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(Investigative Ophthalmology and Visual Science. 1971;10:979-984.)
© 1971 by The Association for Research in Vision and Ophthalmology, Inc.

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Phenotypic Diagnosis of Protan and Deutan Heterozygosity

THOMAS P. PIANTANIDA 1

1 University of Texas Graduate School of Biomedical Sciences, Houston, Texas, 77025

The color vision of 18 women whose color vision genotype was known were tested on the Nagel anomaloscope. An amended examination procedure was used which allowed repeated brightness matches to be made. This procedure revealed that the spectral region of minimum average brightness settings was useful in determining heterozygosity for protan defects and that deutan heterozygous persons have a unique spectral region of minimum average variance of brightness settings.

Key Words: Heterozygote • phenotypic diagnosis • protan • deutan • minimum average variance

Submitted on August 30, 1971
Accepted on September 27, 1971






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