Incidence of known and unknown colour vision defects. A study of 6526 secondary school pupils in Amsterdam.
D000293:Adolescent; D002648:Child; D003119:Color Perception Tests; D003117:Color Vision Defects / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D009426:Netherlands; D012572:School Health Services