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Protanopia is distinguished from deuteranopia principally by

  • A.complete absence of colour vision in protanopia
  • B.the absence of any practical difference between them
  • C.reduced sensitivity to long wavelength light in protanopia
  • D.reduced sensitivity to short wavelength light in protanopia

Answer: C

A protanope finds reds notably darker as well as confusing them with greens. A deuteranope confuses the same colours but without the loss of luminance. Protanopes find reds unusually dark. The missing cone carries much of the luminance.

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