noun Ophthalmology.
a defect of vision in which the retina fails to respond to blue and yellow.

< Neo-Latin, equivalent to trit- (< Greek trítos third) + an- an-1 + -opia -opia

tritanopic [trahyt-n-op-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tritanopia (ˌtraɪtəˈnəʊpɪə, ˌtrɪt-)
a form of colour blindness in which there is a tendency to confuse blues and greens and in which sensitivity to blue is reduced
[C19/20: from New Latin, from Greek tritos third + New Latin anopia blindness; signifying that only two thirds of the spectrum can be distinguished]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

tritanopia tri·tan·o·pi·a (trī'tə-nō'pē-ə)
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.

The American Heritage® Stedman's Medical Dictionary
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