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Retina   /rˈɛtənə/   Listen
Retina

noun
(pl. retinas, retinae)
1.
The innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve.



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"Retina" Quotes from Famous Books



... Caldwell could see nothing else but this spot on the carpet; no, not even though she turned her eyes in various directions, the retina keeping that image to the exclusion ...
— After a Shadow, and Other Stories • T. S. Arthur

... thought! and it was true. They were "clean run to seed." He went to get his cart. (He did not speak to Kitty.) His home came before his eyes like a photograph: fences down, gates gone, houses ruinous, fields barren. It came to him as if stamped on the retina by a lightning-flash. He had worked—worked hard. But it was no use. It was true: they were "clean run to seed." He helped his mother and Kitty into the cart silently—doggedly. Kitty smiled at him. It hurt him like a blow. He saw every worn place, every darn in her old dress, and little, ...
— "Run To Seed" - 1891 • Thomas Nelson Page

... the mountains, I mean to say—how are they going to be held fast by the optic apparatus? The lens, you understand. I want to be able to shove them into a sketch-book, like you fellows. Well, how? That's what I want to know. How to turn my retina into ...
— South Wind • Norman Douglas

... in front of the eye in a dark room, it appears not as an illuminated spark, but as a line of fire; a so-called shooting star, or a flash of lightning produces the same effect. This result is purely physiological, and is due to the fact that the retina of the eye may be considered as practically a sensitized plate of relatively slow speed, and an image impressed upon it remains, before being effaced, for a period of from one-tenth to one-seventh of a second, varying according to the idiosyncrasies of the individual ...
— Edison, His Life and Inventions • Frank Lewis Dyer and Thomas Commerford Martin

... has a blind spot in the retina. When things pass over this blind spot, they absolutely vanish; the other eye supplies the missing object. To the French ace it seemed that his eyes were all blind spots, so far as the Master was concerned. ...
— The Flying Legion • George Allan England

... much light from entering. At night, or whenever the light is scarce, the eye often requires to grasp all it can. The pupil then expands; more and more light is admitted according as the pupil grows larger. The illumination of the image on the retina is thus effectively controlled in accordance ...
— The Story of the Heavens • Robert Stawell Ball

... that an object as seen by us and its image on the retina of the eye, are not exactly the same in position, but quite the reverse. How the image of an object on the retina is inverted in sensation, is a mystery which physical science is admittedly incapable of solving. Western metaphysics, too, with regard to this point, hardly ...
— Five Years Of Theosophy • Various

... eyes there; and "light" means the effect of the one on the other;—and perhaps, also—(Plato saw farther into that mystery than any one has since, that I know of),—on something a little way within the eyes; but we may stand quite safe, close behind the retina, ...
— The Ethics of the Dust • John Ruskin

... spectrum, but refusing to pass out of the blue into the other colours. It was plain that the spot belonged both to the eye and to the blue part of the spectrum. The result to which I have come is, that the appearance is due to the yellow spot on the retina, commonly called the Foramen Centrale of Soemmering. The most convenient method of observing the spot is by presenting to the eye in not too rapid succession, blue and yellow glasses, or, still better, allowing blue ...
— Five of Maxwell's Papers • James Clerk Maxwell

... of the conversion of one form of motion into another—a conservation, as it were, of energy. Thus, waves of light coming from a luminous body are arrested by the pigment-cells of the retina in our eyes and are transmuted into another form of motion, which is called nerve energy (in this instance, sight). It would seem that as far as sight (vision is not included) is concerned, eyes of very simple construction ...
— The Dawn of Reason - or, Mental Traits in the Lower Animals • James Weir

... skin in front of the future eye becomes depressed, the depression increases and assumes the form of a sac, which changes into the aqueous humour and lens. An outgrowth of brain substance, on the other hand, forms the retina, while a third process is a lateral ingrowth of connective tissue, which afterwards changes into the ...
— On the Genesis of Species • St. George Mivart

... he said, "just one isolated noise. Now if I strike this tuning fork you have a vibrating note. In other words, a succession of blows or wave vibrations of a certain kind affects the ear and we call it sound, just as a succession of other wave vibrations affects the retina and we have sight. If a moving picture moves slower than a certain number of pictures a minute you see the separate pictures; faster ...
— The Poisoned Pen • Arthur B. Reeve

... in one of two ways—first, as a vivid picture affecting the focus and retina of the eye, perfect in its outline and colouring, and giving the impression of being either distant or near or at moderate range, Secondly, it may be conveyed as a vivid impression accompanied by a hazy and undefined formation in the crystal field. In this form it becomes ...
— How to Read the Crystal - or, Crystal and Seer • Sepharial

... barracks at Fort Bliss; but there wasn't a map or copy of 'rules and regulations' hanging on the yellowish white walls that I can't see now, whenever I shut my eyes. I guess they were all photographed on my 'mental retina,' as the writing folks say. The three officers were in full uniform, to do honour to the case, and of course there wasn't a man present dressed in 'cits.' All were army chaps, even to the headquarters clerk who took notes ...
— Secret History Revealed By Lady Peggy O'Malley • C. N. Williamson and A. M. Williamson

... respecting vision. Regarding the eye as analogous in its structure with the camera obscura of Baptista Porta, he discovered that the images of external objects were painted in an inverted position on the retina, by the union of the pencils of rays which issued from every point of the object. He ascribed an erect vision to an operation of the mind, by which it traces the rays back to the pupil, where they cross one another, and thus refers the lower parts of the image ...
— The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler • David Brewster

... stronger light of the day; like owls, and bats, and many quadrupeds, and flying insects. When the eye is inflamed, great light becomes eminently painful, owing to the increased irritative motions of the retina, and the consequent increased sensation. Thus when the eye is dazzled with sudden light, the pain is not owing to the motion of the iris; for it is the contraction of the iris, which relieves the pain from sudden light; but to the too violent contractions of the moving ...
— Zoonomia, Vol. II - Or, the Laws of Organic Life • Erasmus Darwin



Words linked to "Retina" :   cone, detached retina, rod cell, macula lutea, cone cell, membrane, central vein of retina, retinal rod, blind spot, optic, fovea centralis, optic disc, tissue layer, eye, fovea, rod, yellow spot, oculus, macula, neuroepithelium, visual cell, macular area, parafovea, optic disk



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