Discussion
Assertion (A): Colour discrimination is poorest in the peripheral visual field.
Reason (R): Cone density falls away sharply with distance from the fovea.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Cone density is at its maximum in the fovea and falls steeply within a few degrees, so the periphery is served largely by rods. Peripheral vision is accordingly good at detecting movement and poor at judging colour, which is why colour assessment is done with the sample looked at directly.
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