Blindness in a Zairian city.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001766:Blindness / Q000453:epidemiology* / Q000209:etiology; D002648:Child; D002675:Child, Preschool; D015023:Democratic Republic of the Congo; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D014505:Urban Population; D014787:Vision Tests