Intratarsal Keratinous Cyst at the Eyelid Margin: A Case Report.

An uncommon case of an intratarsal keratinous cyst at the lid margin is described in a 73-year-old Asian man using long-term antiglaucoma eye drops. There was no history of trauma or surgery of the upper eyelid. A yellow solid mass attached to the tarsal plate had been located there for about 3 years. It imitated a sebaceous gland carcinoma or steatocystoma simplex. Excision biopsy showed cystic formation and leaked yellow creamy substance without hair. Histopathological and immunological findings helped make the diagnosis of an intratarsal keratinous cyst. To the best of our knowledge, this is the first case report of an intratarsal keratinous cyst at the lid margin.

The effects of topical cycloplegics in acute acquired comitant esotropia induced by excessive digital device usage.

BACKGROUND: Acute acquired comitant esotropia induced by excessive digital device usage, especially smartphones (SAACE), has been increasing over the past few years. One suggested mechanism is convergence spasm induced by excessive near work, with refraining from digital device use considered to be an effective method for decreasing the degree of esodeviation. However, if symptoms persist and are untreated over time, recovery becomes more difficult. The present study evaluated the effects of topical cycloplegics on persistent SAACE untreated for over 1 year. METHODS: Patients with sustained SAACE that was untreated for over 1 year were evaluated. Digital device usage was discouraged and a topical cycloplegic, 0.4% tropicamide, was prescribed at bedtime. After obtaining informed consent, the 14 out of 23 enrolled patients who agreed to eye drop administration were defined as the study group, with the others serving as the controls. After a 3-month follow-up, patients who elected to undergo surgery were analyzed as the surgery group. Changes in esotropia angles, stereoacuity and diplopia complaints were evaluated after a 3-month follow-up. RESULTS: Esotropia angles decreased and stereoacuity improved after a 3-month treatment in the study group (P < 0.01). Diplopia disappeared in 13 patients (92.9%, totally disappeared or disappeared when using glasses with built-in prisms). Among 11 patients with untreated esotropia ranging from 1-3 years, decreases in esotropia angles were correlated to untreated esotropia duration (near: R = -0.6; distance: R = 0.7; both P < 0.05). Esotropia angles in the control group exhibited a tendency to increase while stereoacuity tended to deteriorate after the 3-month follow-up. As diplopia did not disappear in any patients, 7 elected to undergo surgery and were enrolled as the surgery group. While esotropia angles decreased in the study group, they were lower than the surgery group (P < 0.01), but higher than the control group (P < 0.01). Stereoacuity was worse in the control versus the study and surgery groups (both P < 0.05). CONCLUSION: Results suggest short-acting topical cycloplegics are effective in SAACE patients with long untreated periods. Decreases in esotropia angles were negatively correlated to untreated esotropia duration, which suggests the necessity of early treatment.

Changes in Macular Pigment Optical Density among Pseudophakic Patients following Intake of a Lutein-Containing Supplement.

INTRODUCTION: Cataract surgery has been reported as a long-term risk of reduced macular pigment optical density (MPOD). This study investigated changes in MPOD in pseudophakic patients after lutein supplementation. METHODS: Fifty-seven patients who had no ocular diseases and underwent cataract surgery with concurrent implantation of clear intraocular lenses were included. MPOD was measured before lutein supplementation and every week during 6 weeks of supplementation. Two additional measurements were conducted after the end of supplementation. RESULTS: Compared with baseline, MPOD was increased after 1 week of supplementation (p < 0.01) and remained elevated after cessation of supplementation. After 3 weeks of supplementation, MPOD in females was higher than that in males (p < 0.05). Compared with patients at the highest quintile baseline MPOD, patients of both genders at the lowest quintile had significant increases after 6 weeks of supplementation (p < 0.05). CONCLUSION: MPOD increased after lutein supplementation in patients who had undergone cataract surgery. With the same amount of lutein supplementation, MPOD increased more in patients with low MPOD at baseline; it also increased more in females than in males. Lutein supplementation is presumed to support increased MPOD, which can reduce the risk of age-related macular degeneration, especially in females with low MPOD.

Changes in cone-driven functions after intravitreal aflibercept injections in patients with age-related macular degeneration.

PURPOSE: To determine the changes in the cone-driven functions in patients with age-related macular degeneration (AMD) treated with intravitreal aflibercept. METHODS: We studied 44 eyes of 44 patients diagnosed with AMD whose mean age was 75 years. The contralateral unaffected eyes served as controls. All patients were initially treated with 3 consecutive monthly intravitreal aflibercept injections and thereafter with bimonthly injections for 12 months. Full-field cone electroretinograms (cone ERGs) were recorded at the baseline and at 3, 6, and 12 months after beginning the intravitreal aflibercept injections. The cone ERGs were elicited by red stimuli on a blue background. The focal macular ERGs (fmERGs) were elicited by 15 degrees white stimulus spot centered on the fovea. The amplitudes of the a- and b-waves, photopic negative response (PhNR), and sum of the oscillatory potentials (ΣOPs, sum of OP1-3 amplitudes) were analyzed. In addition, the implicit times of the a- and b-waves were also analyzed. RESULTS: The amplitudes and implicit times of all components of the fmERGs were significantly improved compared to the baseline at 3 months after beginning the intravitreal aflibercept injections (P < 0.0005-0.05). The amplitudes of the a-waves and PhNRs were further increased during the maintenance phase (P < 0.005-0.01). On the other hand, the amplitudes of the full-field a-waves and PhNR of the cone ERGs were significantly reduced at 6 and 12 months compared to the baseline. CONCLUSIONS: The macular function improved continuously during the maintenance phase of the intravitreal aflibercept injections. In contrast, the cone-driven functions of the more peripheral retina decreased with repeated injections suggesting adverse effects of the intravitreal aflibercept injections on the function of the more peripheral normal retina.

Changes of focal macular and full-field electroretinograms after intravitreal aflibercept in patients with central retinal vein occlusion.

PURPOSE: To evaluate the physiology of the macular and whole retina after intravitreal aflibercept (IVAs) injections in patients with macular edema associated with a central retinal vein occlusion (CRVO) by electroretinography (ERG). METHODS: We studied 20 eyes of 20 patients with non-ischemic CRVO (72.0 ± 9.2 years). All patients were treated with monthly injections of IVA for the initial 3 months and then treated by the treat-and-extend (TAE) regimen for 12 months. The best-corrected visual acuity (BCVA), optical coherence tomographic images, focal macular ERGs (fmERGs), and full-field ERGs recorded before and after the treatment were compared. The fmERGs were elicited by a 15° white stimulus spot centered on the fovea. The full-field ERGs were recorded by a protocol recommended by International Society for Clinical Electrophysiology of Vision. The amplitudes and implicit times determined before and after the IVA were compared. RESULTS: The foveal thickness was significantly reduced accompanied by improvement of the BCVA after the treatments, and the improvements were maintained for at least 12 months. The amplitudes and implicit times of the fmERGs improved continuously for the 12 months. On the other hand, the reduced amplitudes of the full-field ERG, summed oscillatory potentials, and the photopic negative responses remained unchanged for the 12-month period. However, the implicit times of the maximum and cone responses were significantly shortened after the IVA. CONCLUSIONS: IVA injections by the TAE regimen led to a continuous improvement of the macular function in patients with ME associated with a CRVO. However, the function of the whole retina changed differently than the macula after the treatment.

Macular function following intravitreal ranibizumab for macular edema associated with branch retinal vein occlusion: 12-month results.

PURPOSE: To evaluate the 12-month effects of intravitral ranibizumab (IVR) injections on the physiology and morphology of the macula in eyes with a branch retinal vein occlusion with macular edema (BRVOME). METHODS: We studied 13 eyes of 13 patients with a BRVOME. All patients were initially treated with IVR injections at 3 consecutive monthly intervals, the initiation phase. Additional treatments were done according to the pro re nata (PRN) regimen. The physiology of the macula was assessed by the focal macular electroretinograms (fmERGs) and the best-corrected visual acuity (BCVA). The morphology of the macular area was determined by spectral-domain optical coherence tomography. The retina was assessed at the baseline, and at 3, 6, and 12 months after beginning the IVR injections. The fmERGs were elicited by a 15° circular stimulus, and also by 15° semicircular stimuli placed on the occluded or non-occluded side of the macula. The amplitudes of the a- and b-waves, photopic negative response (PhNR), and sums of the oscillatory potentials (ΣOPs) were measured. In addition, the implicit times of the a- and b-waves were measured. RESULTS: The BCVA was improved significantly relative to the baseline after the initiation phase (P < 0.01), and it was maintained with the PRN regimen for the 12-month experimental period. The foveal thickness was also significantly decreased after the initiation phase (P < 0.005) but was then worse at 12 months during the maintenance phase (P < 0.05). The fmERGs on the occluded side were significantly reduced at the baseline, and the b-waves and ΣOPs amplitudes improved after the initiation phase. However, they decreased during the PRN period. On the non-occluded side, the amplitudes and implicit times of the a- and b-waves remained unchanged after the initiation phase, the PhNR and ΣOPs amplitudes significantly increased at 3 months compared to the baseline (PhNR, P < 0.005; ΣOPs, P < 0.005), which was maintained throughout the 12 month study period. CONCLUSIONS: The deterioration of the macular function on the occluded side during the maintenance phase suggests that there is a progression of the disease process during the PRN period in eyes with BRVOME.

Retinal dysfunction of syphilitic outer retinopathy.

PURPOSE: We present our findings in two cases of retinal dysfunction caused by syphilitic outer retinopathy. CASE 1: A 59-year-old man visited our clinic complaining of blurred vision in his left eye. Optical coherence tomography (OCT) demonstrated an absence of the ellipsoid zone (EZ) in the left eye. A round yellowish-white lesion was observed in the posterior pole of the left fundus. Fundus autofluorescence (FAF) showed hyperfluorescent areas in the posterior pole of both fundi although no specific ophthalmoscopic findings were seen in the right eye. The amplitudes of the LA 3.0 1 Hz and LA 3.0 30 Hz ERG responses were reduced with better preservation of the rod responses. Based on a strong positivity to the rapid plasma reagin (RPR) assay and the Treponema pallidum hemagglutination (TPHA) test, he was diagnosed with syphilitic outer retinopathy and treated with systemic antibiotics. The treatment resulted in a restoration of the retinal structures and cone function. CASE 2: A 47-year-old man was referred to our clinic complaining of reduced vision in both eyes. Although the ocular fundus appeared normal, FAF showed a diffuse hyperfluorescent area in the posterior pole and multiple hyperfluorescent spots. Indocyanine green angiography showed multiple confluent areas of hypofluorescence. OCT demonstrated irregular EZs in both eyes. The amplitudes of the LA 3.0 1 Hz and LA 3.0 30 Hz ERG responses were slightly reduced with prolonged implicit times. These findings are comparable to the findings in patients with multiple evanescent white dot syndrome. However, the strong positivity to the RPR and TPHA tests led us to diagnose the patient with outer retinopathy caused by syphilis. Systemic administration of antibiotics resulted in the restoration of the retinal structures and retinal function. CONCLUSIONS: Syphilitic outer retinopathy affected the retinal structures and function that can be restored by antibiotic treatments.

Macular function following intravitreal ranibizumab for macular edema associated with branch retinal vein occlusion.

PURPOSE: To determine the physiology of the macula by the focal macular electroretinograms (fmERGs) in patients with branch retinal vein occlusion with macular edema (BRVOME) treated by intravitreal injections of ranibizumab (IVR). METHODS: We studied 17 eyes of 17 patients with BRVOME. The contralateral unaffected eyes served as controls. All patients were treated with an IVR at monthly intervals for 3 consecutive months. The baseline best-corrected visual acuity (BCVA), optical coherence tomographic (OCT) findings, and fmERGs were compared to the post-treatment values. The fmERGs were elicited by a 15° circular spot or a superior or inferior semicircular spot. The center of the spot was placed on the fovea. The amplitudes of the a- and b-waves, photopic negative response (PhNR), and sum of the oscillatory potentials (ΣOPs: sum of OP1, OP2, and OP3 amplitudes) were measured. In addition, the implicit times of the a- and b-waves were also measured. RESULTS: The BCVA improved significantly from 0.39 ± 0.28 logMAR units to 0.17 ± 0.18 logMAR units after the resolution of the central macular edema (P < 0.01). All components of the fmERGs elicited by the semicircular stimulus spot placed on the occluded side were smaller than that elicited from the corresponding area of the control eyes. The b-wave amplitudes increased significantly from 0.49 ± 0.25 to 0.75 ± 0.36 µV following the IVR injections, but the amplitudes of the a-wave and PhNR remained reduced (P < 0.05). The amplitudes of the PhNR and ΣOPs elicited by stimulating the non-occluded side were reduced with relative preservation of the a- and b-waves (P < 0.05). They recovered after the treatment from 0.27 ± 0.15 to 0.50 ± 0.30 and 0.33 ± 0.15 to 0.53 ± 0.19 µV, respectively. CONCLUSIONS: IVRs improved the macular function not only on the occluded side but also on the non-occluded side. On the occluded side, the BRVOME affects the function of all retinal layers of the macula. Even after the IVR, the function of the photoreceptors and retinal ganglion cells remained abnormal. On the non-occluded side, the inner retinal function improved after the IVR.

Gender differences in mRNA expression of aquaporin 8 and glutathione peroxidase in cataractous lens following intake of an antioxidant supplement.

Antioxidants can decrease oxidative damage and prevent age-related ocular disease. Our previous investigation on human aqueous humor following intake of a lutein-containing antioxidant supplement reported an increase in the scavenging activity of superoxide in both genders and an increase in the amount of hydrogen peroxide (H2O2) in females. Aquaporin 8 (AQP8) is a diffusion facilitator of H2O2 and glutathione peroxidase (Gpx) is a H2O2 scavenging enzyme. The correlation between AQP8 and Gpx may be the key to determining how oxidative stress in the aqueous humor affects the lens after intake of antioxidant supplements. In this study, 24 patients with the same grade of binocular cataract were included. Anterior capsule samples, including lens epithelial cells (LECs), were collected during cataract surgery before (as pre-intake samples) and after 6 weeks of oral intake of Ocuvite Lutein ® (as post-intake samples). The mRNA expression of APQ8 and Gpx was measured using real-time polymerase chain reaction. Among males, AQP8 expression decreased significantly after the supplementation (P = .03), while there was no statistical change among females. AQP8 expression was significantly correlated to that of Gpx in post-intake samples among females (R = 0.69, P = .02), while no correlation was evident among males. The results suggest antioxidant supplementation may work by different mechanisms on LECs between genders. After supplementation, a decrease in AQP8 in LECs may inhibit the influx of H2O2 from the aqueous humor in males. In females however, the correlation between AQP8 and Gpx in LECs may indicate an increase in Gpx activity following the influx of H2O2 from the aqueous humor and further scavenging of H2O2.

The neuroprotective effect of latanoprost acts via klotho-mediated suppression of calpain activation after optic nerve transection.

Latanoprost was first developed for use in glaucoma therapy as an ocular hypotensive agent targeting the prostaglandin F2α (FP) receptor. Subsequently, latanoprost showed a neuroprotective effect, an additional pharmacological action. However, although it is well-known that latanoprost exerts an ocular hypotensive effect via the FP receptor, it is not known whether this is also true of its neuroprotective effect. Klotho was firstly identified as the gene linked to the suppression of aging phenotype: the defect of klotho gene in mice results aging phenotype such as hypokinesis, arteriosclerosis, and short lifespan. After that, the function of klotho was also reported to maintain calcium homeostasis and to exert a neuroprotective effect in various models of neurodegenerative disease. However, the function of klotho in eyes including retina is still poorly understood. Here, we show that klotho is a key factor underlying the neuroprotective effect of latanoprost during post-axotomy retinal ganglion cell (RGC) degeneration. Importantly, a quantitative RT-PCR gene expression analysis of klotho in sorted rat retinal cells revealed that the highest expression level of klotho in the retina was in the RGCs. Latanoprost acid, the biologically active form of latanoprost, inhibits post-traumatic calpain activation and concomitantly facilitates the expression and shedding of klotho in axotomized RGCs. This expression profile is a good match with the localization, not of the FP receptor, but of organic anion transporting polypeptide 2B1, known as a prostaglandin transporter, in the ocular tissue. Furthermore, an organic anion transporting polypeptide 2B1 inhibitor suppressed latanoprost acid-mediated klotho shedding ex vivo, whereas an FP receptor antagonist did not. The klotho fragments shed from the RGCs reduced the intracellular level of reactive oxygen species, and a specific klotho inhibitor accelerated and increased RGC death after axotomy. We conclude that the shed klotho fragments might contribute to the attenuation of axonal injury-induced calpain activation and oxidative stress, thereby protecting RGCs from post-traumatic neuronal degeneration.

Comparisons of focal macular electroretinograms after indocyanine green-, brilliant blue G-, or triamcinolone acetonide-assisted macular hole surgery.

PURPOSE: To compare the effects of indocyanine green (ICG)-, brilliant blue G (BBG)-, or triamcinolone acetonide (TA)-assisted internal limiting membrane (ILM) peeling during macular hole (MH) surgery on the different components of the focal macular electroretinograms (fmERGs). METHODS: Forty-eight eyes of 48 patients with a macular hole were randomly divided into those undergoing ICG-, BBG-, or TA-assisted vitrectomy (n = 16 for each group). All patients had combined cataract and macular hole surgery with ILM peeling. The fmERGs were recorded before, and 1, 3, 6, 9, and 12 months postoperatively. The amplitudes and implicit times of the a- and b-waves, the amplitudes of the sum of the oscillatory potentials (ΣOPs), and the photopic negative responses (PhNRs) were analyzed. RESULTS: The amplitudes of all of the components of the fmERGs gradually increased with time after surgery (P < 0.005). The implicit times of the a- and b-waves were significantly prolonged at 1 month (P < 0.01) and then gradually returned to the baseline times. No significant differences were found in these changes among the groups. In pooled data from the 48 patients, the PhNR amplitude increased more than the a- and b-waves and the ΣOPs amplitudes at every time point after 3 months (P < 0.005). CONCLUSIONS: The lack of significant differences on the different components of the fmERGs indicates that none of the three agents was toxic to the macula. After closure of a MH, the function of the retinal ganglion cells may recover more than that of the other neural elements in the macular area.

RETINAL PIGMENT EPITHELIUM UNDULATIONS IN ACUTE STAGE OF VOGT-KOYANAGI-HARADA DISEASE: Biomarker for Functional Outcomes After High-Dose Steroid Therapy.

PURPOSE: To determine the clinical significance of retinal pigment epithelium (RPE) undulations in the acute stage of Vogt-Koyanagi-Harada disease. METHODS: Retinal pigment epithelium undulations were detected and classified into 3 grades: Grade 1, slight; Grade 2, moderate; and Grade 3, severe undulations, in the enhanced depth imaging optical coherence tomographic images. The relationship between the clinical characteristics and the presence of RPE undulations was investigated. RESULTS: Among the 61 eyes of 31 patients with Vogt-Koyanagi-Harada disease, 40 eyes had some degree of RPE undulations (Grade 1 = 12, Grade 2 = 15, and Grade 3 = 13). The patients with RPE undulations in both eyes were significantly older at the onset (P = 0.0002). The eyes with RPE undulations were more likely to develop posterior recurrences (P = 0.032) and have worse vision at 12 months (P = 0.043). Multiple regression analysis revealed that RPE undulations were an independent predictor of posterior recurrences (P = 0.009) and poor visual outcomes (P = 0.035). CONCLUSION: Retinal pigment epithelium undulations detected by enhanced depth imaging optical coherence tomographic are relatively frequent occurrences at the acute stage of Vogt-Koyanagi-Harada, and their presence is a predictor of posterior recurrences and poor visual outcomes after high-dose steroid therapy.

Molecular, anatomical and functional changes in the retinal ganglion cells after optic nerve crush in mice.

PURPOSE: Optic nerve crush (ONC) and subsequent axonal damage can be used in rodents to study the mechanism of retinal ganglion cell (RGC) degeneration. Here, we examined electroretinograms (ERGs) in post-ONC mice to investigate changes in the positive scotopic threshold response (pSTR). We then compared these changes with molecular and morphological changes to identify early objective biomarkers of RGC dysfunction. METHODS: Fifty 12-week-old C57BL/6 mice were included. ONC was used to induce axonal injury in the right eye of each animal, with the left eye used as a control. The expression of the RGC markers Brn3a and Brn3b was measured on days 1, 2, 3, 5 and 7 after ONC with quantitative real-time PCR. ERGs were recorded under dark adaptation with the stimulus intensity increasing from -6.2 to 0.43 log cd-s/m(2) on days 1, 2, 3, 5, 7 and 10 after ONC. The pSTR, a- and b-wave amplitudes were measured. Inner retinal thickness around the optic nerve head was measured with spectral-domain optical coherence tomography on days 0, 2, 5, 7 and 10 after ONC. RESULTS: The expression of Brn3a and Brn3b began to significantly decrease on day 1 and day 2, respectively (P < 0.01). The amplitude of the pSTR underwent rapid, significant deterioration on day 3, after which it fell gradually (P < 0.01), while the a- and b-wave amplitudes remained unchanged throughout the experiment. Inner retinal thickness gradually decreased, with the most significant reduction on day 10 (P < 0.01). CONCLUSIONS: Decrease in pSTR likely reflected the early loss of RGC function after ONC and that declining expression of RGC-specific genes preceded anatomical and functional changes in the RGCs.

Structures affecting recovery of macular function in patients with age-related macular degeneration after intravitreal ranibizumab.

PURPOSE: To determine the retinal structures affecting the recovery of macular function in patients with exudative age-related macular degeneration (AMD) treated with intravitreal ranibizumab (IVR). METHOD: Thirty eyes of 30 patients with exudative AMD who were treated with IVR at monthly intervals for 3 months were studied. Focal macular electroretinograms (fmERGs) and spectral-domain optical coherence tomography (SD-OCT) were performed before and 3 months after beginning the IVR injections. The fmERGs were elicited by a 15° white stimulus spot centered on the fovea. The thickness of different retinal layers, presence of a serous retinal detachment (SRD), and presence of a pigment epithelial detachment (PED) at the fovea was determined in the SD-OCT images. Measurements were made of the inner, middle, and outer layers of the retina and also of the SRD and PED in the horizontal and vertical meridians at 1.2 mm from the fovea (parafoveal regions). The significance of the correlations between these structural parameters and the a-wave amplitude of the fmERG was determined. RESULTS: There was no significant correlation between the structural parameters of the fovea and the a-wave amplitude. In the parafoveal regions, the thickness of the outer retinal layer was significantly correlated with an increase of the a-wave amplitude (R = 0.56, P = 0.001). In addition, the SRD thickness was negatively and significantly correlated with the a-wave amplitude (R = -0.54, P = 0.002). The change in the parafoveal SRD thickness after IVRs was the only independent determinant of recovery of the a-wave amplitude after the treatments (P < 0.05). CONCLUSIONS: The macular function measured by the fmERGs was determined by the parafoveal outer layer and SRD thickness in patients with exudative AMD. Of these, changes in the SRD thickness by IVRs most strongly affected the recovery of macular function.

Recoverin-associated retinopathy secondary to Warthin tumor of parotid gland.

PURPOSE: To present a case of photoreceptor degeneration associated with a benign Warthin tumor of the parotid gland. CASE REPORT: A 57-year-old man visited our clinic complaining of blurred vision in both eyes. His best-corrected visual acuity was 0.07 in the right and 0.04 in the left eyes. All components of the full-field electroretinograms (ERGs) were reduced in both eyes. The focal macular ERGs were extinguished in both eyes, which was consistent with the deterioration of the outer retina in optical coherence tomographic images. Positron emission tomography showed (18)F-fluorodeoxy glucose accumulation in the left parotid gland. Parotidectomy was performed, and the histopathology of the specimen had features compatible with a Warthin tumor without malignancy. Western blot analysis of the patient's sera detected an antibody against recoverin. In addition, the tumor tissue had an aberrant expression of recoverin. CONCLUSION: The findings in this case indicate that recoverin-associated retinopathy can develop secondary to a benign Warthin tumor.

Comparisons of cone electroretinograms after indocyanine green-, brilliant blue G-, or triamcinolone acetonide-assisted macular hole surgery.

PURPOSE: To compare the function of retinal ganglion cells (RGCs) using the photopic negative response (PhNR) in patients who had undergone indocyaine green (ICG)-assisted, brilliant blue G (BBG)-assisted, or triamcinolone acetonide (TA)-assisted internal limiting membrane (ILM) peeling during macular hole (MH) surgery. METHODS: Forty-eight eyes of 48 patients with a macular hole were randomly divided into those undergoing ICG-assisted, BBG-assisted, or TA-assisted vitrectomy (n = 16 for each group). Full-field cone ERGs were recorded before and 1, 3, 6, 9, and 12 months postoperatively. The amplitudes and implicit times of the a-waves and b-waves and the amplitudes of the oscillatory potentials (OPs) and PhNRs were measured. The mean deviations (MDs) of standard automated perimetry and the best-corrected visual acuity (BCVA) were measured. The circumferential retinal nerve fiber layer (RNFL) thickness was evaluated by SD-OCT. RESULTS: All macular holes were closed with a significant improvement of the BCVA and MD without differences among the groups. There was no significant difference between the preoperative and postoperative RNFL thickness. The implicit times of the a-waves and b-waves were significantly prolonged, and the ΣOPs amplitude was significantly decreased postoperatively in all groups. These ERG changes were not significantly different among the groups. The postoperative PhNR amplitudes were significantly lower in the ICG group than in the BBG or TA group. CONCLUSIONS: The results indicate that the PhNR may detect subclinical impairments of RGCs caused by the possible toxic effect of ICG. This finding adds to the data that BBG and TA may be safer than ICG for use during MH surgery.

Background diseases and the number of previous intravitreal aflibercept injections on immediate intraocular pressure increase and vitreous reflux rate in phakic eyes.

AIM: To evaluate the effect of background diseases and number of previous intravitreal aflibercept injections (IVAIs) on immediate intraocular pressure (IOP) increase and vitreous reflux (VR) rate and to evaluate the correlation of both age and axial length with immediate IOP increase and VR rate. METHODS: This study included 105 patients with cystoid macular edema secondary to retinal vein occlusion, 35 patients with diabetic macular edema, 69 patients with neovascular age-related macular degeneration (nAMD), and 12 patients with myopic choroidal neovascularization, which underwent first-time IVAI. The correlation of immediate IOP increase and VR rates with the four background diseases was investigated. Moreover, the correlation of age with immediate IOP increase and VR rate as well as correlation of axial length with immediate IOP increase and VR rate were evaluated. Further, 54 patients with nAMD were treated with IVAI>10 times (multiple IVAIs). Moreover, the correlation of immediate IOP increase and VR rates with first-time and multiple IVAIs in nAMD was determined. RESULTS: The immediate IOP increase (P=0.16) and VR rates (P=0.50) were almost similar among the four background diseases. The immediate postinjection IOP and age, VR rate and age, immediate postinjection IOP and axial length, or VR rate and axial length were not correlated in the four background diseases. The immediate IOP increase (P=0.66) and VR rates (P=0.28) did not significantly differ between first-time and multiple IVAIs in nAMD. CONCLUSION: Background diseases and number of previous IVAIs have no effect on immediate IOP increase and VR rate. Further, age and axial length have no correlation on immediate IOP increase and VR rate.

Conformation of Horizontal Extraocular Muscle Insertions in Acute Acquired Concomitant Esotropia Induced by Excessive Digital Device Usage.

Purpose: Acute acquired concomitant esotropia induced by excessive digital device usage, especially smartphones (SAACE), has been increasing over the past few years. Convergence spasm induced by excessive near work has been suggested as a mechanism. Anatomical differences could also potentially contribute to SAACE onset. The present study investigated the conformation of horizontal recti between SAACE patients and normal subjects. Patients and Methods: In 15 SAACE patients (SAACE group), the distances between the limbus and insertion of the horizontal recti (LI distance) and the widths of horizontal recti on the insertion (insertion width) were measured. The control group consisted of 30 patients who underwent retinal detachment surgery. Differences in LI distances and insertion widths were compared between SAACE and control groups. Results: While there were no differences between the two groups for LI distances and insertion widths of lateral recti, there were significantly shorter LI distances for the medial recti in the SAACE group (P<0.05). Moreover, the SAACE group tended to exhibit larger insertion widths of the medial recti. Medial/lateral ratio of LI distances were significantly lower and insertion widths were significantly higher in the SAACE compared to the control group (P<0.05). Conclusion: Based on the observations of more anterior insertion and larger muscle widths, this suggests there are stronger forces of medial recti in SAACE. In addition to excessive accommodation followed by increases in medial recti tonus, the results also suggest that an anatomical imbalance between lateral and medial recti contributes to esotropia onset following excessive near work.

Effect of the COVID-19 pandemic on Vogt-Koyanagi-Harada disease.

To determine the disease prevalence rate and clinical characteristics of Vogt-Koyanagi-Harada (VKH) disease among new patients before and after the declaration of a state of emergency (April 7, 2020) in Japan. New patients and patients with newly diagnosed VKH disease were categorized into "Before" and "After" groups based on the initial visit. The prevalence rate, sex ratio, and age of patients newly diagnosed with VKH were compared between the groups. Best-corrected visual acuity (BCVA) and recurrence rates were compared among 59 patients observed for > 12 months after receiving pulse steroid therapy. For reference, we also examined the prevalence rate of patients newly diagnosed with acute angle closure (AAC) in the Before and After groups. The prevalence rates of VKH disease among newly diagnosed patients (P < 0.05) or patients with AAC (P < 0.001) were significantly higher in the After group. No significant differences in sex ratio or age of VKH disease were observed in both groups. BCVA and recurrence rates showed no significant differences. The COVID-19 pandemic increased the prevalence of VKH disease among new patients compared with that of AAC. However, the clinical features of VKH disease were unlikely affected by the COVID-19 pandemic.

Contribution of N-methyl-DL-aspartic acid (NMDA)-sensitive neurons to generating oscillatory potentials in Royal College of Surgeons rats.

PURPOSE: We investigated how the N-methyl-DL-aspartic acid (NMDA) receptor contributes to generating oscillatory potentials (OPs) of the electroretinogram (ERG) in the Royal College of Surgeons (RCS) rat. METHODS: Scotopic ERGs were recorded from dystrophic and wild-type congenic (WT) RCS rats (n = 20 of each) at 25, 30, 35, and 40 days of age. The stimulus intensity was increased from -2.82 to 0.71 log cd-s/m(2) to obtain intensity-response function. NMDA was injected into the vitreous cavity of the right eyes. The left eyes were injected with saline as controls. The P3 obtained by a-wave fitting was digitally subtracted from the scotopic ERG to isolate the P2. For the OPs, the P2 was digitally filtered between 65 and 500 Hz. The amplitudes of OP1, OP2, OP3, and OP4 were then measured and summed and designated as ΣOPs. The implicit times of OP1, OP2, and OP3 were also measured. The frequency spectra of the OPs were analyzed using fast Fourier transform (FFT). RESULTS: The maximum ERG a- and b-waves as well as ΣOPs amplitudes reduced with age in dystrophic rats. Compared with intravitreal saline injection, administration of NMDA decreased ΣOPs amplitudes from 30 days of age in dystrophic rats, while it did not attenuate ΣOPs amplitudes in WT rats. The implicit times of the OPs of the maximum ERG were prolonged by NMDA injections in WT and dystrophic rats. NMDA/saline ratios of ΣOPs amplitudes area under the FFT curves were significantly lower in dystrophic rats from 30 days of age than that in WT rats. CONCLUSION: In the early stage of photoreceptor degeneration, intravitreal NMDA injection attenuated OPs amplitudes in dystrophic rats. This indicates that NMDA receptors play a significant role in generating OPs amplitudes with advancing photoreceptor degeneration.