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Give a brief account of: (b) Mechanism of vision

Q6.    Give a brief account of:

         (b) Mechanism of vision

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  • The light rays pass through the pupil, lens, aqueous humour, vitreous humour and falls on the retina.
  • The light induces the dissociation of the photo-pigment rhodopsin into opsin and retinal.
  • The dissociation of opsin from the retinal brings changes in the structure of opsin.
  • This generates an action potential in the rods and cones of the retina.
  • The action potential is further transmitted to the ganglion cells through bipolar neurons.
  • It is finally transmitted to the visual cortex of the brain via the optic nerve.
  • The impulses are analysed at the visual cortex and the responses are sent back to form the image on the retina.
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