Eye conditions and related need for medical care.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004522:Educational Status; D005128:Eye Diseases / Q000453:epidemiology* / Q000628:therapy; D005260:Female; D006301:Health Services Needs and Demand; D006302:Health Services Research; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D009885:Ophthalmology; D044469:Racial Groups; D014481:United States; D014786:Vision Disorders / Q000453:epidemiology