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Poorer color discrimination by females when tested with pseudoisochromatic plates containing vanishing designs on neutral backgrounds

Published online by Cambridge University Press:  03 July 2008

RIGMOR C. BARAAS
RIGMOR C. BARAAS*
Affiliation:
Department of Optometry & Visual Science, Buskerud University College, Kongsberg, Norway
*
Address correspondence and reprint requests to: R.C. Baraas, Department of Optometry & Visual Science, Buskerud University College, P.O. Box 251, 3603 Kongsberg, Norway. E-mail: rigmor.baraas@hibu.no
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Abstract

It might be expected that normal trichromatic females would perform as well as normal trichromatic males of the same age when tested with standard clinical color-vision tests that use pseudoisochromatic vanishing designs on neutral gray backgrounds such as the Hardy-Rand-Rittler (HRR) pseudoisochromatic plates and the Neitz Test of Color Vision (NTCV). Here 2966 children aged 6–13 years from four municipalities in Norway were tested in their school classrooms with the NTCV. Children who made errors on the test were retested. 187 males and 152 females made one or more errors on retest, and each was tested individually on the Richmond HRR Fourth Edition. 8% of the males were defined as color deficient when a double criterion for failing was applied, that is, one or more errors on the NTCV and two or more errors on the HRR. The calculated frequency of color-deficient females (homozygotes) for the same criterion is 0.42%. By contrast, 3% of females failed the criterion that gave a stable population of color-deficient males. This result is considered in relation to reports of female carriers of color-vision deficiency having problems with the Ishihara test and of females having poorer color discrimination than males.

Keywords

Color visionPseudoisochromatic testsColor-vision testingHeterozygoteChildren
Type
Research Article
Information
Visual Neuroscience , Volume 25 , Issue 3 , May 2008 , pp. 501 - 505
Copyright
Copyright © Cambridge University Press 2008

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