The Incidence of Color Blindness Among Races

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Abstract
Percentage of color blindness in different groups, detd. by the Ishihara test, was as follows (The figures given are, % in [male], % in [female]): Whites (unselected), 8.4, 1.3; Jews, 4, 0; Indians, full-blood, various tribes, 2.5, 0; full blood, Navajo, 1.1, 0.7; mixed bloods, 5.2, 0.8; Mexicans, in Old Mexico, 2.3, 0.6; Mexican immigrants, 2.5, 0.9; Spanish-Americans, 3.8, 0.8; Negroes, Southern, 3.9, 0.8; Negroes, Northern, 2.8, 0. The differences are probably due to selection and not to race.

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