title: [Prevalence of blindness and eye diseases in an outer suburban district of Beijing].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001766:Blindness / Q000453:epidemiology*; D002648:Child; D002681:China; D005128:Eye Diseases / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014141:Trachoma / Q000453:epidemiology