a defect of vision in which the retina fails to respond to red or green.
- pro·ta·nop·ic [proht-n-op-ik], /ˌproʊt nˈɒp ɪk/, adjective
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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
- protanopic (ˌprəʊtəˈnɒpɪk), adjective
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