20/20 vision screening.
D002648:Child; D002675:Child, Preschool; D005128:Eye Diseases / Q000175:diagnosis; D005260:Female; D006801:Humans; D008297:Male; D014786:Vision Disorders / Q000175:diagnosis*; D014787:Vision Tests / Q000295:instrumentation / Q000379:methods*; D014792:Visual Acuity