Prevalence and causes of vision impairment and blindness in older adults in Brazil: the São Paulo eye study

Prevalence and causes of vision impairment and blindness in older adults in Brazil: the São Paulo eye study

Author Salomão, Solange Rios Autor UNIFESP Google Scholar
Cinoto, Rafael Werneck Autor UNIFESP Google Scholar
Berezovsky, Adriana Autor UNIFESP Google Scholar
Araujo Filho, Arnaud Autor UNIFESP Google Scholar
Mitsuhiro, Marcia R. K. H. Autor UNIFESP Google Scholar
Mendieta, Luana Autor UNIFESP Google Scholar
Morales, Paulo Henrique de Avila Autor UNIFESP Google Scholar
Pokharel, Gopal P. Google Scholar
Belfort, Rubens Junior Autor UNIFESP Google Scholar
Ellwein, Leon B. Google Scholar
Institution Universidade Federal de São Paulo (UNIFESP)
Nepal Netra Jyoti Singh
Abstract Purpose: Investigate prevalence and causes of vision impairment/blindness in older adults in a low-middle income area of São 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. the principal cause was identified for eyes with presenting visual acuity less than 20/32. Results: A total of 4,224 eligible persons in 2,870 households were enumerated, and 3,678 (87.1%) examined. the prevalence of presenting visual acuity 20/32 in both eyes was 61.6% (95% confidence interval [CI]: 59.4%-63.9%), and 80.4% (95% CI: 78.8%-82.1%) with best correction. the prevalence of visual impairment ( 20/63 to 20/200) in the better eye was 4.74% (95% CI: 3.97%-5.53%), and 2.00% (95% CI: 1.52%-2.49%) with best correction. the prevalence of presenting bilateral blindness ( 20/200) was 1.51% (95% CI: 1.20%-1.82%), and 1.07% (95% CI: 0.79%-1.35%) with best correction. Presenting blindness was associated with older age and lack of schooling. Retinal disorders (35.3%) and cataract (28.3%) were the most common causes of blind eyes. Cataract (33.2%), refractive error (32.3%), and retinal disorders (20.3%) were the main causes of vision impairment 20/63 to 20/200, with refractive error (76.8%) and cataract (12.2%) as main causes for eyes with acuity 20/32 to 20/63. Conclusions: Vision impairment is a significant problem in older Brazilians reinforcing the need to implement prevention of blindness programs for elderly people with emphasis on those without schooling.
Keywords adults
vision impairment
Language English
Date 2008-01-01
Published in Ophthalmic Epidemiology. Philadelphia: Taylor & Francis Inc, v. 15, n. 3, p. 167-175, 2008.
ISSN 0928-6586 (Sherpa/Romeo, impact factor)
Publisher Taylor & Francis Inc
Extent 167-175
Access rights Closed access
Type Article
Web of Science ID WOS:000257069300006

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