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Frequency of Colour Vision Defects Among Zulus in Natal

Published online by Cambridge University Press:  31 July 2008

R. W. Pickford  and
Ruth Pickford
R. W. Pickford
Affiliation:
University of Glasgow, Scotland
Ruth Pickford
Affiliation:
University of Glasgow, Scotland
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Summary

The HRR test was used to study the frequency of colour vision defects in 297 Zulu men and 43 Zulu women of Natal, two Basuto men in Natal, and two Swazi men and 21 Swazi women in the Transvaal.

The frequencies agree with the work of other authors, that the numbers of red–green defectives in the black populations of Africa are less than half those among European whites. The observed frequency of women defectives is greater than that expected from the number of males, and the difference is probably due largely to the inclusion of a small number of women with considerable heterozygous manifestation.

No yellow–blue deficient subjects were found.

Information

Type
Research Article
Information
Journal of Biosocial Science , Volume 13 , Issue 2 , April 1981 , pp. 241 - 248
Copyright
Copyright © 1981, Cambridge University Press

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