noun, Ophthalmology.
a defect of vision characterized by a diminished response of the retina to red.

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    noun, Ophthalmology. 1. a defect of vision in which the retina fails to respond to red or green. noun 1. a form of colour blindness characterized by a tendency to confuse reds and greens and by a loss of sensitivity to red light protanopia pro·ta·no·pi·a (prō’tə-nō’pē-ə) n. A form of colorblindness characterized by defective perception […]

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