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A form of partial colour-blindness resulting from an abnormality in the visual pigment that absorbs long-wave light, resulting in a partial loss of sensitivity to light in the red part of the visible spectrum, a tendency to confuse reds and greens, and matches that deviate from the normal Rayleigh equation. See also daltonism. Compare deuteranomaly, protanopia, tritanomaly. [From Greek protos first, from pro before, alluding to the first of the three primary colours (1) red, green, and blue + anomalos uneven or inconsistent, from an- without + homalos even, from homos the same]

Subjects: Psychology.

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