[ noun ] the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve <noun.body>
Retina \Ret"i*na\, n. [NL., from L. rete a net. Cf. {Reticule}.] (Anat.) The delicate membrane by which the back part of the globe of the eye is lined, and in which the fibers of the optic nerve terminate. See {Eye}.
Note: The fibers of the optic nerve and the retinal blood vessels spread out upon the front surface of the retina, while the sensory layer (called Jacob's membrane), containing the rods and cones, is on the back side, next the choroid coat.
In the early stages of the eye disease, weakened blood vessels may leak, causing the retina to swell and resulting in blurred vision.
Removal of the skin that had covered the girl's eyes revealed that the retina of her right eye could detect light, he said.
Staring at the sun for more than a couple of seconds can burn and scar the retina, potentially leading to distorted vision or blindness.
Lots of computing power will be devoted to keeping records safe from tampering: Before it allows anyone to open a file or change a document, a computer may ask for voice identification, a thumbprint or a retina scan.
The retina is gone." Ketring wouldn't speculate what caused the condition.