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[proht-n-oh-pee-uh] /ˌproʊt nˈoʊ pi ə/
noun, Ophthalmology
a defect of vision in which the retina fails to respond to red or green.
Origin of protanopia
1900-05; < New Latin; see prot-, an-1, -opia
Related forms
[proht-n-op-ik] /ˌproʊt nˈɒp ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for protanopia
  • People with a form of color vision call protanopia have a markedly reduced sensitivity to long wavelength light.
British Dictionary definitions for protanopia


a form of colour blindness characterized by a tendency to confuse reds and greens and by a loss of sensitivity to red light
Derived Forms
protanopic (ˌprəʊtəˈnɒpɪk) adjective
Word Origin
C20: New Latin, from proto- + an- + -opia
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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protanopia in Medicine

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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