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Field size metamerism arises because

  • A.a larger sample sends back more light altogether
  • B.the light source alters as the sample grows larger
  • C.no reliable reading can be taken from a tiny sample
  • D.the retina has a different receptor mix at different eccentricities

Answer: D

The two degree and ten degree observers exist for exactly this reason. A pair matching at one field size may separate at the other. Receptor mix varies with retinal eccentricity. Two standard observers exist for this reason.

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