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A form of anomalous trichromatism due to a defect of the green-sensitive retinal cones.
[G. deuteros, second, + anōmalia, anomaly]
A type of anomalous trichromatism in which an abnormally high proportion of green is needed when mixing red and green light to match a given yellow. This is the most common type of colour vision deficiency, occurring in about 4.6% of males and 0.35% of the female population. Syn. deuteranomalous trichromatism; deuteranomalous vision; green-weakness. See anomaloscope; defective colour vision.