Diagnosis and genetics of defective colour vision / by H. Kalmus.

  • Kalmus, H. (Hans), 1906-1988.
Date:
[1965]
Catalogue details

Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: Diagnosis and genetics of defective colour vision / by H. Kalmus. Source: Wellcome Collection.

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    types of defective colour vision 15 An association between normal eye (iris) colour and hair colour on the one hand and defective colour vision on the other has in. the past been suspected, and Burt (1945) as well as Vernon and Straker (1943, see p. 95) have indeed shown that in a large British sample population the frequency of colour defectives is positively correlated with the darkness of the iris and perhaps also with the pigmentation of the hair. This correlation—or rather the association between defective colour vision and pigmentation—is unlikely to be of a pleiotropic nature, but is probably a consequence of the heterogeneity of local Table i. Eye diseases in wincH disturbances of colour vision occur British populations in respect of both the pigmentation genes and the genes responsible for defective colour vision (see also p. 95). Pickford (1951) who searched for a correlation of defective colour vision with skin colour—but not eye colour—did not find it. Finally there are the conditions which are remarkably stable throughout hfe* and as far as we know all not associated with any other symptoms and which are traditionally called hereditary colour blindness. Most of these are sex linked, but a few are not. These stable conditions form the main subject of this monograph. In addition to the genetically pure forms, composite forms exist, which complicate the picture and at the same time make it more interesting. The classifications of hereditary defective colour vision have gradu¬ ally emerged from the work of physicists, physiologists and psycho¬ logists and are largely, but not entirely, based on trichromatic theory * Age has only a slight effect on the most frequently used colour vision tests (Lakowski, 1961). See also p. 53.