Conclusion: The etiology does not determine the quality of life of deafblind people, but communication conditions interpersonal relationships and personal development, and therefore their quality of life.

Rehabilitation healthcare professionals' competence and confidence in differentially diagnosing deafblindness from autism spectrum disorders: a cross-sectional survey in South Africa

BACKGROUND

Early diagnosis and management of children who are deafblind is important to alleviate the effects of deafblindness on the development of the child who is deafblind and their families. However, children who are deafblind are often misdiagnosed or diagnosed late. The misdiagnosis or late diagnosis has been attributed to many factors, one of which is the competence and confidence of healthcare professionals in differentially diagnosing deafblindness from other conditions, in most cases, autism spectrum disorder (ASD). The study therefore aimed to establish the competence and confidence of rehabilitation healthcare professionals in differentially diagnosing deafblindness from ASD in the South African context.

METHODS

A cross-sectional survey design was employed for the study. An online questionnaire was distributed to rehabilitation healthcare professionals (N = 78) via Survey Monkey. Data were analyzed using descriptive and inferential statistics. Ethical clearance and permission were obtained from relevant stakeholders prior to the commencement of the study.

RESULTS

Regarding the rehabilitation healthcare professionals in this study, 54% were competent in diagnosing ASD, while only 35% could correctly diagnose deafblindness. In some instances, symptoms were classified as associated with both ASD and deafblindness, when they were just those of deafblindness. Of all the rehabilitation healthcare professionals in this study, speech language therapists displayed the most knowledge of deafblindness. Furthermore, healthcare professionals who had between one and nine years of working experience had more knowledge of deafblindness than other professionals with more or less experience.

CONCLUSION

Deafblindness is often underdiagnosed or misdiagnosed as ASD. This is due to the lack of competence and confidence of rehabilitation healthcare professionals in diagnosing it. The findings therefore highlight the need for training of rehabilitation healthcare professionals. Training on deafblindness could be included as part of the curriculum in the various undergraduate programs. Deafblindness could also form part of the Continuous Professional Development (CPD) training programs at various healthcare facilities. A team approach to the training would be ideal as it would facilitate peer learning and support. More research is required as it would inform evidence-based assessment, and management and support strategies for children who are deafblind and their families.

A salutogenesis approach to ageing with impairment: the managing and coping experiences of older people ageing with deafblindness

An understanding of the psychosocial impact of deafblindness on older people is impoverished by a dearth of research in the field. Particularly limited are studies adopting a salutogenesis perspective, in which older deafblind people's coping capacities are explored. Much research focuses on vulnerability to unfavourable outcomes, which may perpetuate negative stereotypes of deafblind people as passive and dependent. Identifying deafblind people as a vulnerable group gives rise to misunderstanding of the impairment, perceptions of incapability and neglect of deafblind people's agency. This paper draws on data from the first United Kingdom-based study of vulnerability from the perspectives of older adults ageing with deafblindness. Findings presented here relate to participants’ experiences of managing and coping with their felt vulnerability and ageing with deafblindness. The study adopted interpretative phenomenological analysis (IPA) as its qualitative approach. In-depth semi-structured interviews were undertaken between October 2014 and July 2016 with eight participants, aged between 48 and 83 years. Data were analysed using an iterative six-step IPA process. Three superordinate themes were identified: taking action to protect self; psychological coping strategies; and accessing and using care and support. Participants’ managing and coping strategies, and the care and support they value, respond to elements identified as generating felt vulnerability. Professionals should seek to bolster coping capacity and provide support in ways valued by those ageing with deafblindness.

Longitudinal Associations of Self-Reported Visual, Hearing, and Dual Sensory Difficulties With Symptoms of Depression Among Older Adults in the United States

Evidence conflicts on the association between sensory difficulty and depression. Few studies have examined this association using longitudinal or population-based data. We used data from Rounds 1-9 of the nationally representative National Health and Aging Trends Study to evaluate the longitudinal association between self-reported visual, hearing, and dual sensory difficulties and clinically significant depressive symptoms. Multivariable Cox regression models were used to evaluate the hazard of incident depressive symptoms. Group-based trajectory modeling identified depressive symptom trajectories (DSTs). Multinomial logistic regression was used to examine the association between sensory status and DSTs. A total of 7,593 participants were included: 56.5% were female, 53.0% were 65-74 years old, 19.0% (95% CI 17.9-20.2%) had hearing, 5.6% (4.9-6.4%) had visual, and 3.3% (2.9-3.8%) had dual sensory difficulties at baseline. Hazard ratios for depressive symptoms in those with visual, hearing, and dual sensory difficulties were 1.25 (95% CI 1.00-1.56, p = 0.047), 0.98 (95% CI 0.82-1.18, p = 0.82), and 1.67 (95% CI 1.29-2.16, p < 0.001), respectively, relative to those without sensory difficulty. A model with four trajectory groups best fit the data. Group 1 (35.8% of the sample, 95% CI: 34.1-37.4) had persistently low risk of depressive symptoms; Group 2 (44.8%, 43.4-46.3) had low but increasing risk; Group 3 (7.1%, 6.2-8.3) had moderate risk; and Group 4 (12.4%, 11.5-13.3) had moderate to high risk that increased. Compared to those without sensory difficulties, individuals with each difficulty were significantly more likely to belong to a group other than Group 1. This study reveals associations between sensory difficulties and mental health that can inform public health interventions.

Prevalence of Individuals with Deafblindness and Age-Related Dual-Sensory Loss

Introduction

The authors of this paper have compiled a report on the prevalence of deafblindness and dual-sensory loss based on the review of existing estimates. The purpose is to inform readers of the importance of using consistent, well-researched definitions and survey questions in future prevalence studies.

Methods

Articles were extracted through ProQuest and EBSCOhost, online library databases of Cambrian College and Laurentian University. Keywords search included “deafblindness,” “dual-sensory impairment,” “dual-sensory loss,” “age-related,” “congenital,” “acquired,” and “prevalence.” Additionally, the authors conducted a search with Google for research reports and Google Scholar for other relevant peer-reviewed articles.

Results

This review provides a current overview of prevalence estimates of deafblindness and age-related dual-sensory loss around the world, examining 19 articles or reports published over the last 20 years (2000–2020) in 18 countries, including the European Union (consisting of 8 countries). In line with the prevalence estimates by the World Federation for the Deafblind global report 2018, the review indicates an estimated 0.2–2% prevalence of dual-sensory impairment and underscores varying ranges of prevalence among populations, studies or countries, age groups, and types of deafblindness. The review highlights that the prevalence of deafblindness or dual-sensory loss was often not comparable across studies, but it is clear that the prevalence of dual-sensory impairment increases with age. The studies varied in methods (e.g., population surveys, cross-sectional, and longitudinal studies).

Implication for practitioners

The review provides evidence of varying ranges of prevalence rates. Future prevalence studies may benefit from consistent definitions, standard data-collection tools to do better comparisons across countries, and identify factors that predict higher or lower prevalence rates among populations and age groups.

Factors that influence the participation of individuals with deafblindness: A qualitative study with rehabilitation service providers in India

Evidence to inform rehabilitation service delivery for individuals with deafblindness, especially in the Indian context, is inadequate. Rehabilitation professionals often find it challenging to design rehabilitation interventions that promote participation for those with deafblindness. Therefore, our purpose was to understand the contextual factors that influence the participation of individuals with deafblindness in India from the perspectives of those who are involved in providing rehabilitation services to them. Using the International Classification of Functioning, Disability, and Health (ICF) as a framework, we conducted two focus group discussions with 16 rehabilitation service providers in India. We used a content analysis approach to examine the data. Rehabilitation service providers perceived participation barriers to be linked primarily to the social environment. Specifically, participants identified four major factors acting as barriers, including (a) lack of awareness about deafblindness; (b) negative attitudes and stigma associated with disability; (c) lack of access to resources such as assistive technology and interpreter support; and (d) communication challenges associated with severe impairments. Facilitators include accessibility of the built environment for multisensory impairments, affordable technology, provision of an interpreter and personal support worker, and training on deafblindness for professionals. The participation of individuals with deafblindness could be enhanced by identifying and removing environmental barriers and improving knowledge about deafblindness among rehabilitation professionals for proper identification, assessment, and access to rehabilitation services.

The development of the International Classification of Functioning, Disability and Health Core Sets for deafblindness: A study protocol

BACKGROUND

Individuals with deafblindness experience a combination of hearing and vision impairments. The World Health Organization has developed a global framework referred to as the International Classification of Functioning, Disability and Health (ICF) to describe health and functioning. From the full ICF classification, a selection of categories, referred to as ICF Core Sets, provide users with a tool to describe functioning and disability in specific health conditions. There has been no ICF Core Set created for deafblindness. Given that core sets are instrumental in improving clinical practice, research, and service delivery, the aim of this study is to develop an ICF Core Set for deafblindness.

METHODS

As part of the preparatory phase in the ICF Core Set development, there are four studies that will be conducted. This includes the [1] systematic literature review that examines the researcher's perspective, [2] qualitative study focusing on the individuals with deafblindness experience, [3] experts survey that looks at health professional's perspective, and [4] empirical study that examines the clinical perspective. The studies will be conducted using the principles outlined by the ICF Research Branch for the development of ICF Core Sets. The systematic literature review protocol was submitted for registration on PROSPERO CRD42021247952.

DISCUSSION

An ICF Core Set created for deafblindness will benefit individuals living with deafblindness who are often excluded from social participation, policies, and services. An ICF Core Set for deafblindness will have a significant impact on healthcare professionals, policymakers, researchers, service providers and individuals with deafblindness by facilitating communication among all stakeholder to support the functioning of those with deafblindness.

Use of three-dimensional printing as a rehabilitation tool for individuals with deafblindness or vision impairment: a scoping review protocol

OBJECTIVE

This scoping review aims to synthesize evidence on the practices involving additive manufacturing, also known as three-dimensional printing, as a rehabilitation tool to assist individuals with deafblindness or vision impairment, and to identify which International Classification of Functioning, Disability and Health domains of functioning can be improved by its use. The goal is to inform health care professionals and family caregivers on how additive manufacturing may enhance the quality of life of people with deafblindness or vision impairment.

INTRODUCTION

Deafblindness and vision impairment impact many life domains, such as access to information, communication, and mobility. The sense of touch is the main gateway for communication for individuals living with these impairments. Additive manufacturing is a promising technology for producing customized, tactile-based, low-cost tangible objects and devices that could improve the functioning of those with sensory impairment. Emerging studies explore the benefits of additive manufacturing in rehabilitation, education, and inclusion of people living with vision impairment, but very little is known about its use for the deafblind.

INCLUSION CRITERIA

This review will consider studies that focus on the most widespread additive manufacturing technologies for the use of individuals living with deafblindness or vision impairment, their family caregivers, or professionals who provide their rehabilitation care.

METHODS

A comprehensive search of 10 databases (PsycINFO, MEDLINE, Global Health, PubMed, CINAHL, Embase, ERIC, Web of Science, Engineering Village, and Scopus) will be conducted. Screening of records will be done at the title/abstract level and at the full-text level by independent reviewers of the team.

Cognitive Impairment in Older Adults With Concurrent Hearing and Vision Impairment: A Systematic Scoping Review Protocol

Introduction: As the prevalence of age-related sensory impairment increases, more evidence emerges on the association between uni-sensory and cognitive impairment (CI) in older adults. However, the link between CI and concurrent hearing and vision impairment (referred to as dual sensory impairment/DSI) is not well-understood, and this combined effect may be additive or multiplicative. Moreover, the existing evidence on CI in older adults with DSI is scattered and limited. Through this systematic scoping review, we aim to map existing evidence on CI in older adults with DSI, and to summarize what is known about the prevalence, incidence and risk factors of CI, and tools used to screen or assess CI in older adults with DSI. Methods and Analysis: We will use the Joanna Briggs Institute framework to perform the review. Eleven databases [MEDLINE, CINAHL/EBSCO, EMBASE, Mednar, WorldWideScience, PsycEXTRA, OAIster, OpenGrey (SIGLE), Global Health, PsycINFO, and Web of Science] and clinical trial registries (ISRCTN Registry, WHO ICTRP, and ClinicalTrials.gov) will be searched. Study selection will be completed using Covidence, and data will be extracted using an a priori data extraction tool. To be included, studies had to be peer-reviewed, had older adults with DSI as the focal population, and are related to CI. Data will be presented using a narrative summary with emphasis on implications for future research and practice. Discussion: Reliable cognitive screening is of the utmost importance for prevention and treatment of CI within DSI population. The study findings will have significant implications for health services delivery and policy research. The summarized findings on the prevalence, incidence, associated risk factors, and CI screening and assessment tools will inform geriatric care. The review will also document knowledge gaps on CI in the DSI population and identify areas of interest for future studies. Ethics and Dissemination: The scoping study, being a review of existing documents, does not require ethics approval. The findings will be disseminated with relevant stakeholders using knowledge translation activities such as scientific presentations and publications. We intend to use the findings to conduct a Delphi study to evaluate which CI tools are suitable for older population with DSI.

Unraveling the genetic complexities of combined retinal dystrophy and hearing impairment

Usher syndrome, the most prevalent cause of combined hereditary vision and hearing impairment, is clinically and genetically heterogeneous. Moreover, several conditions with phenotypes overlapping Usher syndrome have been described. This makes the molecular diagnosis of hereditary deaf–blindness challenging. Here, we performed exome sequencing and analysis on 7 Mexican and 52 Iranian probands with combined retinal degeneration and hearing impairment (without intellectual disability). Clinical assessment involved ophthalmological examination and hearing loss questionnaire. Usher syndrome, most frequently due to biallelic variants in MYO7A (USH1B in 16 probands), USH2A (17 probands), and ADGRV1 (USH2C in 7 probands), was diagnosed in 44 of 59 (75%) unrelated probands. Almost half of the identified variants were novel. Nine of 59 (15%) probands displayed other genetic entities with dual sensory impairment, including Alström syndrome (3 patients), cone-rod dystrophy and hearing loss 1 (2 probands), and Heimler syndrome (1 patient). Unexpected findings included one proband each with Scheie syndrome, coenzyme Q10 deficiency, and pseudoxanthoma elasticum. In four probands, including three Usher cases, dual sensory impairment was either modified/aggravated or caused by variants in distinct genes associated with retinal degeneration and/or hearing loss. The overall diagnostic yield of whole exome analysis in our deaf–blind cohort was 92%. Two (3%) probands were partially solved and only 3 (5%) remained without any molecular diagnosis. In many cases, the molecular diagnosis is important to guide genetic counseling, to support prognostic outcomes and decisions with currently available and evolving treatment modalities.

Living with deafblindness during COVID-19: An international webinar to facilitate global knowledge translation

Arguably, individuals living with deafblindness are among the hardest hit by the effects of the corona virus disease of 2019 (COVID- 19), given the importance of the sense of touch for their ability to interact with the world. To address this challenge, it is imperative to facilitate the implementation of evidence- and experience-based recommendations, and to improve knowledge translation on a global scale. Deafblind International organized a webinar to provide a platform where participants could exchange experiences and solutions to overcome the challenges created by the arrival of COVID-19, in order to facilitate information exchange among stakeholders in deafblindness during this pandemic. We present an overview of its content here and place the summarized themes in context with existing research literature. Abstract submission was open for 4 weeks in May 2020, resulting in 30 submissions from 13 countries across 5 continents. Of the 26 presenter teams, 9 (35%) had a co-presenter that was living with deafblindness themselves. The number of individual participants across all sessions ranged from 55 to 140 ( M = 98), with a total of 3709 session registrations overall, and the organizers estimate a total attendance of around 400 participants. Based on extensive field notes taken during the webinar, and repeated viewing of the recordings, qualitative description allowed the team to synthesize eight principal themes across the event: access to information, communication, service accessibility, adaptations to service delivery, online safety and security, physical distancing, mental health and research. The first Deafblind International webinar was able to fill an important gap by bringing together a variety of stakeholders in deafblindness across the globe. The event created a sense of group membership and peer support, brought the participants, researchers, the professionals as well as their service agencies closer together and generated a sense of hope and collaboration.

Informed Consent or Assent Strategies for Research With Individuals With Deafblindness or Dual Sensory Impairment: A Scoping Review

OBJECTIVE

To synthesize evidence on existing informed consent/assent strategies and processes that enable the participation of individuazls with deafblindness or dual sensory impairment in research.

DATA SOURCES

Five scientific databases (PubMed, MEDLINE, Cumulative Index to Nursing and Allied Health, Web of Science, and PsycINFO) and other sources such as Google Scholar, Journal of Visual Impairment and Blindness, and British Journal of Visual Impairment were hand-searched from January 2015 until July 2020.

STUDY SELECTION

Studies were selected using a priori inclusion criteria of sensory and cognitive disabilities and focused on consent/assent strategies and processes in research within this population. Articles related to the medical or sexual consent processes were excluded.

DATA EXTRACTION

An Excel spreadsheet was used to extract data from the eligible sources. Discrepancies were resolved in discussion with team members.

DATA SYNTHESIS

A total of 2163 sources were screened, and 16 articles were included in the review. Seven sources only examined consent strategies, whereas the remaining 8 included a combination of consent/assent and dissent strategies. Using thematic analysis, 3 key themes emerged: consent/assent strategies, researcher capacity, and capacity to consent tools. Key identified strategies included the accessibility of the consent/assent process, building relationships with participants and caregivers, identifying behavioral cues, and communication training for researchers.

CONCLUSIONS

Despite the absence of literature on consent/assent strategies within the population with deafblindness, the review found promising strategies applied to individuals with other cognitive or sensory disabilities that researchers can adopt. Researchers are encouraged to use best practices in creating an inclusive research environment to include individuals with deafblindness.

Device abandonment in deafblindness: a scoping review of the intersection of functionality and usability through the International Classification of Functioning, Disability and Health lens

OBJECTIVES

Abandonment of vision, hearing or mobility aids suggests common barriers and facilitators to ongoing device use. However, the possible interactive effects of combined hearing and vision disabilities on device use by those living with deafblindness are unclear. Here we summarise existing knowledge on variables influencing assistive technology use from the perspective of persons living with deafblindness. We used the WHO's International Classification of Functioning, Disability and Health (ICF) framework to contextualise the findings, asking 'What is currently known about variables influencing the (non-)use of assistive devices recommended for persons with deafblindness?'

DESIGN

A scoping review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews Checklist.

DATA SOURCES

PubMed; ProQuest: ERIC; ProQuest Dissertation; ProQuest: Sociological Thesaurus; Web of Science; Scientific Electronic Library Online; Bielefeld Academic Search Engine; Pascal & Francis; APA PsycINFO and Ebsco for CINAHL were searched through 9 November 2020.

ELIGIBILITY CRITERIA

We included peer-reviewed studies that reported on assistive technology, device abandonment/utilisation and provided data from persons living with deafblindness.

DATA EXTRACTION AND SYNTHESIS

Four team members independently scored 83 studies for eligibility.

RESULTS

Ten articles were chosen for data extraction. The emerging variables replicated established categories of barriers and facilitators: personal, device-related, environmental and intervention variables. The use of the ICF highlighted how an intermediate variable (eg, device acceptability) was necessary in order for a variable to become a barrier or a facilitator to device use.

CONCLUSIONS

The variables influencing device use by persons with deafblindness followed the same categories described for single impairments. Usability was challenged in devices that rely on the 'other' sense. Haptic and tactile aids are rarely studied. The limited available information and the dire need for assistive technologies for people with deafblindness emphasises the urgency of research and technology development for this marginalised population.

GoCC4All a pervasive technology to provide access to TV to the deafblind community

Considering the importance of communication and independence for the deafblind community, this work presents findings of the use of technology to address the lack of information due to communication challenges among the deafblind community. Over time, many investigations have been carried out regarding this matter, but very few providing solution, which is why this study emerged, looking to making all the information broadcasted through television accessible for this community. The work team designed a technology (GoCC4All) to address the needs of the deafblind community. GoCC4All provides access to captions available on TV through braille displays and mobile devices. Our research process and results outline the path for creating, adapting, and adopting new technologies for people with disabilities who have the right to access the information just as their peers without disabilities. The information in this paper is based on two surveys, an initial beta testing (BT) and a final survey among a group of 14 users (UT) who tested the GoCC4All application. Our findings support the positive impact of the iterative creation of assistive technology based on users' experience and users' recommendations to better serve the needs of the deafblind community.

What couples say about living and coping with sensory loss: a qualitative analysis of open-ended survey responses

The current study reports the results of open-ended questions from a follow-up survey of adults with sensory loss and their spouses who had previously taken part in an online study. In total, 111 participants completed the survey (72 adults with a sensory loss and 39 spouses). Open-ended questions asked about the overall experience of living with sensory loss, sensory loss-related challenges, and support and coping mechanisms. Thematic analysis was used to identify dominant themes in participants' responses. Three core themes capturing their overall experience emerged: (1) sensory loss-related challenges, (2) support and coping, and (3) adjustment and readjustment. Sensory loss was characterized as a challenging experience, causing communication and emotional disturbances. Coping strategies reported by both partners included the use of assistive technology, positive re-appraisal, acceptance and/or denial of the loss, while support strategies were mostly derived from the comments of spouses (for AWSLs), family members and peer networks (for both partners). Finally, respondents described sensory loss as an adventurous learning experience. Our findings underscore the significance of considering sensory loss from a social relational/family perspective and highlight the importance of addressing the needs of both adults with sensory loss and their partners in treatment and rehabilitation.Implications for rehabilitationStudy highlights the need to consider sensory loss from a relational/family perspective.Healthcare professionals should try to increase the involvement of significant others and close family members (e.g., spouses, parents, children) into the rehabilitation process.Greater emphasis should be placed on exploring and reinforcing positive experiences and attitudes associated with sensory loss during counselling/rehabilitation sessions.Improved education about sensory loss for both the general public and health care professionals could minimize the adverse outcomes associated with sensory loss.

Exploring Professionals' Experiences in the Rehabilitation of Older Clients with Dual-Sensory Impairment

En vue de mieux comprendre et d'améliorer le processus de réadaptation des personnes âgées présentant à la fois une déficience auditive et visuelle, soit une double déficience sensorielle (DDS), cette étude s'est penchée sur les perspectives des professionnels de la santé qui œuvrent chez cette population. Treize professionnels aux parcours variés ont été interviewés en lien avec leur expérience de travail auprès de personnes âgées avec DDS. Les entrevues ont été transcrites et codées, et une analyse de contenu a été effectuée. Les participants des diverses professions ont perçu qu'ils devaient assumer les rôles additionnels suivants : (1) conseiller, (2) guide, (3) formateur ou rééducateur. Ces rôles consistaient à aider les personnes avec DDS et leurs familles présentant une dépression, des problèmes d'acceptation, des consultations répétées et des parcours complexes dans le système de santé. Selon les professionnels interviewés, ces rôles supplémentaires accroissent leur charge de travail et les confrontent à des problématiques pour lesquelles ils n'ont pas reçu de formation. Ils suggèrent l'implantation d'une formation sur les DDS pour les professionnels et les membres de la famille concernés, ainsi qu'une approche de réadaptation en équipe multidisciplinaire.

To better understand and improve the rehabilitation process of older adults with sensory losses in both hearing and vision or dual sensory impairment (DSI), this study explored the perspectives of health care professionals who work with this population. Thirteen individuals, with varied professional backgrounds, were interviewed about their experiences in working with older adults with DSI. We transcribed and coded the interviews, then conducted content analysis. Regardless of their professional backgrounds, the participants reported additional roles that they perceived they fulfilled: (a) counsellor, (b) navigator, and (c) trainer and re-trainer. These roles involved helping individuals with DSI, and their family, with depression, acceptance, repeat consultations, and way-finding through the health system. From the professionals’ perspective, these additional roles increase workload and place them in situations they were not trained for. They suggest education for all professionals and for family members working with people with DSI; moreover, they suggest a multidisciplinary team rehabilitation approach.

Clinical genetics, practice, and research of deafblindness: From uncollected experiences to the national registry in Japan

Deafblindness is a condition of combined vision and hearing loss that is extremely rare in children and young adults, as well as being a highly heterogeneous condition, with over 70 specific etiologies. Due to these features, sporadic clinical experiences have not been collated, which has hampered medical progress. Genetics plays a major role in the pathogenesis of deafblindness in children and young adults, with more than 50 hereditary syndromes and disorders associated with the condition, including CHARGE, Usher, Down, Stickler, and Dandy-Walker syndromes, which are the most common. Clinical diagnosis of deafblindness is often difficult, and a significant proportion of patients are undiagnosed. No curative therapy is currently available for the majority of patients with hereditary deafblindness; however, experimental studies using animal models have shown promising results by targeting specific genes that cause vision or hearing loss. In Japan, the Rare Disease Data Registry of Japan (RADDAR-J) has been established as a national registry of rare and intractable diseases. Diseases of deafblindness have been elected as a disease category in RADDAR-J. Currently, clinical and genomic data are being collected and analyzed using this system, with the aim of generating an overview of deafblindness to improve medical practice.

Tacsac: A Wearable Haptic Device with Capacitive Touch-Sensing Capability for Tactile Display

This paper presents a dual-function wearable device (Tacsac) with capacitive tactile sensing and integrated tactile feedback capability to enable communication among deafblind people. Tacsac has a skin contactor which enhances localized vibrotactile stimulation of the skin as a means of feedback to the user. It comprises two main modules—the touch-sensing module and the vibrotactile module; both stacked and integrated as a single device. The vibrotactile module is an electromagnetic actuator that employs a flexible coil and a permanent magnet assembled in soft poly (dimethylsiloxane) (PDMS), while the touch-sensing module is a planar capacitive metal-insulator-metal (MIM) structure. The flexible coil was fabricated on a 50 µm polyimide (PI) sheet using Lithographie Galvanoformung Abformung (LIGA) micromoulding technique. The Tacsac device has been tested for independent sensing and actuation as well as dual sensing-actuation mode. The measured vibration profiles of the actuator showed a synchronous response to external stimulus for a wide range of frequencies (10 Hz to 200 Hz) within the perceivable tactile frequency thresholds of the human hand. The resonance vibration frequency of the actuator is in the range of 60–70 Hz with an observed maximum off-plane displacement of 0.377 mm at coil current of 180 mA. The capacitive touch-sensitive layer was able to respond to touch with minimal noise both when actuator vibration is ON and OFF. A mobile application was also developed to demonstrate the application of Tacsac for communication between deafblind person wearing the device and a mobile phone user who is not deafblind. This advances existing tactile displays by providing efficient two-way communication through the use of a single device for both localized haptic feedback and touch-sensing.

Challenges of teaching the deaf-blind learner in an education setting in Johannesburg: Experiences of educators and assistant educators

BACKGROUND

Evidence suggests that educators of deaf-blind students in the South African context have specific challenges in the educational setting because of their lack of adequate knowledge on deaf-blindness and a lack of sufficient training on communication, teaching and learning strategies.

OBJECTIVES

The aim of this study was to describe the challenges experienced by educators and assistant educators of children with deaf-blindness.

METHOD

Ten educators and assistant educators were selected purposively to participate in the study (Male = 3; Female = 7; age range 31-49 years). Participants were recruited from a school for the deaf-blind in Johannesburg. Participants completed semi-structured interviews on the challenges that they experienced when educating learners who are deaf-blind.

RESULTS

Findings from the data after inductive thematic analysis suggested the following: (1) under-preparedness of educators and assistant educators, (2) communication challenges, (3) challenges related to the diversity of deaf-blind learners and (4) lack of support structures for educators and assistant educators.

CONCLUSION

There is a need for ongoing educator training on communication strategies, cultural diversity and inclusive strategies. A collaborative model of delivering training and inclusive education that will encompass educators and therapists as a means of supporting both the educator and the learner who is deaf and blind is needed. Such a collaboration may result in positive outcomes for both the educator and the deaf-blind learner.

Older Women in Australia: Facing the Challenges of Dual Sensory Loss

With the increase in longevity, the number of women living into old age is rising and higher than that of men. Data was derived from the Melbourne Longitudinal Studies on Healthy Ageing Program, which included 533 women and 467 men aged 65 years and older, in Australia, over 10 years. Logistic regression modeling was used to investigate the prevalence of dual sensory loss and the unmet needs for vision and hearing devices in older women (compared to men) over time, as well as its impacts on self-reported general health, depression, perceived social activities, community service use and ageing in place. Results suggested that the prevalence of dual sensory loss increased for women from the age of 75 years and over. Dual sensory loss was higher for older women and men who were living alone, with government benefits as their main income source or were divorced, separated or widowed. Dual sensory loss had significant impacts on poor general health, perceived inadequate social activities and community service use for women and men and on depression for women only. Early identification of dual sensory loss is essential to minimize its effects, ensuring continued well-being for this population.

Risk factors associated with congenital defects that alter hearing or vision in children born in the city of Bogotá between 2002 and 2016

INTRODUCTION

Congenital defects affecting the auditory and visual capacity of newborns represent a public health problem as they result in substantial disability, directly impacting the quality of life of newborns and their families.

OBJECTIVE

To evaluate risk factors associated with congenital defects that alter hearing or vision in newborns in the city of Bogotá between 2002 and 2016.

METHOD

Data from the Bogotá Birth Defects Surveillance and Follow-up Program was used, which consolidated data regarding 167 ECLAMC study (Estudio Colaborativo Latino Americano de Malformaciones Congénitas, in spanish) variables in a case-control design to identify risk factors for birth defects after parents provided signed informed consent. Cases were defined as any newborn (alive or stillborn) with a weight greater than 500 g with any visual or hearing abnormality. Controls were defined as newborn in the same hospital and month with no birth defects. Groups were formed according to the case presentation as follows: isolated eye anomaly, isolated ear anomaly, polymalformative, syndromic, and teratogenic.

RESULTS

In total, 402,657 births were reviewed, of which 968 cases had some congenital defects that alter hearing or vision. An association was found between the presence of defects and prematurity, as well as between syndromic cases and increasing maternal age. When comparing cases and controls with the risk of having a birth defect, multiparity had an odds ratio (OR) of 1.47 (95% CI: 1.27-1.71), acute respiratory infection had an OR of 2.41 (95% CI: 1.04-5.58), low maternal education level had an OR of 1.34 (95% CI:1.10-1.62), low paternal education had an OR of 1.42, (95% CI:1.17-1.73), manual labor in the maternal occupation had an OR of 1.31 (95% CI:1.03-1.67), and a history of congenital anomalies in the family had an OR of 1.55 (95% CI:1.19-2.00).

CONCLUSION

This research allowed the identification of epidemiological data and significant risk factors for congenital defects that alter hearing or vision in the population of Bogotá.

Communication development from an intersubjective perspective: Exploring the use of a layered communication model to describe communication development in students with congenital deafblindness

This exploratory study conducts a quantitative investigation on the communication development of students with congenital deafblindness (CDB). First, a layered communication model (LCM) is introduced, describing communicative behaviors based on three layers of intersubjective development for typically developing children (Bråten & Trevarthen, 2007). Subsequently, an analysis is made of how applicable the LCM is for children with CDB. Video recordings of four dyads of students with CDB with varying developmental ages and their teachers are coded using ten-second partial interval coding. The presence of LCM behaviors, the student and teacher contributions to communication, and the development over a half-year period are described and compared between dyads. The results reflected the developmental differences between dyads. At the primary layer, all behaviors occurred a comparable number of times between dyads, which confirms that this is a basic communication layer. Quantitative differences between dyads were encountered between and within the secondary and tertiary layers. Teacher contribution was higher for students with lower developmental ages compared to students with higher developmental ages. Also, teacher contribution was higher for the secondary and tertiary layer behaviors of the LCM compared to the primary layer behaviors. No increase was found in the behaviors over the half-year period. Results suggest that the LCM can be used to gain insight into the communication level of a dyad, hereby paving the way for intervention studies to improve communication development.

Using the ICF to Identify Contextual Factors That Influence Participation of Persons With Deafblindness

OBJECTIVE

To identify and describe the contextual factors that influence the participation of people with deafblindness in India.

DESIGN

Qualitative study, using directed content analysis approach and the International Classification of Functioning, Disability and Health (ICF) as a framework to analyze the data.

SETTING

Community and social participation settings.

PARTICIPANTS

Community-dwelling individuals with deafblindness (N=16). Age ranges from 18-45 years.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Personal and environmental factors that influence the participation of individuals with deafblindness using the ICF framework.

RESULTS

Results indicate that the age of onset and nature of impairment (deafblindness) and willingness to explain the condition (functional consequences of deafblindness) emerged as important personal factors. Access to resources such as assistive technology, social support, and deafblind-specific services were found to be enablers of participation. Lack of services, systems, and policies specific to deafblindness along with negative societal attitude toward disability were highly perceived environmental barriers that influence participation of people with deafblindness in India.

CONCLUSIONS

Professionals must acknowledge aspects of the environment in conducting assessments and delivering interventions and understand the dynamic interactions between environment of the individual and his/her concurrent vision and hearing impairments. Approaches to enable participation require rehabilitation professionals to work with those with deafblindness to advocate for removal of environmental barriers and ensure provision of appropriate resources from the government to facilitate their participation. Social policy and government must ensure emphasis on awareness about deafblindness, access to deafblind-specific services, positive societal attitude, and opportunities for full participation for people with deafblindness in society.

Meaning and experiences of participation: a phenomenological study with persons with deafblindness in India

Purpose: Deafblindness, also known as dual sensory loss, creates a distinct condition more disabling than either deafness or blindness alone. The participation experiences of persons with deafblindness have not been understood well. This phenomenological study aims to understand the meanings of participation for persons with deafblindness and identify the domains of life that are important to them.Methods: We used the International Classification of Functioning, Disability and Health as a guiding framework. Sixteen adults with deafblindness were interviewed between March and May 2017 in India using a qualitative interview guide.Results: Findings suggest participation as a dynamic, individualized construct that is not just an end outcome. Rather, it is a means to achieve other goals important to the participants such as gaining respect, autonomy, independence, support and relationships, to fulfill aspirations and responsibilities, and to feel included and recognized in society. Life domains that they deemed important for participation were communication and access to information, mobility, relationships, education and productivity, and recreation and leisure.Conclusions: In order to enhance societal participation of people with deafblindness, a significant change in the focus of rehabilitation services is required which involves professionals viewing participation as both a means and an end outcome while designing interventions.

Overcoming barriers to the involvement of deafblind people in conversations about research: recommendations from individuals with Usher syndrome

PLAIN ENGLISH SUMMARY

Usher syndrome is the most common cause of deafblindness worldwide and is estimated to affect between 3 and 6 people in every 100,000. Children are born with hearing loss and develop sight loss in their early years of life. A barrier to the involvement and participation of deafblind people in research is access to information in appropriate formats. The degree of sight and hearing impairment experienced by individuals is variable, so there is not a one size fits all solution. We held a research discussion group, that included five people with Usher syndrome, to consider people's accessibility needs for an upcoming research project involving this condition.We have identified a number of considerations for including deafblind people in conversations about research: i) using appropriately sized meeting rooms which offer control over lighting, layout and sound; ii) where appropriate, ensuring written/printed materials are high contrast (e.g. black text with a yellow background) and in large (18 point and above), sans-serif fonts (e.g. Arial); iii) identifying the relevant communication support for the individual whether that be sign language interpretation, lip reading, hearing loop, speech to text reporting or a combination; iv) ensuring that there is access to emotional support for both people who are deafblind and their families before, during and after the research.The outcome of this work is a checklist of considerations when planning to hold a research conversation with someone who is deafblind and hinges on earlier interactions to identify the appropriate support needs for the individual.

ABSTRACT

Background Usher syndrome is the most common cause of deafblindness worldwide. Children are born with hearing loss and develop sight loss in their early years of life. It is estimated to affect between 3 and 6 people in every 100,000. A barrier to the involvement and participation of deafblind people in research is access to information in appropriate formats. Individuals have varying degrees of sight and hearing impairment meaning there is not a singular solution to supporting all people's communication needs. There is evidence that severe sight and hearing impairments are used as exclusion criteria in some research studies. This exclusion may extend into involvement activities. Methods Eight people, including five people with Usher syndrome, attended a research discussion group. Through this activity, we identified what to consider when looking to improve the experience of taking part in a discussion about research for deafblind individuals. Results Among contributors two people made use of standard British Sign Language interpretation and one communicated using hands-on signing. Contributors highlighted the limitations associated with signing and lip reading such as exhaustion and clear lines of sight as well as the need for additional formats such as speech to text reporting, and high contrast (e.g. black text with a yellow background) printouts with large (18 point and above), sans-serif fonts (e.g. Arial). A large proportion of discussions were on the importance of wrap around emotional support for people who are deafblind and their family throughout the research pathway. This includes counselling, peer support and sensitive and mindful facilitators of involvement activities. Conclusions The range and specific nature of the communication methods and support offerings that deafblind people depend on are broad and require researchers and involvement practitioners to reach out to deafblind contributors earlier on, in order to appropriately tailor approaches and put the most suitable support in place. Informed by this discussion group, we have developed a checklist of key considerations to support the inclusion of deafblind individuals in research conversations, supplemented with input from the sensory disability charity Sense.

Participation experiences of people with deafblindness or dual sensory loss: A scoping review of global deafblind literature

BACKGROUND

Deafblindness, also known as dual sensory loss, is a varying combination of visual and hearing impairment in the same individual. Interest in this topic has increased recently due to evidence suggesting an increase in prevalence of this condition among older adults. Persons with deafblindness frequently experience participation barriers and social isolation. Developing an understanding of their experiences can inform the design of programs and policies to enhance participation of people with deafblindness in society.

OBJECTIVE

To identify and summarize available research literature on participation experiences of people with deafblindness or dual sensory loss.

METHODS

A comprehensive literature search of eight databases (CINAHL/EBSCO, Embase, ERIC, Global Health, MEDLINE, ProQuest, PsycINFO, PubMed) was performed in accordance with the Preferred Reporting Items for Systematic Reviews (PRISMA) during January 2017 and last updated in June 2017. In addition, non-peer reviewed (grey) literature was also retrieved in the form of online published reports of research projects by 16 deafblind-specific organizations across the globe. To be included, sources had to be published after 1990, had persons with deafblindness as the focal population, and focused on their participation experiences.

RESULTS

A total 1172 sources were identified of which 54 studies were included. The findings reveal that persons with deafblindness, regardless of origin of their impairment, experience difficulty in communication, mobility, daily living functioning, and social interactions. While these experiences may vary between individuals with congenital versus acquired conditions, they generally feel socially isolated, insecure and uncertain about their future.

CONCLUSION

Participation experiences of persons with deafblindness are shaped by dynamic interactions between personal factors (such as onset and type of impairments) and environmental influences (such as attitude, technology, and supports). A better understanding of participation experiences may help professionals in placing emphasis on affected participation domains to design services to enhance participation of people with deafblindness.

Aetiologies of acquired deafblindness in a national sample

The present study provides an overview of aetiologies and co-morbidities of acquired deafblindness in a Danish national sample of 514 individuals above 50 years of age identified with acquired deafblindness. Information was obtained from a survey and a register. The most frequent aetiology of vision loss was age-related macular degeneration (55.4%). The most frequent aetiology of hearing loss was presbycusis (53.7%). The most frequent aetiology of acquired deafblindness was the combination of age-related macular degeneration and presbycusis (41.5%). However, among the younger participants (50–59 years of age), Usher syndrome was the most common aetiology (62.5%). The aetiologies of acquired deafblindness are many and constituted by several different combinations of hearing and vision loss aetiologies. The most frequent aetiologies are age related.

A relationship-focused investigation of spousal psychological adjustment to dual-sensory loss

OBJECTIVES

The relationship intimacy model of psychosocial adjustment to illness indicates that a patient's willingness to communicate about their illness, as perceived by the spouse, is a strong predictor of spouse relational and psychological well-being. Inspired by the relationship intimacy model, the current study examined the psychological adjustment of spouses of individuals with dual-sensory loss (DSL), a disability where interpersonal communication is of particular concern.

METHOD

Surveys were sent to all known individuals and their partners who were 50 years of age or older and were enrolled in services for acquired DSL in Denmark. A total of 65 spouses met the inclusion criteria of which 45 (69%) returned a partner survey.

RESULTS

Results showed a significant association between couples' sensory loss-related communication, relationship satisfaction, perceived support and psychological well-being. Perceived support significantly mediated the association between couples' sensory loss communication and spouse psychological well-being.

CONCLUSION

The current study's findings provide support for a relationship-focused perspective of spousal psychological adjustment in the context of DSL. Further, couples' sensory loss-related communication is presented as a potential intervention target to enhance spouse perceived support and psychological well-being.

Assessment of Dementia in Individuals with Dual Sensory Loss: Application of a Tactile Test Battery

Background/Aims

Individuals with dual sensory loss (DSL) are more likely to experience cognitive decline with age than individuals without sensory loss. Other studies have pointed to the challenges in assessing cognitive abilities in individuals with DSL, as most existing instruments rely on use of vision and hearing. The aim of this study was to develop and evaluate a Tactile Test Battery (TTB) for cognitive assessment in individuals with DSL.

Method

Twenty elderly individuals with DSL, 20 with diagnosed dementia, and 20 without dementia or DSL (controls) completed the following tactile tests developed for the present study: Spatial learning, Spatial recall, Tactile form board, Clock reading, and Naming. The participants with dementia and controls also completed the Mini-Mental State Examination (MMSE).

Results

Overall, participants with dementia performed significantly worse on the tactile tests than participants with DSL and control participants. No significant differences on the tactile tests were found between participants with DSL and controls. The TTB and MMSE scores correlated significantly.

Conclusion

The findings from this study of applying tactile tests for cognitive examination in individuals with DSL are promising. They indicate that symptoms of dementia can be differentiated from symptoms related to DSL.