Abstract
TWO achromats, a woman student and a man student, were recently tested for colour vision. Both proved to be of the so-called pure rod-vision type1, completely lacking in hue discrimination, with marked photophobia, nystagmus and central scotoma in photopic vision, and both had been totally colour blind since infancy.
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References
Sloan, Louise L., J. Opt. Soc. Amer., 44, 117 (1954); Geldard, F. A., J. Opt. Soc. Amer., 23, 256 (1933).
Schmidt, I., Amer. J. Optometry, 32, 404 (1955); Pickford, R. W., “Individual Differences in Colour Vision”, 335 (London, 1951).
Pickford, R. W., Brit. J. Physiol. Optics, 14, 2 (1957).
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PICKFORD, R. Colour Vision of Achromats' Parents. Nature 180, 926–927 (1957). https://doi.org/10.1038/180926b0
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DOI: https://doi.org/10.1038/180926b0
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