Glaucoma-Protective Human Single-Nucleotide Polymorphism in the Angpt2 Locus Increased ANGPT2 Expression and Schlemm Canal Area in Mice-Brief Report.

BACKGROUND: The ANGPT (angiopoietin)-TEK (tyrosine kinase, endothelial) vascular signaling pathway plays a key role in the formation of Schlemm canal, and loss-of-function mutations in the TEK or ANGPT1 gene are associated with primary congenital glaucoma in children. In genome-wide association studies, an association was identified between protection from primary open-angle glaucoma and the single-nucleotide polymorphism rs76020419 (G>T), located within a predicted miR-145-binding site in the 3' untranslated region of ANGPT2. To date, the functional impact of this variant in the anterior chamber of the eye remains largely unexplored. METHODS: MT (mutant) mice harboring an orthologous rs76020419 minor allele (T) were generated using CRISPR/Cas9 (clustered regularly interspaced short palindromic repeats/clustered regularly interspaced short palindromic repeat-associated 9). Plasma and tissue samples, including eyes, were collected, and ANGPT2 expression was quantified using ELISA. Anterior segments from eyes were collected from WT (wild-type) and MT mice, and Schlemm canal area was quantified. RESULTS: In the MT group, higher ANGPT2 concentrations were observed in the plasma, lungs, kidneys, and eyes (P=0.0212, P<0.001, P=0.0815, and P=0.0215, respectively). Additionally, the Schlemm canal was larger in MT mice compared with WT mice (P=0.0430). CONCLUSIONS: The rs76020419 minor allele (T) is associated with increased levels of ANGPT2 and a larger Schlemm canal in mice. These findings suggest a potential protective mechanism in glaucoma.

Factors associated with intrachoroidal cavitation and sinkhole formation in eyes with glaucomatous visual-field defects.

PURPOSE: To investigate factors associated with intrachoroidal cavitation (ICC) and sinkhole formation in eyes with glaucomatous visual-field defects. METHODS: This retrospective, cross-sectional study enrolled a total of 2808 eyes of 1482 patients who were diagnosed/treated for glaucoma and underwent swept-source optical coherence tomography (OCT). We first determined the prevalence of ICCs and sinkholes and their locations. Next, we selected one eye from each patient and compared the clinical characteristics of eyes with and without ICCs. Finally, in eyes with ICCs, we compared the clinical characteristics of eyes with and without sinkholes. Blood flow (BF), represented by laser speckle flowgraphy-measured tissue-area mean blur rate (MBR), was measured in the temporal optic nerve head (ONH), temporal peripapillary chorioretinal atrophy (PPA) zone, and in the ICC zone. ICC area and angle were analyzed in OCT en-face images. Mean deviation and total deviation in the central area (TD-central) were measured with Humphrey visual-field testing. RESULTS: A total of 86 eyes (3.1%) had ICCs and 52 eyes (1.9%) had sinkholes. ICC eyes had a lower spherical equivalent and longer axial length (AL) than non-ICC eyes (P < 0.05). Patients with eyes with sinkholes were more elderly and had worse best-corrected visual acuity, worse TD-central, a larger ICC, and lower tissue-area MBR in the temporal ONH, temporal PPA zone, and ICC zone (P < 0.05). CONCLUSION: In eyes with glaucoma, AL elongation might be linked to ICC formation. Sinkhole formation might be associated with ICC enlargement, impaired ocular BF, and impaired retinal structure and function involving the central area.

The association between intraocular pressure dynamics during dark-room prone testing and intraocular pressure over a relatively long-term follow-up period in primary open-glaucoma patients.

PURPOSE: To investigate the relationship between the dynamics of intraocular pressure (IOP) during dark-room prone testing (DRPT) and IOP over a relatively long-term follow-up period. METHODS: This retrospective study enrolled 84 eyes of 51 primary open-angle glaucoma patients who underwent DRPT for whom at least three IOP measurements made using Goldmann applanation tonometry were available over a maximum follow-up period of two years. We excluded eyes with a history of intraocular surgery or laser treatment and those with changes in topical anti-glaucoma medication during the follow-up period. In DRPT, IOP was measured in the sitting position, and after 60 min in the prone position in a dark room, IOP was measured again. In this study, IOP fluctuation refers to the standard deviation (SD) of IOP, and IOP max indicates the maximum value of IOP during the follow-up. The relationship between these parameters was analyzed with a linear mixed-effects model, adjusting for clinical parameters including age, gender, and axial length. RESULTS: IOP increased after DRPT with a mean of 6.13 ± 3.55 mmHg. IOP max was significantly associated with IOP after DRPT (ß = 0.38; p < 0.001). IOP fluctuation was significantly associated with IOP change in DRPT (ß = 0.29; p = 0.007). CONCLUSION: Our findings suggest that short-term and relatively long-term IOP dynamics are associated. Long-term IOP dynamics can be predicted by DRPT to some extent.

Predictive potential of optical coherence tomography parameters for the prognosis of decreased visual acuity after trabeculectomy in open-angle glaucoma patients with good vision.

BACKGROUND: Trabeculectomy (trab) is the most effective surgical procedure for lowering IOP and preventing glaucoma progression. However, decline in best-corrected visual acuity (BCVA) is one of the most serious postoperative complications of trab. Here, we investigated methods to predict decreased BCVA after trab in glaucoma patients with good preoperative BCVA. METHODS: This study included 35 eyes of 35 open-angle glaucoma (OAG) patients (male / female: 21 / 14, age: 64.0 ± 9.7 years old, preoperative intraocular pressure: 15.9 ± 5.4 mmHg, mean deviation: -18.1 ± 5.6 dB) with preoperative BCVA of 0.7 or better who underwent trab and were observed for more than 12 months. As a preoperative analysis, we measured temporal quadrant circumpapillary retinal nerve fiber layer thickness (cpRNFLT) and ganglion cell complex thickness in a central strip between the disc and fovea (csGCCT), an area that corresponds to the location of the papillomacular bundle (PMB) in swept-source optical coherence tomography (OCT). We defined BCVA decline as a loss of more than 3 lines of BCVA after 12 months. Measurement parameters were compared between the BCVA-decline group and the non-BCVA-decline group. RESULTS: BCVA decline was detected in 11 cases (31.4%) 12 months after trab. There was a statistically significant difference in axial length (P = 0.049). A single logistic analysis showed that the BCVA-decline group had significantly lower cpRNFLT than the non-BCVA-decline group (27.7 ± 8.0 µm vs. 45.1 ± 5.3 µm, P < 0.001, cut-off value: 33.4 µm), as well as lower csGCCT (72.4 ± 7.7 µm vs. 87.5 ± 5.1 µm, P = 0.002, cut-off value: 82.3 µm). Multivariable logistic analysis showed that the BCVA-decline group had significantly lower temporal quadrant cpRNFLT (P < 0.001) and lower middle csGCCT (P < 0.001) compared to the non-BCVA-decline group. CONCLUSIONS: Lower temporal quadrant cpRNFLT and middle csGCCT, OCT scan areas that correspond to the location of the PMB, might be biomarkers that predict BCVA decline after trab in OAG patients with good vision.

Vasoreactivity of the optic nerve head, nailfold, and facial skin in response to cold provocation in normal-tension glaucoma patients.

BACKGROUND: The dysfunction of optic nerve head (ONH) hemodynamics has been suggested to be involved in the pathogenesis of normal-tension glaucoma (NTG). The aim of this study was to compare vasoreactivity in the ONH, nailfold, and facial skin in response to cold-water provocation in NTG patients and healthy controls. METHODS: We performed cold-water provocation in 14 eyes of 14 NTG patients and 15 eyes of 15 age-matched control subjects. Laser speckle flowgraphy-derived tissue-area mean blur rate (MT), skin blood flowmetry-derived pulse wave amplitude (PA), nailfold capillaroscopy-derived nailfold capillary diameter, and other clinical parameters were recorded at baseline and 4 and 6 min after the cold stimulus. We compared changes (as percentages) in these variables in the NTG and control subjects with a linear mixed-effects model and evaluated correlations between these changes with Spearman's rank correlation coefficient. RESULTS: The interaction term between the NTG group (reference, control group) and the 4-min protocol step (reference, baseline) significantly affected the changes in MT, nailfold capillary diameter and PA (ß = -9.51%, P = 0.017, ß = -20.32%, P = 0.002; ß = + 18.06%, P = 0.017, respectively). The change in MT was positively correlated with the change in nailfold capillary diameter, and negatively correlated with the change in PA (r = 0.39, P = 0.036; r = -0.40, P = 0.031, respectively). CONCLUSION: NTG patients showed abnormal vasoconstriction in the ONH and nailfold and vasodilation in the facial skin in response to cold-water provocation.

Time-Course Changes in Optic Nerve Head Blood Flow and Retinal Nerve Fiber Layer Thickness in Eyes with Open-angle Glaucoma.

PURPOSE: To determine whether decreased optic nerve head (ONH) blood flow (BF) precedes or follows decreased circumpapillary retinal nerve fiber layer thickness (cpRNFLT) in eyes with open-angle glaucoma (OAG). DESIGN: Retrospective, longitudinal study. PARTICIPANTS: This study followed up 350 eyes of 225 OAG patients for at least 2 years and collected data from each patient from at least 5 examinations obtained with laser speckle flowgraphy (LSFG) and OCT. METHODS: In the superior, temporal, and inferior ONH quadrants, tissue area mean blur rate (MT), representing ONH tissue BF, was measured with LSFG, whereas cpRNFLT was measured with OCT. A multivariate linear mixed-effects model was used to identify potential predictors of faster MT decrease, adjusting for possible confounding factors. Based on these results, each quadrant of each patient was assigned a risk point if the quadrant was the superior or temporal, if patient age was older than the median (61 years), and if patient pulse rate was higher than median (74 beats per minute). The quadrants were then compared with a mixed-effects Cox model for MT and cpRNFLT changes, defined as a difference between the baseline value and the values from the latest 2 consecutive follow-up visits of more than 1.96 × the corresponding coefficient of variation. MAIN OUTCOME MEASURES: Ophthalmic and systemic variables and MT and cpRNFLT in the superior, temporal, and inferior quadrants. RESULTS: The multivariate model showed that MT decrease was faster in older patients with higher pulse rate and slower in inferior quadrants (P < 0.05). Quadrants with 0 risk points showed primary cpRNFLT decrease (P = 0.048), 1-risk point quadrants showed simultaneous cpRNFLT and MT decrease (P = 0.260), and 2-risk point and 3-risk point quadrants showed primary MT decrease (P < 0.001). CONCLUSIONS: Older patients with higher pulse rate are at greater risk of a primary reduction in ONH tissue BF, that is, preceding cpRNFLT decrease, in the superior and temporal quadrants.

A pyruvate dehydrogenase kinase inhibitor prevents retinal cell death and improves energy metabolism in rat retinas after ischemia/reperfusion injury.

We aimed to assess the neuroprotective effect of a pyruvate dehydrogenase kinase (PDK) inhibitor, Nov3r after ischemia/reperfusion (IR) injury in rats. IR injury was induced by applying 150 mmHg of intraocular pressure for 50 min. Nov3r was orally administered (100 mg/kg) 3 h before and 24 h after IR injury. TUNEL-positive cells increased and immunoreactive RBPMS-positive cells decreased in the rat retinas after IR injury. Administration of Nov3r significantly ameliorated the increase in TUNEL-positive cells and prevented the RBPMS-positive cell decrease. Similarly, the number of IR-induced Iba1-positive microglial cells was significantly reduced with Nov3r treatment. Among metabolic parameters, IR damage induced the elevation of lactate and pyruvate, and the reduction of ATP. Oral administration of Nov3r ameliorated these changes. Our data suggest that the Nov3r had a retinal neuroprotective effect in IR injury in rats. This finding suggests that the regulation of pyruvate dehydrogenase (PDH) activity has potential therapeutic value by enabling metabolic reprograming in diseases associated with ischemic retinal damage, such as diabetic retinopathy, retinopathy of prematurity, retinal vein occlusion, ischemic optic neuropathy and glaucoma.

Endogenous Fusarium Endophthalmitis During Treatment for Acute Myeloid Leukemia, Successfully Treated with 25-Gauge Vitrectomy and Antifungal Medications.

Endogenous fungal endophthalmitis (EFE) caused by disseminated fusariosis is a rare condition that generally has a poor outcome, even with intensive therapy. Here, we describe a case in which this type of EFE was diagnosed with vitreous sampling and was successfully treated with 25-gauge vitrectomy and antifungals, including liposomal amphotericin B and voriconazole. A 16-year-old male patient undergoing treatment for acute myeloid leukemia complained of eye pain and blurred vision in his right eye. Treatment was initiated for a vitreous opacity, possibly associated with herpetic retinitis, but the patient worsened and he was referred to us. Right-eye visual acuity was limited to light perception. We suspected endogenous endophthalmitis and performed 25-gauge vitrectomy with antibiotic perfusion of ceftazidime, vancomycin, and voriconazole. Vitreous culturing revealed the presence of Fusarium solani species complex, and enhanced computed tomography revealed disseminated fusariosis lesions in the lung, spleen, and the soft tissue of the left upper arm. The patient received antifungal treatment with liposomal amphotericin B and voriconazole, and these conditions were eliminated. Visual acuity recovered to 20/400 after additional vitrectomy for tractional retinal detachment and was maintained at this level during the 6-month follow-up period. The success of our treatment allowed the capture of optical coherence tomography images of the retina during fusarium-associated endogenous endophthalmitis and the follow-up period. Furthermore, this case showed that immediate vitrectomy for suspected EFE and intensive treatment can lead to a good clinical outcome.

Relationship between laser speckle flowgraphy and optical coherence tomography angiography measurements of ocular microcirculation.

PURPOSE: The purpose of this study was to investigate the relationship between laser speckle flowgraphy (LSFG) and optical coherence tomography angiography (OCTA) measurements of ocular microcirculation in normal and open-angle glaucoma (OAG) subjects. METHODS: This study included 18 eyes of 18 OAG patients and ten eyes of ten age-matched healthy controls. LSFG was used to measure mean blur rate (MBR) in the optic nerve head (ONH) vessel area (MV) and tissue area (MT). OCTA was used to measure a new parameter, peripapillary relative intensity (PRI), in the superficial retina, superficial choroid, and deep choroid. Statistical associations were then determined. RESULTS: MV, MT, superficial-retinal PRI, and superficial-choroidal PRI were lower in the OAG subjects than the controls (P = 0.02, P < 0.001, P = 0.02 and P = 0.008, respectively). Superficial-retinal PRI was correlated with MV and MT (R = 0.68, P < 0.001 and R = 0.63, P < 0.001, respectively). Superficial-choroidal PRI was also correlated with MV and MT (R = 0.45, P = 0.02 and R = 0.57, P = 0.002, respectively). Multiple regression analysis revealed that MV and MT independently contributed to superficial-retinal PRI (P = 0.008 and P = 0.04, respectively), while only MT contributed to superficial-choroidal PRI (P = 0.03). CONCLUSIONS: Our finding that OCTA-measured PRI was related to LSFG-measured MBR was reasonable, considering the vascular anatomy of the eye. Thus, PRI, like MBR, may be a promising biomarker of ocular microcirculation that can reveal the presence of ocular diseases such as OAG.

Severe demyelination but no astrocytopathy in clinically definite neuromyelitis optica with anti-myelin-oligodendrocyte glycoprotein antibody.

We report a patient with neuromyelitis optica (NMO) presenting anti-myelin-oligodendrocyte glycoprotein (MOG)-seropositive, in whom biomarkers of demyelination and astrocyte damage were measured during an acute attack. A 31-year-old man developed right optic neuritis followed by longitudinally extensive transverse myelitis, fulfilling the criteria for definite NMO. He was anti-MOG-seropositive and anti-aquaporin-4 seronegative. The myelin basic protein level was markedly elevated whereas glial fibrillary acidic protein was not detectable in cerebrospinal fluid during an acute attack. His symptoms quickly improved after high-dose methylprednisolone therapy. This case suggests that NMO patients with anti-MOG may have severe demyelination in the absence of astrocyte injury.

Differentiating optic neuropathies using laser speckle flowgraphy: Evaluating blood flow patterns in the optic nerve head and peripapillary choroid.

PURPOSE: To compare blood flow (BF) impairment patterns in different optic neuropathies using laser speckle flowgraphy (LSFG). METHODS: This retrospective study enrolled 24 eyes of 24 patients with non-arteritic anterior ischemic optic neuropathy (NAAION), 59 eyes of 59 patients with optic neuritis (ON), 677 eyes of 677 patients with open-angle glaucoma (OAG), and 110 eyes of 110 controls. The patient backgrounds of all groups were compared. Ophthalmologic findings were evaluated, adjusting for age, sex, blood pressure, pulse rate, and underlying systemic diseases with 1:1 optimal propensity score matching. We used LSFG to obtain optic nerve head (ONH) vessel-area mean blur rate (MBR; ONH-MV), ONH tissue-area MBR (ONH-MT), and choroidal MBR. The NAAION and ON groups were compared with the control and OAG groups. RESULTS: Best-corrected visual acuity was worse in the NAAION, ON, and OAG groups than in controls (p < 0.001). Circumpapillary retinal nerve fibre layer thickness was higher in the NAAION and ON groups and lower in the OAG group than in controls (p < 0.001). Compared to controls, the NAAION and OAG groups had significantly lower ONH-MV, ONH-MT, and choroidal MBR (p < 0.05). Additionally, the NAAION group had lower ONH-MV and choroidal MBR than the OAG group (p = 0.003 and p < 0.001, respectively) but no difference in ONH-MT (p = 0.857). The ON group had significantly lower ONH-MV and choroidal MBR compared to the controls (p < 0.001 and p = 0.022, respectively) but no difference in ONH-MT (p = 0.773). CONCLUSION: Optic neuropathies showed different patterns of ocular BF impairment. Therefore, LSFG can be a useful tool for differentiating optic neuropathies.

Comparative features of superior versus inferior hemisphere microvasculature dropout in open-angle glaucoma.

PURPOSE: This study aimed to investigate differences in microvasculature dropout (MvD) between the superior and inferior hemispheres in glaucoma patients. STUDY DESIGN: Retrospective and cross-sectional. METHODS: Fifty-eight eyes of 58 open-angle glaucoma patients (age 61.12 ± 10.19 years, mean deviation - 7.32 ± 6.36 dB) were included. MvD was detected with en face images from swept-source optical coherence tomography angiography. Blood flow at the optic nerve head was measured with laser speckle flowgraphy, represented as the mean blur rate in tissue (MBRT). Logistic and linear regression models adjusted for age, intraocular pressure, axial length, and circumpapillary retinal nerve fiber layer thickness were used to investigate the relationship between various factors and MvD angle in each hemisphere. RESULTS: The presence of inferior MvD was related to peripapillary atrophy-ß area (odds ratio = 14.10 [2.49-234.00], P = 0.019). Superior MvD angle was significantly related to MBRT in the superior quadrant (ß = -0.31 [- 0.60 - -0.02], P = 0.037). Inferior MvD angle was significantly related to peripapillary atrophy-ß area (ß = 0.49 [0.21-0.77], P = 0.001). CONCLUSIONS: Only superior MvD demonstrated a significant relationship with reduced ocular blood flow. In contrast, inferior MvD was associated with mechanical stress. These findings may suggest a potential difference in pathophysiology between superior and inferior MvD.

The Relationship Between Artificial Intelligence-Assisted OCT Angiography-Derived Foveal Avascular Zone Parameters and Visual-Field Defect Progression in Eyes with Open-Angle Glaucoma.

Purpose: To investigate clinical factors associated with foveal avascular zone (FAZ) parameters obtained using OCT angiography (OCTA) with assistance from a previously developed artificial intelligence (AI) platform in eyes with open-angle glaucoma (OAG). Design: Retrospective longitudinal. Participants: This study followed up 885 eyes of 558 patients with OAG for ≥ 2 years; all eyes underwent ≥ 5 Humphrey visual-field (VF) tests and had 3.0 × 3.0 mm macular OCTA scans available. Methods: Average total deviation (TD) in the superior, superocentral, inferocentral, and inferior sectors of the Humphrey 24-2 program was calculated. We collected 3.0 × 3.0 mm macular OCTA images from each patient and used a previously developed AI platform with these images to obtain FAZ parameters, including FAZ area, FAZ circularity index (CI), and FAZ perimeter. Multivariable linear mixed-effects models were used to analyze the relationship between FAZ parameters, TD or TD slope in each quadrant, and systemic factors, adjusting for potential confounding factors, including axial length. Main Outcome Measures: Ophthalmic and systemic variables, FAZ parameters, and TD or TD slope in each quadrant. Results: The multivariable model showed that FAZ parameters were correlated with both TD and TD slope in the inferocentral quadrant (ß = -0.244 - 0.168, P < 0.001). Both upper-half and lower-half FAZ parameters were better associated with TD-inferocentral and TD-inferocentral slope than TD-superocentral or TD-superocentral slope in terms of ß size and statistical significance, indicating that there was no evident vertical anatomical correspondence between TD in the central quadrant and FAZ parameters. Foveal avascular zone area enlargement was associated with female gender (ß = 0.242, P = 0.003). Loss of FAZ circularity was associated with both aging and comorbid sleep apnea syndrome (SAS) (yes: 1, no: 0) (ß = -0.188, P < 0.001; ß = -0.261, P = 0.031, respectively). Foveal avascular zone perimeter elongation was associated with aging and female gender (ß = 0.084, P = 0.040; ß = 0.168, P = 0.042, respectively). Conclusions: Artificial intelligence-assisted OCTA-measured FAZ enlargement and irregular shape might be good markers of ocular hypoperfusion and associated inferocentral VF defect progression in eyes with OAG. Financial Disclosure(s): The author(s) have no proprietary or commercial interest in any materials discussed in this article.

The Effect of ß-Blocker Eye Drops on Pulse Rate, Ocular Blood Flow, and Glaucoma Progression: A Retrospective Longitudinal Study.

INTRODUCTION: Our study was conducted to determine factors associated with the effectiveness of a ß-blocker eye drop add-on in altering pulse rate (PR) in glaucoma patients. METHODS: This retrospective study examined 236 eyes of 138 patients who received a ß-blocker eye drop add-on during follow-up. Patients were included if at least one PR measurement was available both before and after the add-on was started. We collected data on ophthalmic parameters: longitudinal PR; longitudinal choroidal blood flow, represented by laser speckle flowgraphy-measured mean blur rate (MBR); and diacron-reactive oxygen metabolites (d-ROMs). We used a multivariable linear mixed-effects model to investigate the effectiveness of the ß-blocker eye drop add-on in altering PR and examined factors contributing to a larger PR alteration after the add-on was started by analyzing the effect on PR of the interaction term between the add-on and clinical factors. We used the k-means method to classify the patients. RESULTS: The ß-blocker eye drop add-on reduced PR (- 7.61 bpm, P < 0.001). Female gender, higher PR when the add-on was started, lower central corneal thickness, and a higher d-ROM level were associated with greater reduction in PR (P < 0.05). In a cluster of patients with these clinical features, choroidal MBR increased by + 3.42% when we adjusted for change over time; MD slope, which represents the speed of glaucoma progression, improved by + 0.64 dB/year (P < 0.05). CONCLUSIONS: We identified a glaucoma subgroup in which PR decreased, choroidal blood flow increased, and glaucoma progression slowed after a ß-blocker eye drop add-on was started.

Sector-specific Association of Intraocular Pressure Dynamics in Dark-room Prone Testing and Visual Field Defect Progression in Glaucoma.

PURPOSE: To investigate sectoral differences in the relationship between intraocular pressure (IOP) dynamics during dark-room prone testing (DRPT) and visual field (VF) defect progression in primary open-angle glaucoma (POAG) patients. DESIGN: Retrospective, longitudinal study. PARTICIPANTS: This retrospective study included 116 eyes of 84 POAG patients who underwent DRPT and had at least 5 reliable VF tests conducted over a more than 2-year follow-up period. We excluded eyes with mean deviation worse than -20 dB or a history of intraocular surgery or laser treatment. METHODS: Average total deviation (TD) was calculated in the superior, central, and inferior sectors of the Humphrey 24-2 or 30-2 program. During DRPT, IOP was measured in the sitting position, and after 60 minutes in the prone position in a dark room, IOP was measured again. The relationship between IOP change during DRPT, IOP after DRPT, and TD slope in each quadrant was analyzed with a linear mixed-effects model, adjusting for other potential confounding factors. MAIN OUTCOME MEASURES: Total deviation slope in each quadrant, IOP change during DRPT, and IOP after DRPT. RESULTS: Intraocular pressure after DRPT and IOP change during DRPT were 18.16 ± 3.42 mmHg and 4.92 ± 3.12 mmHg, respectively. Superior TD slope was significantly associated with both IOP after DRPT (ß = -0.28, P = 0.003) and IOP change during DRPT (ß = -0.21, P = 0.029), while central (ß = -0.05, P = 0.595; ß = -0.05; P = 0.622) and inferior (ß = 0.05, P = 0.611; ß = 0.01, P = 0.938) TD slopes were not. CONCLUSION: Dark-room prone testing might be a useful test to predict the risk of superior VF defect progression in eyes with POAG. FINANCIAL DISCLOSURE(S): The author(s) have no proprietary or commercial interest in any materials discussed in this article.

The effect of a brinzolamide/brimonidine fixed combination on optic nerve head blood flow in rabbits.

PURPOSE: The purpose of this study was to investigate the effect of a 1% brinzolamide and 0.1% brimonidine fixed combination (BBFC) on ONH blood flow (BF) in rabbits. METHODS: A crossover study was conducted on pigmented rabbits; a physiological saline solution, brinzolamide, or BBFC was administered for eight days. ONH BF, intraocular pressure (IOP) and systemic parameters were measured before the eighth day's first dose and at 6, 9, 12, and 14 hours after the dose. ONH BF was assessed using laser speckle flowgraphy, and mean blur rate (MBR) values were calculated. The percentage against baseline of each parameter was calculated, and intergroup comparisons were performed at each time point. RESULTS: There were no significant differences in the percentage change in systemic parameters. At 6 hours after administration, the BBFC group showed a significantly higher percentage change in large vessel area-MBR (%MV) compared to the control group (98.6±16.8%MV vs. 81.3±7.9%MV, P = 0.03). On the other hand, the brinzolamide group did not show a significant difference. Both the brinzolamide and BBFC groups had significantly lower percentage change in IOP (%IOP) compared to the control group (90.6±5.0%IOP, 93.3±2.9%IOP, and 99.2±1.7%IOP, respectively, P < 0.01). CONCLUSION: BBFC effectively reduces IOP and mitigates diurnal fluctuation-induced decreases in ONH BF.

The Relationship Between Kiritsu-Meijin-Derived Autonomic Function Parameters and Visual-Field Defects in Eyes with Open-Angle Glaucoma.

PURPOSE: This retrospective cross-sectional study aimed to investigate the association between autonomic parameters measured using the Kiritsu-Meijin device and visual-field defects in patients with open-angle glaucoma. METHODS: A total of 79 eyes of 42 patients with open-angle glaucoma were enrolled in this study. Kiritsu-Meijin testing comprised three phases: sitting, standing, and sitting again (2 min, 2 min, and 1 min, respectively). Continuous electrocardiograms were recorded for five minutes. Autonomic parameters were extracted from the resulting data and analyzed, including activity, balance, reaction, switchover, and recovery; these are five representative parameters derived from Kiritsu-Meijin testing. Correlations between these parameters and mean deviation from Humphrey visual field testing were determined. Additionally, we used a linear mixed-effects model to observe sectoral differences in the relationship between total deviation and the Kiritsu-Meijin parameters. In this study, we focused on superior, central, and inferior total deviations. RESULTS: Significant positive correlations were observed between activity, balance, and recovery and mean deviation values (ß = 0.29-0.38, p < .05). The ß value between activity and inferior total deviation was higher than that between activity and superior total deviation (ß = 0.22, p < .05). Balance did not show any sectoral differences (p > .05). Recovery was more strongly associated with central to inferior total deviation than superior total deviation (ß = 0.17-0.25, p < .05). CONCLUSION: Our findings suggest that in patients with open-angle glaucoma, lower activity and recovery are associated with more severe central and/or inferior visual field defects in the superior quadrant. These results imply that measurements of autonomic function made with the Kiritsu-Meijin device may have clinical utility in the management of glaucoma.

A ginger extract improves ocular blood flow in rats with endothelin-induced retinal blood flow dysfunction.

The aim of this study was to investigate the effect of a ginger extract on optic nerve head blood flow (ONH BF) under endothelin-1 (ET-1) stimulation. Using laser speckle flowgraphy, we measured ONH BF in brown Norway rats. To establish the ONH BF impairment profile under ET-1 stimulation, we administered an intravitreal injection of ET-1 under anesthesia. We then gave the ginger extract sublingually to assess its effect on ONH BF in both normal and ET-1-induced ischemic conditions. Post ET-1 injection, there were no significant changes in parameters including intraocular pressure or systemic factors. ONH BF showed a dose-dependent decline after ET-1 injection, with a significant reduction after a 2.50 pmol ET-1 dose. Sublingual administration of the ginger extract significantly improved ONH BF in both normal and ET-1-stimulated rats. This suggests that our newly developed supplement for improving ONH BF has a potential role in retinal ischemic diseases, including glaucoma.

Factors Associated With Visual Acuity Decline in Glaucoma Patients With Loss of Ganglion Cell Complex Thickness.

Purpose: To investigate the association between ocular/systemic factors and visual acuity decline in glaucoma patients with loss of ganglion cell complex thickness (GCCT). Methods: In 515 eyes of 515 patients with open-angle glaucoma (mean age, 62.6 ± 12.8 years; mean deviation, -10.95 ± 9.07 dB), we used swept-source optical coherence tomography to measure macular GCCT in sectors classified as corresponding to circumpapillary retinal nerve fiber layer clock-hour sectors from 7 o'clock (inferotemporal) to 11 o'clock (superotemporal). We calculated Spearman's rank correlation coefficient between each sector and best-corrected visual acuity (BCVA), determined cutoff values for BCVA decline (<20/25), and used multivariable linear regression models to determine the correlation between BCVA and biological antioxidant potential (BAP), corneal hysteresis (CH), and temporal-tissue optic nerve head blood flow (represented by temporal mean blur rate, or MBR-T). Results: Macular GCCT corresponding to the 9 o'clock sector had the highest correlation with BCVA (Rs = -0.454; P < 0.001) and a cutoff of 76.17 µm (area under the receiver operating characteristic curve = 0.891; P < 0.001). Subjects below this cutoff (N = 173) showed significant correlations between BCVA and age, BAP, CH, and MBR-T (ß = 0.192, P = 0.033; ß = -0.186, P = 0.028; ß = -0.217, P = 0.011; and ß = -0.222, P = 0.010, respectively). Conclusions: Multiple factors are involved in BCVA decline in patients with glaucoma with decreased macular GCCT. This suggests that evaluating BCVA may require assessing multiple factors. Translational Relevance: Multiple factors contribute to BCVA decline.

Effects of constitutively active K-Ras on axon regeneration after optic nerve injury.

Visual disturbance after optic nerve injury is a serious problem. Attempts have been made to enhance the intrinsic ability of retinal ganglion cells (RGCs) to regenerate their axons, and the importance of PI3K/Akt and RAF/MEK/ERK signal activation has been suggested. Since these signals are shared with oncogenic signaling cascades, in this study, we focused on a constitutively active form of K-Ras, K-RasV12, to determine if overexpression of this molecule could stimulate axon regeneration. We confirmed that K-RasV12 phosphorylated Akt and ERK in vitro. Intravitreal delivery of AAV2-K-RasV12 increased the number of surviving RGCs and promoted 1.0 mm of axon regeneration one week after optic nerve injury without inducing abnormal proliferative effects in the RGCs. In addition, AAV2-K-RasV12 induced robust RGC axon regeneration, reaching as far as approximately 2.5 mm from the injury site, in eight weeks. Our findings suggest that AAV2-K-RasV12 could provide a good model for speedy and efficient analysis of the mechanism underlying axon regeneration in vivo.