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October 1958

Color Blindness and Color TheorySome Discriminations of Normal and Dichromatic Subjects Including a Unilaterally Color-Blind Person

Author Affiliations

New York
Columbia University.

AMA Arch Ophthalmol. 1958;60(4):792-799. doi:10.1001/archopht.1958.00940080812021

Dichromatic and Normal Subjects  We have recently presented a report of research on the luminosity functions of normal subjects as contrasted with those of protanopes and deuteranopes (Hsia and Graham8). The data are presented in Figure 1 which gives the average log luminosity (or log sensitivity) curves for three groups of subjects consisting, respectively, of 7 normal subjects, 5 protanopes and 6 deuteranopes.1 The basic data of the curves are relative energies required for the cones to respond to the spectral lights at the absolute threshold; the logarithms of the reciprocals of these values (i. e., log luminosity values) are here plotted.The peak of the average normal curve is arbitrarily set at zero (i. e., maximum sensitivity is set at unity). Absolute energies may be calculated by observing that, at 578 mμ, the average normal (interpolated) threshold is 3.5× 10-8 ergs. This figure amounts to about 10,000

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