SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Human retina. The retina lines the back wall of the eyeball, and is made up of light sensitive cells. As light travels from the eye's lens to the retina, impulses from the retina's cells travel along the optic nerve to the brain for processing. The brain will then build a picture of what is being viewed.
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