The incidence of colour-blindness among different dialect groups of Chinese, Malay and Indian schoolboys in Singapore.
D000293:Adolescent; D002648:Child; D002681:China / Q000208:ethnology; D003117:Color Vision Defects / Q000453:epidemiology*; D005006:Ethnicity; D006801:Humans; D007194:India / Q000208:ethnology; D008296:Malaysia / Q000208:ethnology; D008297:Male; D012846:Singapore