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retina (retīĭ-nә) the innermost of the three tunics of the eye, surrounding the vitreous body and continuous at the back with the optic nerve. The retina is composed of light-sensitive neurons arranged in three layers; the first layer is made up of visual cells called rods and cones, and the other two layers transmit impulses from the rods and cones to the optic nerve. The rods are sensitive in dim light, and the cones are sensitive in bright light and are responsible for color vision.
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