Binocular brightness matches in eight spectral regions, ranging from one having a spectral centroid at 452 mμ to one with a spectral centroid at 681 mμ, were determined for a unilaterally dichromatic subject, a young woman with normal color vision in one eye and basically deuteranopic vision in the other. The measurements were made at photopic luminance levels by means of a polarization photometer in which the field of view of each eye subtended 1.8°.
For a report of apparent equality of brightness of the two test fields, the luminance requirements for the field seen by the subject’s color-blind eye exceed those for the field viewed by her normal eye in all but the red spectral regions. The luminance loss varies with wavelength; it is greatest in the green, less in the blue, and even less in the yellow. These selective spectral luminosity losses are maintained over a luminance range of approximately 2.5 log millilamberts. These data confirm earlier findings on selective luminosity losses at threshold for this subject’s deuteranopic eye.
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