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  • Title: Red-green colour blindness in the Tormes-Alberche Valley (Avila-Central Spain).
    Author: Cabrero FJ, Ortiz MA, Mesa MS, Fuster V, Moral P.
    Journal: Anthropol Anz; 1997 Dec; 55(3-4):295-301. PubMed ID: 9468757.
    Abstract:
    A population from a Central Spanish region (Tormes-Alberche Valley) has been investigated for the presence of red-green colour vision defects. A sample of 998 subjects (469 male and 529 female) was analyzed. To identify colour vision defects, Ishihara test plates were used. The red-green colour blindness percentage obtained was 4.69 +/- 0.976% for males (2.13% protan and 2.56% deutan types) and none of the females tested were found to be colour blind. These results are within the variation range of Mediterranean populations and lower than the usual frequencies among non-Mediterranean European samples.
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