Citation :
Crawford and Hammar, who examined over 100,000 school children in Hawaii in 1949, found clues to racial and ethnic differences affecting the prevalence and incidence of refractive disorders. Ten ethnic groups were represented: Japanese (41,684), partial Hawaiian (20,375), Filipino (9,732), Portuguese (6,562), Chinese (5,621), Caucasian (5,353), Hawaiian (2,758), Puerto Rican (1,764), Korean (1,036) and Spanish (193). Chinese school children exhibited the greatest amount of myopia (17 per cent), followed by Koreans (13 per cent), and Japanese (12 per cent).
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