Vision screening of four-year-old children.
D000550:Amblyopia / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006306:Health Surveys; D006801:Humans; D008297:Male; D008403:Mass Screening; D008722:Methods; D013285:Strabismus / Q000453:epidemiology; D013997:Time Factors; D014786:Vision Disorders / Q000175:diagnosis / Q000453:epidemiology* / Q000235:genetics; D014787:Vision Tests; D014792:Visual Acuity