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Three of the following contribute to differences between individual observers. Which is the odd one out?

  • A.variation in lens yellowing with age
  • B.variation in the relative numbers of cone types
  • C.variation in the spectral power of the illuminant
  • D.variation in macular pigment density

Answer: C

The illuminant is a property of the lighting rather than of the observer. The other three are genuine sources of observer to observer variation. The illuminant belongs to the lighting instead. Only the first three are properties of the eye.

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