Optometrists employed in health services: United States-1968.
D000328:Adult; D000368:Aged; D003710:Demography; D005260:Female; D005843:Geography; D006801:Humans; D008297:Male; D008875:Middle Aged; D009907:Optometry; D011364:Professional Practice; D014481:United States; D000078329:Workforce