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Possible definitions for rhytina
retina
Layer of nerve tissue covering the back two-thirds of the eyeball. Light focused onto the retina by the lens of the eye stimulates two types of light-sensitive cells: rods, which are sensitive to low light levels, and cones, which provide detailed vision and color perception. Chemical changes in these cells trigger nerve impulses, which are assembled by complex connections among retinal nerves into a pattern to be carried through the optic nerve to the visual centers of the brain. Disorders affecting the retina or the macula in its center decrease vision and can cause blindness. See also detached retina, macular degeneration.
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