Characteristics of visually impaired persons. United States-July 1963-June 1964.
D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D004522:Educational Status; D005260:Female; D006306:Health Surveys; D006801:Humans; D007182:Income; D008297:Male; D008875:Middle Aged; D012111:Residence Characteristics; D012656:Self-Help Devices / Q000706:statistics & numerical data; D014481:United States; D014786:Vision Disorders / Q000145:classification / Q000453:epidemiology*