| 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.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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