Characteristics of Cellular Infiltration into Posterior Vitreous in Eyes with Uveitis on the Classification Basis Assessed Using Optical Coherence Tomography.

Purpose: To evaluate the characteristics of posterior vitreous cells in patients with uveitis on the classification basis using spectral domain optical coherence tomography (SD-OCT). Methods: In this retrospective chart review, all eyes were classified into three groups: infectious uveitis (IFU, n=7), noninfectious granulomatous uveitis (NIGU, n=13), and noninfectious nongranulomatous uveitis (NINGU, n=13). We measured the size, number, and density of vitreous hyperreflective particles in the posterior vitreous area that was defined as the space between the vitreous top and the internal limiting membrane on OCT. The correlations between vitreous haze and vitreous particles were also evaluated. Results: Thirty-three eyes from 23 patients with active posterior uveitis were included. IFU had significantly more particles than NIGU and NINGU (P=0.03 and P<0.001, respectively). The vitreous particle density was higher in IFU than in NIGU and NINGU (P=0.03 and P=0.003, respectively). The mean largest particle size was greater in IFU and NIGU than in NINGU (P=0.01 and P=0.03, respectively). The median vitreous haze of 2+ in IFU, 1+ in NIGU and NINGU showed no significant difference among three groups (P=0.21). Conversely, the correlation of the largest particle size with vitreous haze was significant at ρ= 0.44 (P=0.01). Conclusion: SD-OCT may be useful for assessing ocular inflammation based on morphological characteristics of vitreous particles on the uveitis classification basis.

Outcomes of Microhook ab Interno Trabeculotomy in Consecutive 36 Eyes with Uveitic Glaucoma.

Microhook trabeculotomy (µLOT), recently developed by Tanito belongs to minimally invasive glaucoma surgery and contributes to intraocular pressure (IOP) control in eyes with glaucoma resistant to medical therapy. In this study, we aimed to investigate the effectiveness and safety of µLOT for uveitic glaucoma. The medical records of consecutive 36 eyes from 30 patients who underwent µLOT and were followed up over post-operative 1 year were reviewed. The surgical success (IOP = 5-20 mmHg and ΔIOP ≥ 20% with additional anti-glaucoma drugs) was achieved in 67% of eyes at post-operative 12 months. The median IOP significantly decreased from 30.5 mmHg pre-operatively to 15 mmHg at 12 months post-operatively (p = 0.001), and the median glaucoma drug score changed from 5 pre-operatively to 2.5 at 12 months post-operatively (p = 0.301). Intraocular inflammation scores at post-operative 6 weeks did not show a significant worsening as compared to pre-operatively, and 8 (22%) eyes exhibited exacerbation of inflammation during the 12-month follow-up period. Post-operative complications were confirmed in 58% of eyes, but most of them were mild and transient or successfully managed. With its favorable benefit-risk profile, µLOT would be an option worth considering as the first glaucoma surgery for uveitic glaucoma.

Outcomes of Primary 27-Gauge Vitrectomy for 73 Consecutive Cases With Uveitis-Associated Vitreoretinal Disorders.

Background: Since the advent of 27-gauge microincision vitrectomy system a decade ago, evidence regarding the feasibility, safety, and effectiveness of 27-gauge pars plana vitrectomy (PPV) has increased. Aim: To assess the effectiveness and safety profile of 27-gauge PPV for various vitreoretinal conditions associated with uveitis. Methods: We retrospectively investigated 73 consecutive cases that underwent primary 27-gauge PPV for uveitis-related ocular disorders between October 2014 and April 2021. The primary outcome measures were mean change in logMAR best-corrected decimal visual acuity (BCVA) pre-operatively to 3 months post-operatively, the proportion of BCVA improvement category defined as the degree of logMAR BCVA difference ("improved" [≤-0.3], "unchanged" [-0.3 to 0.3], and "worsened" [≥0.3]) pre-operatively to 3 months post-operatively, the mean change in intraocular inflammation scores pre-operatively to 3 months post-operatively; and intraoperative and post-operative complications. Results: The mean logMAR BCVA significantly improved from 0.69 pre-operatively to 0.42 at 3 months post-operatively (P = 0.017). The percentages of eyes with "improved," "unchanged," and "worsened" BCVA at 3 months post-operatively were 37, 50, and 13%, respectively. The mean anterior chamber cell score was 0.6 pre-operatively and 0.2 at 3 months post-operatively (P = 0.001), the mean anterior chamber flare score was 0.4 pre-operatively and 0.1 at 3 months post-operatively (P = 0.004), and the mean vitreous haze score was 1.9 pre-operatively and 0.1 at 3 months post-operatively (P < 0.001). Surgery-related complications occurred in 35 (48%) eyes, 68% of which were related to intraocular pressure and transient. Conclusions: Given its risk-benefit profile, 27-gauge PPV is a promising option for the treatment of vitreoretinal disorders in uveitis.

Changes in Gene Expression Profiling and Phenotype in Aged Multidrug Resistance Protein 4-Deficient Mouse Retinas.

Multidrug resistance protein 4 (MRP4) is an energy-dependent membrane transporter responsible for cellular efflux of a broad range of xenobiotics and physiological substrates. In this trial, we aimed to investigate the coeffects of aging and MRP4 deficiency using gene expression microarray and morphological and electrophysiological analyses of mouse retinas. Mrp4-knockout (null) mice and wild-type (WT) mice were reared in the same conditions to 8-12 weeks (young) or 45-55 weeks (aged). Microarray analysis identified 186 differently expressed genes from the retinas of aged Mrp4-null mice as compared to aged WT mice, and subsequent gene ontology and KEGG pathway analyses showed that differently expressed genes were related to lens, eye development, vision and transcellular barrier functions that are involved in metabolic pathways or viral infection pathways. No significant change in thickness was observed for each retinal layer among young/aged WT mice and young/aged Mrp4-null mice. Moreover, immunohistochemical analyses of retinal cell type did not exhibit an overt change in the cellular morphology or distribution among the four age/genotype groups, and the electroretinogram responses showed no significant differences in the amplitude or the latency between aged WT mice and aged Mrp4-null mice. Aging would be an insufficient stress to cause some damage to the retina in the presence of MRP4 deficiency.

Three-year outcome of sulcus fixation of Baerveldt glaucoma implant surgery.

PURPOSE: The purpose of this study was to evaluate the 3-year surgical outcome of the sulcus fixation of Baerveldt glaucoma implant (BGI), focusing on corneal damage. METHODS: This prospective observational study included 37 patients who underwent a median of two previous glaucoma surgeries and sulcus fixation of BGI for the first time. Each patient's intraocular pressure (IOP), glaucoma drug score, corneal endothelial cell density (ECD), and logMAR-converted best-corrected visual acuity (VA) were measured preoperatively and postoperatively until 36 months after surgery. Complete success was defined as reduced IOP (5-21 mmHg and >20% rate), without corneal damage (postoperative development of decompensation, unmeasurable ECD, or reduction in ECD of >20%), without loss of light perception, and without additional surgery requirement. Qualified success was defined by excluding the corneal criteria from complete success. RESULTS: A total of 51% (19/37) patients experienced complete treatment success, whereas 86% (32/37) had qualified success. The median IOP (glaucoma drug score) decreased from 26 mmHg (5) to 15 mmHg (2) at three years postoperatively. The median postoperative ECD (reduction rate) decreased from 1838 cells/cm2 preoperatively to 1587 cells/mm2 (14%) at one year, 1358 cells/mm2 (26%) at two years, and 1228 cells/mm2 (33%) at three years postoperatively. One month after surgery, the VA was significantly reduced from preoperative values but did not decline after that. CONCLUSION: Sulcus fixation of BGI was effective for IOP reduction. However, ECD decreased over time.

Changes in choroidal imaging parameters following adalimumab therapy for refractory noninfectious uveitis.

PURPOSE: To evaluate the short-term change in choroidal structure following adalimumab (ADA) treatment in refractory noninfectious uveitis. METHODS: This was a retrospective study of 33 eyes from 18 patients with refractory noninfectious uveitis. Subfoveal choroidal thickness (SFCT), the choroidal stromal index (CSI) defined as the proportion of stromal area to the total choroidal area were used as choroidal imaging parameters and were evaluated by enhanced depth imaging optical coherence tomography (EDI-OCT). The change in these parameters in the 2 months following initiation of ADA was analysed. A linear mixed-effect model was used to assess the effect of ADA treatment. RESULTS: The causes of uveitis were Vogt-Koyanagi-Harada disease (VKHD) (42.4%), presumed autoimmune retinopathy (15.2%), others (12.1%) and unclassified (30.3%). In the analysis of all eyes, the SFCT was 309.7 ± 113.1 µm at baseline, 295.7 ± 114.5 µm at 1 month and 275.2 ± 98.8 µm at 2 months after ADA initiation (P < 0.001). The CSI was 0.275 ± 0.050 at baseline, 0.273 ± 0.068 at 1 month and 0.273 ± 0.046 at 2 months (P = 0.785). In the subgroup analysis, the SFCT decreased significantly from baseline to 2 months in VKHD eyes (P = 0.007) and unclassified eyes (P = 0.034). There was no significant change in CSI in either subgroup. CONCLUSIONS: In the assessment of short-term response to ADA treatment in uveitic eyes, using EDI-OCT, the SFCT appears to be more effective as a choroidal imaging biomarker than the CSI, especially in VKHD eyes.