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  • Title: Confusion points and constant-luminance planes for trichromats, protanopes and deuteranopes.
    Author: Oleari C, Baratta G, Lamedica A, Macaluso C.
    Journal: Vision Res; 1996 Nov; 36(21):3501-5. PubMed ID: 8977016.
    Abstract:
    The confusion points of dichromats are derived from the constant-luminance planes of trichromats, protanopes and deuteranopes experimentally defined by heterochromatic-flicker photometry: (1) the zero-luminance planes of the observers considered in this experiment intersect almost exactly in a line that crosses the plane of the chromaticity diagram in the tritanopic-confusion point and confirm that the short-wavelength sensitive cones can be considered to have no contribution to luminance; (2) protanopic- and deuteranopic-confusion points are taken as being defined by the intersection of the tangent line to the long-wavelength region of the spectrum locus and the zero-luminance plane for protanopes and deuteranopes, respectively.
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