Question

How do rods and cones differ functionally?

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Rods

  • number : 120 million / retina.
  • distribution : mostly peripheral.
  • photosensitive pigment: Rhodopsin.
  • light sensitivity : high ( 300 times as comes ).
  • threshold for stimulation : low.
  • convergence : well marked.
  • function : scotopic ( night ) vision.
  • acuity of vision : low.
  • shape : uniform all over.

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