Prevalence and causes of visual impairment and blindness in an urban Indian population: The Singapore Indian eye study

Abstract

Purpose: To describe the prevalence and causes of visual impairment and blindness in an urban Indian population. Design: Population-based study. Participants: Ethnic Indians aged more than 40 years living in Singapore. Methods: Participants underwent standardized ophthalmic assessments for visual impairment and blindness, defined using best-corrected visual acuity (BCVA) and presenting visual acuity (PVA), according to US and modified World Health Organization (WHO) definitions. Main Outcome Measures: Unilateral visual impairment or blindness was defined on the basis of the worse eye, and bilateral visual impairment or blindness was defined on the basis of the better eye. Primary causes of v..