| protanopia | A form of dichromatism characterised by absence of the red-sensitive pigment in cones, decreased luminosity for long wavelengths of light, and confusion in recognition of red and green. Origin: G. Protos, first, + a-priv. + ops (op-) eye (05 Mar 2000) |
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| protanopia |
a dichromasy characterized by retention of the sensory mechanism for two hues only (blue and yellow) of the normal 4-primary quota, and lacking that for red and green and their derivatives, with loss of luminance and shift of brightness and hue curves toward the short-wave end of the spectrum, as in twilight vision.
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| protanopia | dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue |
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