Blindness.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001766:Blindness / Q000191:economics / Q000523:psychology* / Q000628:therapy; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D009723:Nurse-Patient Relations; D012682:Sensory Aids / Q000191:economics