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retina

retina The light-sensitive membrane that lines the interior of the eye. The retina consists of two layers. The outer layer (pigment epithelium) is pigmented, which prevents the back reflection of light and consequent decrease in visual acuity. The inner layer contains nerve cells, blood vessels, and two types of light-sensitive cells (rods and cones). Light passing through the lens stimulates individual rods and cones, which generates nerve impulses that are transmitted through bipolar and ganglion cells to the optic nerve, and hence to the brain, where the visual image is formed. Information can also be transferred horizontally within the retina via a network of horizontal and amacrine cells (see illustration).

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"retina." A Dictionary of Biology. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

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retina

ret·i·na / ˈretn-ə/ • n. (pl. ret·i·nas or ret·i·nae / ˈretnˌē; ˈretnˌī/ ) a layer at the back of the eyeball containing cells that are sensitive to light and that trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed. DERIVATIVES: ret·i·nal / ˈretn-əl/ adj.

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"retina." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

"retina." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (October 17, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/retina-0

"retina." The Oxford Pocket Dictionary of Current English. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/retina-0

retina

retina Inner layer of the eye, composed mainly of different kinds of neurons, some of which are the visual receptors of the eye. Receptor cells (cones and rods) are sensitive to light. Cones respond to the spectrum of visible colours; rods respond to shades of grey and to movement. The rods and cones connect with sensory neurons, which in turn connect with the optic nerve, which carries the visual stimuli to the brain.

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"retina." World Encyclopedia. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

"retina." World Encyclopedia. . Encyclopedia.com. (October 17, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/retina

"retina." World Encyclopedia. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/retina

retina

retina (ret-in-ă) n. the light-sensitive layer that lines the interior of the eye. The inner part of the retina, next to the cavity of the eyeball, contains rods and cones (light-sensitive cells) and their associated nerve fibres. The outer part (retinal pigment epithelium, RPE) is pigmented to prevent the passage of light.
retinal (ret-in-ăl) adj.

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"retina." A Dictionary of Nursing. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

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retina

retina The light-sensitive membrane in the eye on to which incoming light is focused. The retina has two layers; the outer layer is pigmented and so prevents the back-reflection of light; the inner layer contains blood vessels, nerve endings, and light-sensitive cells (rods and cones). See also TAPETUM.

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"retina." A Dictionary of Zoology. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

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"retina." A Dictionary of Zoology. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/retina

retina

retina XIV. — medL., perh. f. L. rēte net.

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"retina." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

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"retina." The Concise Oxford Dictionary of English Etymology. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/retina-1

retina

retina: see vision; eye.

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"retina." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

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"retina." The Columbia Encyclopedia, 6th ed.. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/retina

retina

retinabeginner, Berliner, Corinna, dinner, grinner, inner, Jinnah, sinner, skinner, spinner, thinner, winner •echidna •Krishna, Mishnah, Ramakrishna •vintner • prisoner • Pilsner •Kitchener • Modena • bargainer •imaginer •Elinor, Helena •milliner •examiner, stamina •epiphenomena, phenomena, prolegomena •alumina, noumena, numina •determiner •mariner, submariner •foreigner • larcener • Porsena •patina • retina • Pristina •Herzegovina • breadwinner •prizewinner •angina, assigner, china, consignor, decliner, definer, Dinah, diner, diviner, forty-niner, hardliner, incliner, Indo-China, liner, maligner, Medina, miner, minor, mynah, recliner, refiner, Regina, Salina, Shekinah, shiner, signer, South Carolina, Steiner, twiner, vagina, whiner •headliner • jetliner • airliner •mainliner • eyeliner • moonshiner •Landsteiner • Niersteiner •Liechtensteiner

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"retina." Oxford Dictionary of Rhymes. . Encyclopedia.com. 17 Oct. 2017 <http://www.encyclopedia.com>.

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"retina." Oxford Dictionary of Rhymes. . Retrieved October 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/retina