Discussion
Assertion (A): A protanope perceives red objects as unusually dark.
Reason (R): The missing long wavelength cone contributes substantially to the luminance signal.
Answer: D
Both are true and the reason gives the cause, and a deuteranope shows no such darkening. The distinction is used clinically to separate the two conditions. Luminance loss distinguishes the two. Both confuse the same colours otherwise.
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