title: Letter: Color vision deficiencies in American youths.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D003119:Color Perception Tests; D003117:Color Vision Defects / Q000145:classification / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D014481:United States