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The crystalline lens yellows with age, which means that older observers

  • A.receive less long wavelength light at the retina
  • B.become entirely unable to distinguish any colours
  • C.see colours identically to younger observers
  • D.receive less short wavelength light at the retina

Answer: D

Correct answer: receive less short wavelength light at the retina

The lens yellows progressively through life, and a yellow filter is one that absorbs blue. The retina of an older observer therefore receives less short wavelength light, which changes colour matches slightly and degrades blue discrimination. Long wavelength transmission is barely affected.

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