[Ocular prosthetics. Fitting, daily use and complications]

[Evisceration, enucleation and exenteration-Indications, techniques, and postoperative care]

Various surgical techniques are available for the extirpation of an eye, depending on the underlying disease. Typical indications encompass tumors, inflammatory and infectious processes, glaucoma, trauma as well as congenital malformations. Surgical procedures include evisceration (resection of the intraocular space with preservation of the sclera), enucleation (extirpation of the entire eyeball including sclera and cornea) and exenteration (resection of the complete orbital soft tissue). The early detection of postoperatively manifesting complications, such as implant extrusion, conjunctivitis, postenucleation socket syndrome as well as the development of enophthalmus or ptosis, is of particular relevance in the context of postoperative care regarding functional, esthetic and social outcome. Special attention must be paid to ensuring a complication-free rehabilitation process, including the supply of a suitable, precisely fitting prosthesis or epithesis. This ensures the patient's psychosocial reintegration, in which an integrated interdisciplinary cooperation with ocularists and psychologists is essential. The latter play a particularly important role, as the psychological stress resulting from the procedure is often associated with a considerable reduction in the quality of life.

[Complications of anophthalmic orbits-Treatment and aftercare]

The possible complications of anophthalmic eye sockets can occur due to many different pathomechanisms. A differentiation is made between allergic, infectious, inflammatory or mechanical causes. This article gives an overview on the different etiologies of socket complications with their pathophysiology and treatment options.

Conjunctival sac microbiome in anophthalmic patients: Flora diversity and the impact of ocular prosthesis materials

Purpose

To explore the changes of bacterial flora in anophthalmic patients wearing ocular prosthesis (OP) and the microbiome diversity in conditions of different OP materials.

Methods

A cross-sectional clinical study was conducted, involving 19 OP patients and 23 healthy subjects. Samples were collected from the upper, lower palpebral, caruncle, and fornix conjunctiva. 16S rRNA sequencing was applied to identify the bacterial flora in the samples. The eye comfort of each OP patient was determined by a questionnaire. In addition, demographics information of each participant was also collected.

Results

The diversity and richness of ocular flora in OP patients were significantly higher than that in healthy subjects. The results of flora species analysis also indicated that in OP patients, pathogenic microorganisms such as Escherichia Shigella and Fusobacterium increased significantly, while the resident flora of Lactobacillus and Lactococcus decreased significantly. Within the self-comparison of OP patients, compared with Polymethyl Methacrylate (PMMA), prosthetic material of glass will lead to the increased colonization of opportunistic pathogens such as Alcaligenes, Dermabacter and Spirochaetes, while gender and age have no significant impact on ocular flora.

Conclusions

The ocular flora of OP patients was significantly different from that of healthy people. Abundant colonization of pathogenic microorganisms may have an important potential relationship with eye discomfort and eye diseases of OP patients. PMMA, as an artificial eye material, demonstrated potential advantages in reducing the colonization of opportunistic pathogens.

Comparison of computed tomographic ocular biometry in brachycephalic and non-brachycephalic cats

Background and Aim:

Ocular biometry has been used to evaluate ocular parameters; however, several factors need to be considered. In humans, age and sex have been shown to affect ocular biometry. The main factor that affects feline ocular biometry is the head circumference. At present, several reports have revealed that canine ocular biometry differs among dog breeds. However, there are no reports on normal ocular biometry in cats using computed tomography (CT). Therefore, this study aimed to explore feline ocular parameters between brachycephalic (B) and non-brachycephalic (NB) cats using CT and to evaluate the influence of age or sex of cats on ocular biometry.

Materials and Methods:

Twenty-four normal cats were divided into two groups: B (n=12) and NB (n=12). Each group had an equal number of designated males and females. CT was performed under mechanical restraint without general anesthesia and intravenous contrast enhancement. Ocular biometry, dimensions of the internal structure, including attenuation numbers and extra-ocular structures, were evaluated and compared.

Results:

B-cats had a significantly wider globe width (GW) than NB-cats (p<0.05). In addition, globe length (GL) and GW were significantly correlated with the age of the cats. Significant correlation between GL and age was observed in all cats (r=0.4867; p<0.05), NB-cats (r=0.8692; p<0.05), and B-cats (r=0.4367; p<0.05), whereas the correlation between GW and age was observed in B-cats only (r=0.7251; p<0.05). For extra-ocular structures, NB-cats had significantly greater orbital depth than B-cats (p<0.05), and orbital diameter was significantly correlated with age in all cats and B-cats (p<0.05).

Conclusion:

CT can be used for ocular biometric evaluation in cats with different skull types. GW was wider in B-cats, whereas the orbital depth was greater in NB-cats. Moreover, GW, GL, and orbital diameter were affected by the age of the cats. This information will be useful for further ocular diagnosis and treatment, especially in prosthetic surgical procedures.

Dry anophthalmic socket syndrome - morphological alterations in meibomian glands

Purpose

To evaluate morphological alterations of meibomian glands (MGs) in the dry anophthalmic socket syndrome (DASS).

Methods

Fifteen unilateral anophthalmic patients wearing cryolite glass prosthetic eyes were enrolled. All patients with clinical blepharitis or other significant eyelid abnormalities were excluded. In vivo laser scanning confocal microscopy (LSCM) of the MGs in the lower eyelids both on the anophthalmic side and the healthy fellow eye was performed to quantify acinar unit density, acinar unit diameter, acinar unit area, meibum secretion reflectivity, the inhomogeneous appearance of the glandular interstice, and inhomogeneous appearance of the acinar walls.

Results

The lower eyelids of the anophthalmic sockets revealed a significant reduction of the acinar unit density (p = 0.003) as well as a significantly more inhomogeneous appearance of the periglandular interstices (p = 0.018) and the acinar unit walls (p = 0.015) than the healthy fellow eyelid. However, there were no significant differences regarding the acinar unit diameter, acinar unit area, and meibum secretion reflectivity of the MGs on the anophthalmic side compared to the healthy fellow eyelid (p ≥ 0.05, respectively).

Conclusions

The eyelids of anophthalmic sockets without clinical blepharitis demonstrate a reduced density of MG acinar units and a more inhomogeneous appearance of the periglandular interstices and the acinar unit walls. This can cause meibomian gland dysfunction contributing to DASS and suggests early treatment of these symptomatic patients, even in the clinical absence of any blepharitis signs.

Keratopigmentation combined with strabismus surgery to restore cosmesis in eyes with disabling corneal scarring and squint

BACKGROUND

Therapeutic corneal pigmentation has modernly evolved into different sophisticated techniques to camouflage cosmetically disabling corneal opacities and scars with good reported outcomes. Blind eyes frequently suffer from strabismus which further deteriorates the cosmesis of the patient. Combined keratopigmentation (KTPG) with strabismus surgery may be an option for these patients.

METHODS

A total of 72 consecutive patients were retrospectively reviewed in this investigation. Main outcome measures were postoperative residual squint, and cosmesis evaluated by an independent observer, patient satisfaction, reoperation rates for KTPG and squint, and complications.

RESULTS

A total of 72 consecutive patients and 73 eyes that underwent KTPG and strabismus surgery were included in this study. Mean follow-up time was 2.5±3 years. Patient age ranged from 5 to 83 years, with 93% having visual acuity worse than 0.1. 14 eyes (24.5%) underwent repeated KTPG, 24 (42.1%) had repeated strabismus surgery. 14 patients (19.4%) had a repeat muscle surgery, although 55 (76.4%) of the 72 patients achieved orthotropia or had deviations within 10 prism dioptres at the end of the follow-up period. Corneal microperforation was encountered in two (2.8%) patients and conjunctival staining in 10 eyes. Cosmesis was good for all patients. Patients who required repeat KTPG or strabismus surgery, or those in whom orthotropia was not totally restored, considered their cosmetic appearance sufficiently improved.

CONCLUSION

Corneal KTPG combined with strabismus surgery provides good cosmesis for patients with corneal scarring and strabismus with minimal complications. Reoperation rates are relatively high in the short term to accomplish an optimal cosmetic result.

Cryolite glass prosthetic eyes-the response of the anophthalmic socket

PURPOSE

To investigate mucoid discharge and the inflammatory response of anophthalmic sockets to cryolite glass prosthetic eye wear.

PATIENTS AND METHODS

A total of 101 cryolite glass prosthetic eye wearers used visual analog scales (0-10) to measure frequency, color, volume, and viscosity of mucoid discharge associated with their prosthesis. Standardized photographs of the conjunctiva of their anophthalmic sockets were taken and conjunctival inflammation was semi-quantitatively graded (0-4). All characteristics of discharge and conjunctival inflammation were correlated to eye loss cause, hand washing behavior, and cleaning regimes as explanatory variables.

RESULTS

Mean mucoid discharge characteristics (0-10 scale) were frequency 5.3 ± 2.8, color 4.8 ± 3.2, volume 4.9 ± 3.0, and viscosity 5.1 ± 3.2. The mean conjunctival inflammation score (0-4 scale) was 2.1 ± 1.0. There was a positive correlation between the grade of conjunctival inflammation and the frequency (p = 0.018), color (p = 0.001), volume (p = 0.003), and the viscosity of mucoid discharge (p = 0.005). More conjunctival inflammation was associated with higher frequency of cleaning (p < 0.001) and lower frequency of hand washing before removal (p = 0.001). Higher frequency, color, volume, and viscosity of discharge were associated with higher frequency of cleaning (p ≤ 0.001).

CONCLUSIONS

Discharge severity associated with prosthetic eye wear was positively correlated with more conjunctival inflammation, higher cleaning frequency, and less hand washing before handling. The results suggest that cryolite glass eyes should not be removed daily for cleaning and that further research should be undertaken to develop a standardized treatment protocol for managing inflammation and mucoid discharge. This protocol would advise hand washing before handling cryolite glass eyes and recommend a minimum period of wear between cleaning sessions.

Concerns of Anophthalmic Patients Wearing Cryolite Glass Prosthetic Eyes

PURPOSE

To identify the main concerns of patients experienced in wearing cryolite glass prosthetic eyes and to investigate how these have changed over time.

METHODS

One hundred six patients experienced in wearing prosthetic eyes for at least 2 years were asked to complete an anonymous questionnaire regarding prosthetic eye concerns at the time of initial eye loss and at the present time. Main outcome measures included changes in levels of concern over time.

RESULTS

Initially, the participants were mainly concerned about their appearance, health of the fellow eye, and coping with monocularity. Over time, there was a significant increase of the level of concern regarding the health of the remaining eye (p < 0.001) and regarding watering, crusting, and discharge (p < 0.001). Loss of balance did not change significantly (p = 0.302). All other concerns decreased significantly over time (p < 0.001), with levels of concern about appearance decreasing the most. The current leading concern was the health of the remaining eye followed by concerns about watering, crusting, and discharge. Length of time since natural eye loss was the most important explanatory variable, with significant impact on the concerns about appearance (p = 0.013), retention of the prosthetic eye (p = 0.002), and eyelid contour (p = 0.004).

CONCLUSIONS

Health of the remaining eye is the most common current concern of anophthalmic patients, acknowledging the need of good ophthalmologic follow up after losing an eye. The second most important concern is with watering, crusting, and discharge, suggesting further research for establishing an evidence-based protocol for cryolite glass prosthetic eye maintenance and supportive treatment.

Concerns of anophthalmic patients-a comparison between cryolite glass and polymethyl methacrylate prosthetic eye wearers

PURPOSE

To compare the concerns of experienced cryolite glass and (poly)methyl methacrylate (PMMA) prosthetic eye wearers.

METHODS

One hundred six experienced cryolite glass and 63 experienced PMMA prosthetic eye wearers completed an anonymous questionnaire regarding general and specific prosthetic eye concerns at least 2 years after natural eye loss. From these independent anophthalmic populations, we identified 34 case-control pairs matched for the known influencing demographic variables of gender, occupation, age, and time since natural eye loss.

RESULTS

The levels of concern were significantly lower in the cryolite glass group than those in the PMMA group for the following: loss of balance (p < 0.001), phantom sight vision (p < 0.001), pain (p < 0.001), receiving good advice (p = 0.001), fullness of orbit (p = 0.001), size (p = 0.007), direction of gaze relative to the healthy fellow eye (p = 0.005), eye lid contour (p = 0.037), comfort of the prosthetic eye (p < 0.001), colour relative to the healthy fellow eye (p < 0.001), and retention of the prosthetic eye (p < 0.001). Concerns about watering, crusting, discharge, visual perception, appearance, movement of the prosthetic eye, and health of the remaining eye were not significantly different between both groups.

CONCLUSIONS

The results of this study showed that many general and specific levels of concern were significantly lower for cryolite glass prosthetic eye wearers than for PMMA prosthetic eye wearers. The question of why there are significant differences and to what extent the material of the prosthesis (cryolite glass or PMMA) has an impact on various concerns remains unanswered and should be addressed in a prospective comparative multicentre trial.

The Role of Prosthesis Spacer for Ocular Prostheses

Eye defects can lead to emotional, psychological, and social changes, impacting negatively the quality of life of the patient. When these structures cannot be satisfactorily repaired by reconstructive surgery, the prosthetic rehabilitation is the better treatment option to restore lost ocular anatomy and promote the social integration of the individual. The aim of this clinical report is to report and discuss a case of ocular prosthesis confection eviscerated patient with opening limitation eyelid and shortening of the distance between palpebral commissure, to obtain a more natural and comfortable to the patient ocular rehabilitation.