All analyses were performed using Stata statistical software, version 9.0 (Stata Corp, College Station, Texas), and took into account the cluster design of the study using “svy” commands. People with a Mini-Mental State Examination (MMSE) score of less than 12 were excluded from these analyses because measurement of visual acuity in this group is likely to be inaccurate. The risk ratio of nursing home admission associated with visual impairment was estimated using Poisson regression. In all analyses, the reference group consisted of participants with good vision. The following potential confounding factors and effect modifiers were considered: age, sex, marital status (single, married, or widowed), living alone, housing tenure (home owner, not a home owner, or sheltered accommodation), financial difficulties (difficulties making ends meet and/or managing finances), looked after someone with a serious illness in the last year, death of a loved one in the last year, social support (no relative or friend to call on and/or no help at night), alcohol consumption (never, former drinker, currently below median, or currently above median), smoking status (never, former smoker, or current smoker), body mass index (quintiles; calculated as weight in kilograms divided by height in meters squared), depression (score of ≥6 on the Geriatric Depression Scale), having diabetes mellitus, hearing impairment (failed whispered voice test), reported major illness (heart attack, stroke, Parkinson disease, or cancer), self-reported health status (excellent or very good, good, or fair or poor), activities of daily living (ADL) score (unable to complete 0-1, 2-4, or 5-8 ADL), falls in the last 6 months (none, 1, or ≥2), self-reported activity level (very or fairly active vs not very or not at all active), and cognitive impairment (MMSE score of 12-17, 18-23, or 24-30).