Discussion
Assertion (A): Older observers are less reliable at discriminating blues.
Reason (R): Progressive yellowing of the lens absorbs short wavelength light before it arrives.
Answer: A
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. Yellowing of the lens removes short wavelength light before it reaches the receptors, so the S cone signal is weakened and blue discrimination declines. This is a normal consequence of ageing rather than a deficiency, but it is a real source of disagreement between observers of different ages.
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