tritanopia /tri·ta·no·pia/ (tri″tah-no´pe-ah) a rare type of dichromatic vision marked by retention of the sensory mechanism for two hues only (red and green), with blue and yellow being absent.tritanop´ic
tri·tan·o·pi·a (tr  t -n  p -)n. A deficiency in color preception characterized by an inability to discern blue and yellow due to an absence of blue-sensitive pigment in the retina. |
tritanopia
A rare type of dichromatism in which blue and yellow are confused. The tritanope only sees two colours: reds on the long-wave side, and greens or bluish greens on the other side of his neutral point, which is situated around 570 nm. Tritanopia occurs more often as an acquired type as a result of retinal disease or detachment, glaucoma, diabetes, retinitis pigmentosa, etc. Congenital tritanopia is very rare: it is estimated at about five males and three females in 100 000. Syn. blue blindness; blue-yellow blindness. See defective colour vision; dichromatism; pseudoisochromatic plates; Farnsworth test.
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