Ocular siderosis: a misdiagnosed cause of visual loss due to ferrous intraocular foreign bodies-epidemiology, pathogenesis, clinical signs, imaging and available treatment options

Clinical findings and management of intraocular foreign bodies (IOFB) in third-world country eye hospital

PURPOSE

To describe the demoFigurey and clinical characteristics of intraocular foreign body as open globe injury type at National Eye Center Cicendo Eye Hospital.

METHODS

This descriptive-retrospective study is based on medical records of patients admitted to National Eye Center Cicendo Eye Hospital diagnosed with intraocular foreign bodies from January 2019 to June 2023.

RESULTS

A total of twenty-one cases of ocular trauma specifically intraocular foreign bodies were recorded based on medical records. A total of 20 cases (95.2%) were male. The incidence of 15 cases (71.4%) of trauma in outdoor activities with the whole mechanism (100%) of penetrations. Most cases were referred cases (57.1%). 11 cases had surgery under 24 h prior to trauma (52.4%). The entry site of the foreign body was on the cornea (17 cases, 81%). Metallic foreign bodies account for 16 (76.2%); most locations are found on the retina (71.4%). More than three fourths of patients had single IOFB (76.2%). Visual acuity is mostly present between counting fingers- 0.1 Snellen. Patients showed to have had retinal breaks (61.9%).

CONCLUSION

The majority of IOFB patients were working-age males. The nature of IOFBs is mostly metallic and retained in the posterior segment.

An Unusual Case of Low Vision and Anisocoria Considered a Neurological Finding in the Emergency Department: Ocular Siderosis

We present the case of a patient who came to the emergency department with a significant decrease in vision and dilated pupil in the left eye. Since neurological pathologies were primarily considered, diffusion brain magnetic resonance imaging (MRI) and brain computed tomography (CT) were requested. After the results were reported as normal, we were consulted. On examination, the anterior segment was normal but we detected shiny pearl-like formations in the anterior vitreous, condensation at the inferior of the posterior vitreous, and a scar in the macula. When we evaluated the orbital section of the current brain CT, we detected an intraocular foreign body (IOFB). On the brain MRI, we saw a large artifact that obscured the left orbit and surrounding anatomical structures. When we questioned again, we learned that he had been admitted to another emergency department two months prior due to an object hitting his left eye, where the eye was only washed with saline. Our case emphasizes that ocular siderosis caused by IOFBs should be kept in mind in the differential diagnosis of anisocoria, especially before MRI. Because metallic objects may move during MRI, undiagnosed IOFBs can cause serious ocular side effects.

An unexpected retained metallic intraocular foreign body

PURPOSE

This case report aims to describe a rare case of asymptomatic retained metallic intraocular foreign body (IOFB) in the retina with reduced full-field electroretinography (ff-ERG) in a Chinese woman.

METHODS

This is a clinical investigation of a patient who unexpectedly presented with a metallic IOFB at the superior-temporal region of the left eye ring during a brain computed tomography.

RESULTS

Her best-corrected visual acuity was 20/20 in both eyes. The dilated fundus photograph of the left eye revealed a metallic IOFB in the retina. She reported no ocular symptoms. A diagnosis of asymptomatic metallic IOFB was made definitely. The subsequent ff-ERG demonstrated subnormal amplitudes of dark and light adaption in the left eye, whereas responses were normal in the right eye.

CONCLUSIONS

Our findings suggest the application of ff-ERG has important benefits for evaluating the visual function in patients with retained IOFB.

Magnetized forceps for intraocular foreign body removal: which one is suitable?

INTRODUCTION

Magnetic intraocular foreign bodies can be removed with magnetized disposable forceps. Aim of this study is to compare the forceps magnetizability of different size, form and manufacturer.

METHODS

The forceps were magnetized using an established procedure. The inducible magnetic flux density was measured at the tip of the forceps. The mass that can be lifted with the magnetized forceps was then tested using steel balls in BSS solution. The weight of the metal parts of the forceps was measured.

RESULTS

The magnetic flux density that could be induced, the weight of the steel balls that could be lifted and the mass of stainless steel used in the forceps were as follows: Alcon end-grasping 23G: 7.12 mT, 87.43 mg, 1191 mg; Alcon end-grasping 25G: 6.43 mT, 87.43 mg, 1189 mg; Alcon serrated: 4.39 mT, 63.78 mg, 1284 mg; Alcon serrated 23G: 3.62 mT, 13.74 mg, 1200 mg; Alcon serrated 25G: 2.4 mT, 13.74 mg, 1195 mg; DORC end-grasping 23G: 5.52 mT, 32.54 mg, 153 mg; Synergetics end-grasping 23G: 4.35 mT, 16.37 mg, 193 mg; Vitreq BV end-grasping 23G: 2.65 mT, none, 88 mg.

DISCUSSION

The magnetizability of a disposable microforceps seems to depend on the mass of steel at the tip of the forceps. The structure of the iron lattice could have an even greater influence. Not every disposable forceps can be sufficiently magnetized for this technique.

Advances in the management of intraocular foreign bodies

Intraocular foreign bodies (IOFBs) remain a severe complication of ocular trauma commonly encountered worldwide. This literature review aimed to discuss current practice patterns, areas of controversy, and advances in the management of IOFBs. Injuries involving IOFBs carry significant ocular morbidity and management can be extremely challenging. A systematic approach to preoperative evaluation and IOFB surgical management is detailed in this article and should be applied in each case. The location and composition of an IOFB have important implications on surgical approach and timing, especially in cases of toxic metals and vegetable matter. The advantages, disadvantages, and previous literature regarding immediate versus delayed foreign body removal are presented. Surgical approaches are described, with an emphasis on posterior chamber IOFB management and removal via pars plana vitrectomy. Final visual acuity is variable, but approaches have been used to prognosticate outcomes including the Ocular Trauma Score. By synthesizing current IOFB literature, the goal is to provide practitioners with guidance that will maximize the chances of surgical success and patient outcomes.

Demystifying the role of magnetic resonance in identifying intraocular foreign bodies: a case of ocular siderosis

BACKGROUND

Ocular siderosis (OS) is a significant cause of visual loss due to retained ferrous intraocular foreign bodies (IOFB). Despite its rarity, OS can lead to severe visual impairment if not promptly diagnosed and treated. This case is notable due to the occult nature of the IOFB, which was undetected by standard imaging modalities, emphasizing the critical role of magnetic resonance imaging (MRI) in such scenarios.

CASE PRESENTATION

A 51-year-old Caucasian male presented with progressive vision loss in his right eye over 20 days. Best corrected visual acuity (BCVA) was 20/1000 in the right eye and 20/20 in the left eye. Intraocular pressure (IOP) was 9 mmHg in both eyes. Slit-lamp examination revealed a small linear corneal wound and an iris defect in the right eye, along with a cataract featuring brownish deposits on the anterior capsule. The left eye was normal. Fundus examination of the right eye was hindered by media opacities. Ultrasonography showed a flat retina and choroid with no detectable IOFB. Despite a strong clinical suspicion of OS, computed tomography (CT) did not detect any IOFB. MRI subsequently identified an artifact in the inferior sectors of the right eye, indicative of a metallic IOFB. Surgical intervention involved a 23-gauge vitrectomy, phacoemulsification, IOFB removal and silicon oil (SO) tamponade resulting in a fully restored VA of 20/20 and normal IOP one month post-operation. SO was removed 2 months later. The retina remained adherent with no PVR development, and optical coherence tomography (OCT) scans showed a normal macula.

CONCLUSIONS

This case underscores the importance of considering OS in patients with unexplained vision loss and history of ocular trauma, even when initial imaging fails to detect an IOFB. MRI proved crucial in identifying the IOFB, highlighting its value in the diagnostic process. Early detection and surgical removal of IOFBs are essential to prevent irreversible visual damage. This case demonstrates that MRI should be employed when CT and ultrasonography are inconclusive, ensuring accurate diagnosis and timely intervention to preserve vision.

Management and Clinical Outcomes of Eyes With Posterior Segment Intraocular Foreign Bodies Seen at a Tertiary Referral Center

BACKGROUND AND OBJECTIVE

This study aimed to identify the prognostic factors regarding the visual and anatomic outcomes of eyes with posterior segment intraocular foreign body (PS-IOFB).

PATIENTS AND METHODS

The medical records of 95 patients who underwent pars plana vitrectomy and PS-IOFB removal between 2004 and 2021 were retrospectively reviewed. Data on anatomical and visual outcomes, as well as preoperative, intraoperative, and postoperative variables were statistically analyzed.

RESULTS

The mean age of the patients was 31.9 ± 12.3 years. The mean follow-up time was 21.9 ± 28.3 months. The median time interval from trauma to IOFB removal was 9 days. In univariate analysis, there was a positive correlation between initial visual acuity (VA) and final VA (P < 0.001). A higher ocular trauma score (OTS) was significantly associated with both anatomical and functional success (P < 0.001). Linear regression analysis showed that OTS was not superior to initial VA in predicting final VA (r = 0.625 vs r = -0.601). Anatomic and functional outcomes were not affected by the injury site, nature of PS-IOFB, or timing of PS-IOFB removal (P > 0.05 for all). Subretinal IOFB location, the need for silicone oil tamponade, and endophthalmitis (P = 0.005, P < 0.001, P = 0.044, respectively) were risk factors for poor visual outcome.

CONCLUSIONS

The initial VA, the extent of the initial ocular damage, and the presence of endophthalmitis are important prognostic factors for functional success. [Ophthalmic Surg Lasers Imaging Retina 2024;55:434-442.].

Intraocular foreign bodies in children: A retrospective case series

INTRODUCTION

Open globe injuries are a major cause of visual impairment in children, related to the severity of the trauma or secondary to induced amblyopia. Intraocular foreign bodies (IOFB) have been reported in approximately one third of cases of open globe injuries. As clinical presentation and management may differ between adults and children, data is lacking about IOFBs in children under 18years of age. The purpose of this study was to assess the clinical characteristics and visual prognosis of ocular trauma associated with intraocular foreign bodies in children.

MATERIALS AND METHODS

This single-center retrospective study included patients under 18years of age treated for ocular trauma with IOFB. Demographic characteristics, complete initial and final ophthalmological examination, imaging data and details of medical and surgical management were collected.

RESULTS

Fourteen patients were included (78.6% boys), with a mean age of 10.3years (min 7months-max 17years). In 92.9% of cases, patients were found to have a single IOFB, mostly metallic (71.4%). Posterior segment IOFBs were found in 50% of cases, anterior segment IOFBs in 28.6% and orbital IOFBs in 21.4%. The clinical examination permitted detection of the IOFBs in 50% of cases, while they were visible on CT scan in all cases. The mean initial visual acuity was 20/320, and the mean final visual acuity was 20/125. Endophthalmitis occurred in 2 cases (14%).

DISCUSSION

Open globe injuries associated with IOFB are severe and sight-threatening. Localization of the IOFB in the posterior segment has a worse prognosis. CT scan is mandatory, especially in children, as the trauma history is often missing. Retinal detachment and endophthalmitis appear to be the main prognostic factors requiring urgent specialized pediatric ophthalmology management.

Double Reverse Overlapping Scleral Trapdoor (DROST) Technique for the Removal of Juxtalenticular Intraocular Foreign Body

We describe the double reverse overlapping scleral trapdoor (DROST) technique, a novel minimally invasive technique for the removal of very anterior intraocular foreign bodies without the need of pars plana vitrectomy. [Ophthalmic Surg Lasers Imaging Retina 2023;54:600-602.].

Retained Intraocular Iron Foreign Body Leading to Late-Onset Siderotic Glaucoma: A Challenging Case Report

BACKGROUND A retained ferrous intraocular foreign body (IOFB), introduced via penetrating ocular trauma, may result in ocular siderosis and visual loss that may occur after days or years. If diagnosis is delayed, therapy may also be delayed, resulting in a poor outcome. The present report presents the case of a 58-year-old man with a retained iron IOFB and late-onset siderotic glaucoma 1 month after the initial trauma. CASE REPORT A 58-year-old man presented with redness and eye pain in the right eye for 1 month after ocular trauma. His visual acuity was very good, with no sign of eye strain. High intraocular pressure had been detected for several weeks, but the B-scan ultrasound and fundus examination were normal and the reason for the high intraocular pressure was unknown. He was later transferred to our senior hospital. The diagnosis of IOFB was confirmed by computed tomography (CT) scan and ultrasound biomicroscopy (UBM). The patient was successfully managed by vitrectomy. CONCLUSIONS This report highlights that a retained IOFB can be challenging to diagnose and that cases associated with siderotic glaucoma require multiple investigations. Early detection of the IOFB using the right tools is vital to reduce the risk of siderotic glaucoma. Although the fundus examination was normal after ocular trauma, the use of CT scan and UBM assisted in finding the IFOB and the patient was successfully treated by vitrectomy.

NOVEL TECHNIQUE FOR INTRAOCULAR FOREIGN BODY REMOVAL: Magnetized Disposable Microforceps. A Systematic Approach and First Clinical Result

PURPOSE

To verify whether disposable microforceps can be magnetized to atraumatically attract and then grasp intraocular foreign bodies. An effective magnetization protocol was developed. The clinical relevance was tested, and a first practical application was performed.

METHODS

The magnetic flux density (MFD) of a bar magnet and an electromagnet was measured. Steel screws were used to determine the magnetization protocol. Disposable microforceps was magnetized, MFD generated at the tip was measured, and the weight that can be lifted was tested. Foreign body removal with such forceps was performed.

RESULTS

The electromagnet MFD was much higher than the bar magnet. The most effective magnetization protocol was to pass the screw from the end along the shaft and back over the electromagnet. Magnetized microforceps had a 7.12 mT change in MFD at the tip. Steel balls up to 87 mg could be lifted in buffered saline solution. In clinical use, the intraocular foreign body could be attracted and grasped safely.

CONCLUSION

Disposable microforceps can be easily and inexpensively magnetized. The achievable MFD is clinically relevant to attract typical intraocular foreign bodies. An electromagnet is best suited for this purpose. With such prepared forceps, foreign bodies can be attracted atraumatically and grasped securely.

Low ceruloplasmin levels exacerbate retinal degeneration in a hereditary hemochromatosis model

In a previous report, a 39-year-old patient with high serum iron levels from hereditary hemochromatosis (HH) was diagnosed with a form of retinal degeneration called bull's eye maculopathy. This is atypical for patients with HH, so it was theorized that the low serum levels of ferroxidase ceruloplasmin (CP) of this patient coupled with the high iron levels led to the retinal degeneration. CP, by oxidizing iron from its ferrous to ferric form, helps prevent the oxidative damage caused by ferrous iron. To test this, a hepcidin knockout (KO) mouse model of HH was combined with Cp KO to test whether the combination would lead to more severe retinal degeneration. Monthly in vivo retinal images were acquired and, after 11 months, mice were euthanized for further analyses. Both heterozygous and homozygous Cp KO increased the rate and severity of retinal degeneration. These results demonstrate the protective role of CP, which is most likely owing to its ferroxidase activity. The findings suggest that CP levels may influence the severity of retinal degeneration, especially in individuals with high serum iron.

Case report: Bilateral eye injuries in members of one family due to a cluster munition in Ukraine

The aim of the study was to report the effects of surgical treatment of three victims of a cluster munition in Ukraine. A 32-year-old woman and her sons-6-year-old male twins-presented in Poland after 18 days of delay in treatment. All ocular injuries were bilateral. One of the boys presented with total retinal detachment and a post-traumatic cataract as well as corneal sutures in one eye and a post-traumatic cataract in the other eye. The other boy had already developed atrophy in one eye and a vitreous hemorrhage in the other eye. The woman suffered from bilateral post-traumatic cataract with multiple glass intraocular foreign bodies (IOFBs). The surgical treatment included cataract surgery with intraocular lens implantation in three eyes, removal of IOFBs in one eye, and enucleation of the atrophic eye with implantation of an ocular prosthesis preventing constriction of face tissues. The eye with retinal detachment underwent pars plana vitrectomy, and the vitreous hemorrhage resolved itself. Postoperatively, visual acuity improved significantly in four of six eyes. Only in the eye with an open-globe injury and persistent retinal detachment, the final visual acuity was still poor. In conclusion, cluster munition may lead to bilateral ocular trauma with IOFBs, open-and close-globe injuries, and severe vision loss if left untreated. Modern ophthalmic surgery leads to vision with IOL improvement and solving the eyes after severe combat injury.

Occult intraocular aluminium foreign body causing rhegmatogenous retinal detachment: a case report

BACKGROUND

Ocular trauma is complex and varied, and some occult intraocular foreign bodies (IOFBs) can lead to uncommon symptoms and signs. We report a case of rhegmatogenous retinal detachment (no obvious wound, no pain, no intraocular infection or other symptoms) caused by an occult intraocular aluminium foreign body, which could have been easily missed.

CASE PRESENTATION

A 42-year-old male presented to the outpatient department of our hospital complaining of fluttering black dots and decreased vision in his left eye that began 3 months earlier. He was diagnosed with "floaters" at a community hospital. He denied a history of ocular trauma or previous surgery. The cornea and lens of the left eye were clear. A small patch of pigmentation was noted in the temporal sclera. Fundoscopy revealed macula-off retinal detachment. After mydriasis, elliptical holes were seen in the peripheral retina at 2:30, and a suspicious hyperreflective strip was found under the anterior lip of the retina by Goldmann three-mirror contact lens examination; the strip was confirmed to be an IOFB by orbital CT. The IOFB was removed through pars plana vitrectomy without any complications.

CONCLUSION

Unlike iron and copper IOFBs, aluminium IOFBs are more inert and more likely to be missed. For people with special occupations (construction workers, mechanics, etc.), when abnormal pigmentation of the sclera is found, the possibility of foreign bodies in the eye should be considered. In the process of disease diagnosis and treatment, it is necessary to ask for a detailed history, including occupation history and practice, and perform careful physical and targeted examinations. Such comprehensive analysis regarding the above information will minimize the chance of missed diagnosis.Awareness of occult IOFB in high risk occupations and prompt referral to a retinal surgeon is of outmost importance.

Ophthalmic Trauma Malpractice in the Ophthalmic Mutual Insurance Company Database

PURPOSE

To review ophthalmic trauma malpractice claims in the Ophthalmic Mutual Insurance Company (OMIC) database to determine the frequency and causes of litigation.

METHODS

A retrospective case series analysis of ophthalmic trauma claims from 2009 to 2019 was completed. Cases were selected only if the injury was secondary to trauma (e.g., fall, gunshot wound, paintball injury, etc.); iatrogenic traumatic surgical injuries were excluded.

RESULTS

31 closed cases associated with 40 total claims related to ophthalmic trauma out of 2565 claims (1.56%) in the OMIC database were analysed. 13 of the 31 cases (41.9%) were decided for the plaintiff. In decisions for the plaintiff, the median settlement amount was $330,000 (range $125,000-$1,000,000). The most frequent initial diagnoses were corneal abrasion (n = 10), hyphema (n = 5) and open-globe injury (n = 5), and the most common final diagnoses were endophthalmitis (n = 8), intraocular foreign body (n = 7) and retinal detachment (n = 7). The most common causes of malpractice litigation were a delay in referral or follow-up (n = 11) and failure to get appropriate imaging (n = 8). In the 13 cases decided for the plaintiff, experts concluded nine did not meet standard of care.

CONCLUSIONS

Ophthalmic trauma malpractice claims are very uncommon in the United States, however, the payout is higher than non-trauma settlements, and approximately 40% of cases were decided for the plaintiff. Care could be improved with a careful history and complete ophthalmic examination (with dilated fundoscopy), imaging in appropriate patients, meticulous documentation, and early sub-specialist referral when the diagnosis or management plan was unclear.

Intraoperative Optical Coherence Tomography-guided 25G Microamount Trajectory Vitrectomy for the Treatment of Penetrating Ocular Injury Caused by a Foreign Body in the Right Eye: A Case Study

BACKGROUND

Optical coherence tomography (OCT) is a real-time three-dimensional tomography optical imaging technology that uses near-infrared waves to take cross-sectional pictures of the retina and other tissues. A few studies have reported the use of intraoperative OCT navigation for the removal of foreign bodies from the eyeball during surgery. The objective is to present a single case with a small foreign body (not embedded in the retina) treated with intraoperative OCT guided 25G micro-amount trajectory vitrectomy.

CASE PRESENTATION

The examination of a 25-year-old man, who suffered from right eye pain, suggested the following: the visual acuity was 20/250, the intraocular pressure was 8 mmHg, a scleral penetrating wound was visible at 3 mm behind the limbus at 7 o' clock, and Tyn (+). The vitreous showed some flocculent turbidity, the retina was flat, and the foreign body was visible at 10 o' clock. On the day of admission, the patient underwent a micro-amount vitrectomy with the removal of the foreign body. The vitreous body affected by the foreign body was then removed through the original wound track by using intraoperative OCT navigation.

CONCLUSION

The final follow-up showed the best-corrected vision of the right eye as 20/25 andno occurrence of complications. The intraoperative OCT-guided 25G micro-amount trajectory vitrectomy could be used as an accurate, useful, and safe method for foreign body extraction.

Iron contributes to photoreceptor degeneration and Müller glia proliferation in the zebrafish light-treated retina

Zebrafish possess the ability to completely regenerate the retina following injury, however little is understood about the damage signals that contribute to inducing Müller glia reprogramming and proliferation to regenerate lost neurons. Multiple studies demonstrated that iron contributes to various retinal injuries, however no link has been shown between iron and zebrafish retinal regeneration. Here we demonstrate that Müller glia exhibit transcriptional changes following injury to regulate iron levels within the retina, allowing for increased iron uptake and decreased export. The response of the zebrafish retina to intravitreal iron injection was then characterized, showing that ferrous, and not ferric, iron induces retinal cell death. Additionally, iron chelation resulted in decreased numbers of TUNEL-positive photoreceptors and fewer proliferating Müller glia. Despite the contribution of iron to retinal cell death, inhibition of ferroptosis did not significantly reduce cell death following light treatment. Finally, we demonstrate that both the anti-ferroptotic protein Glutathione peroxidase 4b and the Transferrin receptor 1b are required for Müller glia proliferation following light damage. Together these findings show that iron contributes to cell death in the light-damaged retina and is essential for inducing the Müller glia regeneration response.

Value of Ocular Endoscopy in Extraction of Intraocular Foreign Bodies of Cilia in Patients with Open Ocular Trauma

BACKGROUND The aim of this study was to analyze the value of ocular endoscopy in detecting and extracting intraocular cilia in patients with ocular trauma. MATERIAL AND METHODS We retrospectively analyzed data on identification and extraction of 46 intraocular cilia in 16 eyes with open-globe injury during endoscope-assisted vitrectomy. RESULTS A total of the 16 patients with open-globe injury were operated on from September 2002 to June 2019. The cornea in 14 eyes was cloudy. Two eyes had endophthalmitis and 13 eyes had retinal detachment. A total of 46 cilia were extracted through direct observation under the ocular endoscope during vitrectomy 1 to 68 weeks after injury. The number of cilia per eye varied from 1 to 10. Most of the cilia were located in or near the wound. Postoperative IOP was normal in 14 patients. The follow-up after surgery showed hypotony in only 2 eyes (7.2 and 5.8 mmHg, respectively). Compared with preoperative intraocular pressure, there was a statistically significant difference. The postoperative visual acuity improved in 12 eyes and remained unchanged in 3 eyes. The vision after surgery was significantly improved compared with that before surgery (P=0.006). The intraocular pressure increased significantly after operation (P<0.001). And no glaucoma or retinal detachment or endophthalmitis was found. No eyes needed additional vitreous surgery. CONCLUSIONS Ocular endoscopy allows surgeons to detect intraocular cilia that were no undetected by CT or B-ultrasound preoperatively in time and to extract them effectively. It improves performance of vitrectomy in the presence of a cloudy cornea and also prevents exogenous endophthalmitis. The vision of patients with ocular trauma was improved.

"IRIS SHELF" TECHNIQUE FOR MANAGEMENT OF POSTERIOR SEGMENT INTRAOCULAR FOREIGN BODIES

PURPOSE

To describe "iris shelf" technique for removal of posterior segment intraocular foreign bodies (IOFBs) through a corneal incision combined with phacovitrectomy and to report its outcomes.

METHODS

Medical records of patients with posterior segment metallic IOFBs who had combined phacovitrectomy were collected and analyzed. In all patients, the IOFB was placed on the iris surface after forming the anterior chamber with viscoelastic to be extracted through a corneal phacoemulsification incision.

RESULTS

Thirty-three eyes of 33 male patients with a mean age of 31.6 ± 8.3 years were included in the study. The mechanism of injury was hammering in 24 eyes (72.7%) and gunshot in 9 eyes (27.3%). The mean interval between injury and IOFB removal was 14.76 ± 6 days. The mean IOFB volume was 8.5 ± 5.5 mm3, and its longest dimension was 3.45 mm (range, 1-8 mm). The mean preoperative corrected distance visual acuity changed from 20/1,500 (1.79 logarithm of the minimum angle of resolution) to 20/94 (0.67 logarithm of the minimum angle of resolution), postoperatively (P < 0.001). Postoperative complications included retinal detachment (two eyes), proliferative vitreoretinopathy (one eye), epiretinal membrane (one eye), and posterior synechiae (three eyes).

CONCLUSION

The "iris shelf" technique with phacovitrectomy is a safe and reproducible approach for posterior segment IOFB extraction through a corneal incision with favorable visual and anatomical outcomes.

Visual electrophysiology in the assessment of toxicity and deficiency states affecting the visual system

Visual disturbance or visual failure due to toxicity of an ingested substance or a severe nutritional deficiency can present significant challenges for diagnosis and management, for instance, where an adverse reaction to a prescribed medicine is suspected. Objective assessment of visual function is important, particularly where structural changes in the retina or optic nerve have not yet occurred, as there may be a window of opportunity to mitigate or reverse visual loss. This paper reviews a number of clinical presentations where visual electrophysiological assessment has an important role in early diagnosis or management alongside clinical assessment and ocular imaging modalities. We highlight the importance of vitamin A deficiency as an easily detected marker for severe combined micronutrient deficiency.

A rare asymptomatic metallic intraocular foreign body retained in the anterior chamber for 15 years: A case report

RATIONALE

Intraocular foreign bodies (IOFBs) are common in ocular injuries, but asymptomatic metallic IOFBs retained in the anterior chamber for years are rare.

PATIENT CONCERNS

A 31-year-old female presented with blurred vision in her right eye after lumbar magnetic resonance imaging. Her best-corrected vision acuity was 0.6 in the right eye and 1.0 in the left eye. Slit-lamp examination revealed a brown granular foreign body in the anterior chamber and pigmentation of the limbus. Lens and retina examination indicated ocular siderosis. Corneal endothelioscopy revealed decreased endothelial cell density. A detailed history showed ocular globe injury 15 years earlier.

DIAGNOSES

Anterior chamber IOFB with ocular siderosis.

INTERVENTIONS

Anterior chamber foreign body removal was performed with appropriate incision and forceps.

OUTCOMES

The anterior chamber IOFB was successfully removed and examined as a magnetic metal foreign body. The best-corrected vision acuity was 1.0 at 1 day postoperatively. An abnormal electroretinogram with a 12% decrease in the "b" wave and a 91% decrease in the "a" wave was observed 3 months postoperatively. There were no intraoperative or postoperative complications during a 3-month follow-up.

LESSONS

Eye trauma should be examined carefully to exclude IOFBs. Asymptomatic anterior chamber foreign bodies can also cause corneal endothelial injury and ocular siderosis. Careful examination and timely management are needed in such cases.

Correlation Between Electroretinogram and Visual Prognosis in Metallic Intraocular Foreign Body Injury

Purpose: This study aims to investigate the correlation between electroretinogram (ERG) and visual outcome in eyes with metallic intraocular foreign body (IOFB) injury.

Methods: Cases with metallic IOFB injuries with preoperative ERG from January 2008 to May 2020 were reviewed retrospectively. Five ERG responses were recorded, including rod response, maximal response, oscillatory potentials, cone response, and 30-Hz flicker. The results were compared between the affected and the contralateral eyes. All patients received surgery to remove IOFBs. The correlation between amplitudes, implicit times, and grades of ERG with final best-corrected visual acuity (BCVA) was analyzed.

Results: A total of 33 eyes of 33 patients were included. The eyes with IOFB had generally delayed implicit time and reduced amplitude in all waves. The maximum change was found in oscillatory potentials S3 and N1 (0.42 ± 0.42 and 1.95 ± 1.97 of the fellow eyes, respectively, p < 0.05). All amplitudes were negatively correlated with the final BCVA (rs: −0.676 to −0.459, all p < 0.05). In contrast, all implicit times were positively correlated with final BCVA, although, some of them were not statistically significant (rs: 0.035 to 0.687). Among them, oscillatory potential P3 has the highest correlation coefficient (rs = 0.687, p < 0.001). All grades of ERG waves were statistically correlated with the final BCVA (rs: −0.596 to −0.664, all p < 0.001).

Conclusions: ERG can be used to assess visual outcome in metallic IOFB injury after surgery. Oscillatory potentials provided the most significant responses.

Clinical Characteristics and Visual Outcomes in Patients with Intralenticular Foreign Bodies with Self-Sealing Corneal Penetrating Wounds

Purpose

Siderosis bulbi may occur as a result of retained intralenticular foreign bodies (ILFBs) that were missed during examination in patients with self-sealing wounds and without a significant decrease in visual acuity. This study aimed to explore the clinical characteristics and visual outcomes of ILFBs with self-sealing corneal penetrating wounds.

Methods

Fifteen eyes of 15 patients with ILFBs and self-sealing corneal penetrating wounds, seen between October 2014 and September 2019, were retrospectively analyzed. Data regarding the patient demographics, clinical features, surgical procedure, and initial and final best-corrected visual acuity (BCVA) were analyzed.

Results

All patients were male with a mean age of 41 years. The foreign bodies passed through the cornea, sometimes through the iris, through the anterior capsule, and finally localized in the lens. All ILFBs were pointed and metallic objects and were successfully removed with phacoemulsification and posterior chamber intraocular lens (IOL) implantation. Anterior capsule violation was found in three eyes, but no posterior capsule rupture was found. The IOL was placed in a capsule bag in all the cases. The BCVA ranged from 20/200 to 20/25 preoperatively and improved to between 20/32 and 20/20 at the last follow-up visit. The IOLs were well-centered. Apart from posterior capsule opacity in four eyes, no other postoperative complications were found.

Conclusions

In patients with a pointed metallic ILFB and self-sealing corneal penetrating wounds (with or without cataracts), early diagnosis and removal of the metallic ILFB combined with lens removal and IOL implantation may avoid late complications and achieve good visual outcomes.