BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Eye. Cross-sectional view of the human eyeball. The eye is the organ of sight. Light passes through the cornea (grey, centre left) which helps in focusing the light. The iris (brown, centre left) contracts or relaxes to allow the optimum amount of light through the pupil (black, centre left). The light then is finely focused by the lens (blue, centre left) and falls on the retina at the back of the eyeball (centre right). The retina is made up of many light sensitive nerve cells, and has a fine network of blood vessels (orange, blue) running through it. Information from the retinal nerve cells is relayed to the brain via the optic nerve (lower right).
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