anomaly of vision in which there is a reduced ability to discriminate between some or all colours Note 1 to entry: Types of defective colour vision include – anomalous trichromatism: deuteranomaly, protanomaly and tritanomaly; – dichromatism: deuteranopia, protanopia and tritanopia; – monochromatism. Note 2 to entry: This entry was numbered 845-02-13 in IEC 60050-845:1987.
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