- a defect of vision in which the retina fails to respond to red or green.
Origin of protanopia
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- 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
- A form of colorblindness characterized by defective perception of red and confusion of red with green or bluish green.