An ophthalmic survey at the Worcester School for the blind.
D000293:Adolescent; D000328:Adult; D001766:Blindness / Q000209:etiology* / Q000235:genetics; D002648:Child; D002675:Child, Preschool; D000013:Congenital Abnormalities / Q000150:complications; D003376:Counseling; D004519:Education, Special; D005053:Eugenics; D005260:Female; D006306:Health Surveys; D006801:Humans; D007223:Infant; D008297:Male; D012572:School Health Services; D013019:South Africa