Voluntary action in the rehabilitation of blind persons.
D000367:Age Factors; D001766:Blindness / Q000534:rehabilitation*; D002675:Child, Preschool; D004519:Education, Special; D006699:Home Care Services; D006801:Humans; D008403:Mass Screening; D012050:Rehabilitation, Vocational; D013663:Teaching; D014787:Vision Tests; D014838:Volunteers