Epidemiological study on visual acuity in four regions of Ethiopia.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D005002:Ethiopia; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014786:Vision Disorders / Q000453:epidemiology*; D014792:Visual Acuity