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S cones are comparatively scarce in the retina, which means that

  • A.blue objects cannot be seen at all in the periphery
  • B.blue light is not detected by the visual system
  • C.the S cones dominate the perception of brightness
  • D.spatial resolution for blue detail is notably poorer

Answer: D

They make up only a few per cent of the cone population and are absent from the very centre of the fovea. Fine blue detail is consequently resolved far less well than fine red or green detail. S cones are absent from the very centre of the fovea.

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