ABSTRACT
Background: To assess the anterior scleral thickness (AST), Schlemm's canal diameter (SCD), trabecular meshwork diameter (TMD) and conjunctiva tenon capsule thickness (CTT) in high myopic (HM) subjects and HM subjects with glaucoma (HMG) compared to control eyes. Methods: One hundred and twenty eyes were included, and AST at 0, 1, 2 and 3 mm from the scleral spur, SCD, TMD and CTT were measured. Results: Mean age was 64.2 ± 11.0 years, and the temporal SCD and temporal TMD were significantly longer in the HMG subjects compared to the controls (380.0 ± 62 µm vs. 316.7 ± 72 µm, p = 0.001) and (637.6 ± 113 µm vs. 512.1 ± 97 µm, p = 0.000), respectively. There were no significant differences between the HM and HMG subjects in SCD and TMD (all p > 0.025). Compared to the HM subjects, the temporal AST0 (432.5 ± 79 µm vs. 532.8 ± 99 µm, p = 0.000), temporal AST1 (383.9 ± 64 µm vs. 460.5 ± 80 µm, p = 0.000), temporal AST2 (404.0 ± 68 µm vs. 464.0 ± 88 µm, p = 0.006) and temporal AST3 (403.0 ± 80 µm vs. 458.1 ± 91 µm, p = 0.014) were significantly thinner in the HMG group. No differences were found between the CTT in the three groups (all p > 0.025). Conclusions: Our data indicate a thinner AST in HMG subjects and no differences in SCD and TMD between HM and HMG subjects.
ABSTRACT
INTRODUCTION: The choroid and its role in posterior segment pathology has become an increasing subject of study. The objective of the present study was to analyze choroidal thickness (CT) in healthy eyes by widefield (WF) optical coherence tomography (OCT) up to the periphery and to compare the reliability of manual versus automatic measurement. METHODS: Cross-sectional and non-interventional study conducted on 191 healthy eyes of 101 patients. All patients were scanned by using WF-OCT (Xephilio WF-OCT S1; Canon Corp, Tokyo, Japan). CT was measured in 2000 µm intervals automatically using the built-in software and manually by two masked observers. All analyses were performed using the IBM-PSSS statistical software program (IBM-SPSS, v. 28.0.0.0, Chicago, IL, USA). RESULTS: CT was measured in 100% of the sample. The mean age of the study cohort was 39.05±19.06 years old. Mean subfoveal (SF)CT measured automatically was 343.67±84.18 µm and manually was 336.55±75.57 µm. The thickest point was located 2000 µm from the fovea in the superior sector in 62.83% of the subjects. According to age distribution, mean CT became significantly thinner from 40 years of age. When comparing automatic and manually measuring, the intraclass correlation coefficient was excellent (p<0.01) in all quadrants. Moreover, manual measurement interobserver agreement was excellent in all quadrants (p<0.01). CONCLUSION: The automatic system is valid and serves as the basis of choroid measurement. In more than 50% of the healthy subjects, superior CT is thicker than subfoveolar CT and mean CT became significantly thinner from 40 years of age.
