December 1971
Volume 10, Issue 12
Articles  |   December 1971
Phenotypic Diagnosis of Protan and Deutan Heterozygosity
Author Affiliations
    University of Texas Graduate School of Biomedical Sciences, Houston, Texas, 77025
Investigative Ophthalmology & Visual Science December 1971, Vol.10, 979-984. doi:
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      THOMAS P. PIANTANIDA; Phenotypic Diagnosis of Protan and Deutan Heterozygosity. Invest. Ophthalmol. Vis. Sci. 1971;10(12):979-984.

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      © ARVO (1962-2015); The Authors (2016-present)

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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.


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