noun, Ophthalmology.
a defect of vision in which the retina fails to respond to red or green.
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)
A form of colorblindness characterized by defective perception of red and confusion of red with green or bluish green.

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