Abstract
THE following pedigree is of interest because it shows three types of red-green colour vision defect together, namely, protanopia (P), extreme protanomaly (EPA) and protanomaly (PA) with darkened red, and because it supports the theory that PA is dominant to EPA1,2. 
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References
Franceschetti, A., Schweiz. Med. Wchsch., 58, 52, 1273 (1928).
Pickford, R. W., “Individual Differences in Colour Vision”, 361 (London, 1951).
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PICKFORD, R. A Pedigree for Three Types of Colour-Vision Defect. Nature 172, 1010 (1953). https://doi.org/10.1038/1721010a0
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DOI: https://doi.org/10.1038/1721010a0
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