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retina (s), retinae (pl)
1. The innermost coat of the posterior part of the eyeball that receives the image produced by the lens, is continuous with the optic nerve, and consists of several layers, one of which contains the rods and cones that are sensitive to light.
2. The delicate multilayered light-sensitive membrane lining the inner posterior chamber of the eyeball containing the rods and cones and connected by the optic nerve to the brain.
The sensory membrane that lines most of the large posterior chamber of the vertebrate eye, or retina, is composed of several layers including photoreceptor cells, and functions as the immediate instrument of vision by receiving the image formed by the lens and converting it into chemical and nervous signals which reach the brain by way of the optic nerve.
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macula retina (s) (noun)
, macula retinae (pl)
The oval areas of the sensory retina at the back of the eye balls: The center of macula retinae are the central fovea (small cup-shaped depressions or pits), which contain only retinal cones (light-sensitive cell types).