noun Ophthalmology.
a defect of vision in which the retina fails to respond to red or green.

1900–05; < Neo-Latin; see prot-, an-1, -opia

protanopic [proht-n-op-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
protanopia (ˌprəʊtəˈnəʊpɪə)
a form of colour blindness characterized by a tendency to confuse reds and greens and by a loss of sensitivity to red light
[C20: New Latin, from proto- + an- + -opia]

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

protanopia pro·ta·no·pi·a (prō'tə-nō'pē-ə)
A form of colorblindness characterized by defective perception of red and confusion of red with green or bluish green.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
People with a form of color vision call protanopia have a markedly reduced sensitivity to long wavelength light.
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