Prevalence and outcomes of cataract surgery in Brazil: the São Paulo eye study.

Purpose: To investigate the prevalence and visual acuity (VA) outcomes of cataract surgery in a low- to middle-income population in São Paulo, Brazil.

Design: Population-based, cross-sectional study.

Methods: Cluster sampling was used in randomly selecting those > or =50 years old for VA measurement, refraction, and ocular examination.

Prevalence and causes of vision impairment and blindness in older adults in Brazil: the Sao Paulo Eye Study.

Purpose: Investigate prevalence and causes of vision impairment/blindness in older adults in a low-middle income area of Sao Paulo, Brazil.

Methods: Cluster sampling, based on geographically defined census sectors, was used in randomly selecting cross-sectionally persons 50 years of age or older. Subjects were enumerated through a door-to-door survey and invited for measurement of presenting and best-corrected visual acuity and an ocular examination.

Prevalence of visual impairment, blindness, ocular disorders and cataract surgery outcomes in low-income elderly from a metropolitan region of São Paulo--Brazil.

Purpose: To determine prevalence and causes of visual impairment, blindness, ocular disorders and cataract surgery outcomes in a low-income elderly population from a metropolitan area in the city of São Paulo, Brazil.

Methods: Observational study where 801 individuals of 60 years and older underwent presented and best corrected visual acuity measurements as well as ophthalmologic examination. Definition of blindness and visual impairment followed studies conducted in Nepal, China and India.