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retina
(redirected from retinas)

    Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.04 sec.
retina: see vision vision, physiological sense of sight by which the form, color, size, movements, and distance of objects are perceived.

Vision in Humans



The human eye functions somewhat like a camera; that is, it receives and focuses light upon a photosensitive
..... Click the link for more information. ; eye eye, organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation. Other types of eye are the simple eye, found in many invertebrates, and the compound eye, found in insects and many
..... Click the link for more information. .

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 colour 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 centres of the brain. Disorders affecting the retina or the macula in its centre decrease vision and can cause blindness. See also detached retina; macular degeneration.
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You can't stare at an acetylene torch without burning your retinas and going blind," says Biller, who spent nearly three decades working some of the city's bloodiest homicides and toughest crimes.
COPING WITH COP STRESS SUICIDE, BREAKDOWN TOO OFTEN GO WITH JOB by Daily News (Los Angeles, CA)
Then they transplanted these cells into the retinas of the blind mice.
See, blind mice by Crane, Cody / Science World
However, experts believe your retinas might be even better off if you ate not only carrots but a wide variety of fruits and vegetables as well.
Eating a variety of colorful fruits and vegetables may protect ... by Shaberman, Ben A. / Vegetarian Journal
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