Impact of Glaucoma Severity and Laterality on Vision-Specific Functioning: The Singapore Malay Eye Study

Abstract

We determined the impact of glaucoma severity and laterality on vision-specific functioning (VF) in an Asian population. The Singapore Malay Eye Study (SiMES) was a population-based cross-sectional study of 3280 Malays aged 40 to 80 years. VF was assessed using the VF-11 questionnaire. Associations between VF-11 score and glaucoma clinical indices (glaucoma severity in better and worse eyes, and laterality) were determined by multivariate regression modeling. Glaucoma severity was defined as mild, moderate, advanced, and severe based on the Hodapp-Anderson-Parish system. Rasch analysis was used to validate the VF-11 and determine its psychometric properties. Of 926 persons analyzed, 123 had glaucoma (13.3% glaucoma prevalence in analyzed sample). The mean ± SD VF score was 3.64 ± 1.05 log of odds units (Logits). In multivariate models adjusting for sociodemographic, ocular, and systemic variables, poorer VF was associated with increasingly worse eye visual field loss (β = 0.016, 95% confidence interval [CI] 0.004-0.029, P < 0.001), but not that of the better eye (P > 0.05). Compared to controls, VF was reduced in individuals with worse eye advanced and severe glaucoma (β = -0.65, 95% CI -1.03 to -0.28, P < 0.05), but not mild or moderate glaucoma (P > 0.05). Compared to controls, VF was reduced in unilateral (β = -0.29, 95% CI -0.54 to -0.04, P < 0.05), but not bilateral glaucoma (P > 0.05). These associations remained significant after adjusting for presenting and best-corrected visual acuity. Among Singaporean Malays, unilateral, and advanced and severe glaucoma in the worse eye significantly impacts on VF. Identifying early-stage glaucoma, preventing progression, and visual rehabilitation in advanced glaucoma are important aspects of glaucoma management.