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Retina   Listen
noun
Retina  n.  (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.






Collaborative International Dictionary of English 0.48








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"Retina" Quotes from Famous Books



... T. Troland of Harvard tells us, "are built up on the same principle as the ordinary 'half-tone' engravings; that is, they are made up of minute dottings or stripplings far too small to be detected by the eye. . . . The sensitiveness of the retina is so great that a visual sensation can be produced by relatively few Quanta of the right kind of light." Through a master's divine knowledge of light phenomena, he can instantly project into perceptible manifestation the ubiquitous light atoms. The actual form of the projection-whether ...
— Autobiography of a YOGI • Paramhansa Yogananda

... he answered, as he puttered with his wires. 'Cats and owls can see in the dark, und the accepted explanation is that by their power of enlarging der pupils they admit more light to the retina. But that explanation never satisfied me. You haf noticed, haf you not, that a cat's eyes shine in der dark, but only when der cat is looking at you?—that is, when it looks elsewhere you do not see ...
— The Grain Ship • Morgan Robertson

... living and dead is put together from them. It is accomplishing wonders before us every day, such as Arabian story-tellers used to string together in their fables. It spreads the sensitive film on the artificial retina which looks upon us through the optician's lens for a few seconds, and fixes an image that will outlive its original. It questions the light of the sun, and detects the vaporized metals floating around the great ...
— Medical Essays • Oliver Wendell Holmes, Sr.

... demands must be met by modifying the artificial illuminants which are available. Vision is accomplished entirely by the distinction of brightness and color. An image of any scene or any object is focused upon the retina as a miniature map in light, shade, and color. Although the distinction of brightness is a more important function in vision than the ability to distinguish colors, color-vision is far more important in daily life than is ordinarily appreciated. ...
— Artificial Light - Its Influence upon Civilization • M. Luckiesh

... not only to be a lord, it was more than that. It was to be famous, a national character, whose picture was printed on the retina of the million. Never had Jones felt more inclined to stick to his position than now, with the hounds on his traces, a tramp for his companion, and darkness ahead. He felt that if he could once get to London, once lay his hands ...
— The Man Who Lost Himself • H. De Vere Stacpoole

... choking them. These symptoms were accompanied by nausea and qualms at the pit of the stomach, while maleficent goblins kept puncturing their aguish, trembling legs with needles. Another of the physical effects of their fear was that in the congested condition of the blood vessels of the retina they beheld thousands upon thousands of small black specks flitting past them, as if it had been possible to ...
— The Downfall • Emile Zola

... save as first step to a spiritual existence within our soul. This is particularly the case with music. There is nothing in the realm of sound at all corresponding to the actual photographing of a visible object on the retina; our auditive apparatus, whatever its mysteries, gives no sign of being in any way of the nature of a phonograph. Moreover, one element of music is certainly due to the sense of locomotion, the rhythm; so that ...
— Hortus Vitae - Essays on the Gardening of Life • Violet Paget, AKA Vernon Lee

... 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 effect of this vacancy moving about, shifting a chair, stirring a book, ...
— The Flying Legion • George Allan England

... us as anything but the barbarians they call us. Red hair and blue eyes may make up what Baron Hubner would euphemistically describe as the "beau type d'un gentleman anglais," but when worn with a funny-shaped hat, a short coat, tight trousers, and a Penang lawyer, the picture produced on the retina of a Chinese mind is unmistakably that ...
— Chinese Sketches • Herbert A. Giles

... thus prevents too 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 with the requirements ...
— The Story of the Heavens • Robert Stawell Ball

... and the old royal demesne has been turned into an agricultural college. Adjoining and practically forming part of Portici is the town of Resina, which preserves almost intact the old classical name of Retina that it bore in the distant days when it served as the port of Herculaneum. Here then in the mean streets of Resina we find ourselves standing above, though certainly not upon, historic ground, for the temples and villas, the theatres and ...
— The Naples Riviera • Herbert M. Vaughan

... and a blue-velvet coat, for Church and Sunday-school as well; and she planned a hundred vengeances. That is to say, her mind did not occupy itself with plots possible to make real; but rather it dabbled among those fragmentary visions that love to overlap and displace one another upon the changeful retina of ...
— Gentle Julia • Booth Tarkington

... sense are really the result of complicated reasonings. The most cursory glance at objects enables the experienced eye to judge approximately of their relations and distance, although nothing is impressed upon the retina except colour, including gradations of light and shade. From these delicate and almost imperceptible differences we seem chiefly to derive our ideas of distance and position. By comparison of what is near with what is distant we learn that the tree, house, river, etc. which are a long ...
— Theaetetus • Plato

... seen that, in focussing, the distance between lens and image depends on the distance between object and lens. Now, the retina cannot be pushed nearer to or pulled further away from its lens, like the focussing screen of a camera. How, then, is the eye able to focus sharply objects at distances varying from ...
— How it Works • Archibald Williams

... ideas become exalted and profitable, it becomes necessary for me, in the outset, to explain their power and define their sphere, and to vindicate, in the system of our nature, their true place for the intellectual lens and moral retina by which and on which our informing thoughts are ...
— Modern Painters Volume II (of V) • John Ruskin

... not done so, and she sat down in a comfortable chair. Her arrival caused a flutter among the other occupants of the terrace, and even the Englishman glanced up. This group had at last made some impression it would seem upon the retina of his eye, for he looked deliberately at them and realized that the two women were quite ...
— The Man and the Moment • Elinor Glyn

... mid-morning throws over imperial Rome. Above, that canopy of translucent blue, iridescent and scintillating with a thousand colours, flicks of emerald and crimson, of rose and of mauve that merge and dance together, divide and reunite before the retina, until the gaze loses consciousness of all colour save one all-pervading sense ...
— "Unto Caesar" • Baroness Emmuska Orczy

... these faulty genes for good. Researchers are already using this new technique to target and destroy cells that cause breast cancer. Soon, we may be able to use it to prevent the onset of Alzheimer's Disease. Scientists are also working on an artificial retina to help many blind people to see and microchips that would directly stimulate damaged spinal cords and allow people who are now paralyzed ...
— Complete State of the Union Addresses from 1790 to the Present • Various

... Kid read his thoughts openly, and wandered back with him through all the weary days of famine and disease; and with him was also the patient Madeline, sharing his pains and perils, never doubting, never complaining. His mind's retina vibrated to a score of pictures, stern, clear-cut, and the hand of the past drew back with heavy fingers on his heart. It was the psychological moment. Malemute Kid was half-tempted to play his reserve card and win the game; but the lesson was too ...
— The Son of the Wolf • Jack London

... prolonged sitting or lying in one position, and as a result pain compels a muscular action that shifts the damaging pressure—this is the pain of anemia; when the rays of the blazing sun shine directly upon the retina, pain immediately causes a protective muscular action—the lid is closed, the head turns away—this is light pain; when standing too close to a blazing fire the excessive heat causes a pain which results in the protective ...
— The Origin and Nature of Emotions • George W. Crile

... towering. They mounted, and wheeled, and circled back or darted away. The sky became fairly obscured with them in the sense that it seemed inconceivable that hither space could contain another bird. Before the retina of the eye they swarmed exactly as a nearer cloud of mosquitoes ...
— The Killer • Stewart Edward White

... assistant, a slender youth, resisted his efforts, forcing Pat's head back by sitting upon it. Pat twisted and writhed to throw him off. But the man stayed with him, and finally had him prone to earth again. Whereupon Pat experienced the chagrin of his first defeat. Yet he could see. Upon the retina of each eye danced a picture. It was that of his mistress, surrounded by open-mouthed spectators, outside the fence, gazing down upon him with seeming approval. This once, but only this once, he ...
— Bred of the Desert - A Horse and a Romance • Marcus Horton

... (section 17), the apparent sizes of things vary as we move, and this means that the quantity of sensation, when I observe the apple from a nearer point, is greater. The man of science tells me that the image which the object looked at projects upon the retina of the eye grows larger as we approach objects. The thing, then, may remain unchanged; our sensations will vary according to the impression which ...
— An Introduction to Philosophy • George Stuart Fullerton

... But the mental retina of the great painter can hold such things as he has seen till he transfers them to the canvas; so can the brain of the great masters who paint for us in words, till they embody them in delicate prose or exquisite poetry. The lack of power to express often ...
— Platform Monologues • T. G. Tucker

... and buttoning up his coat, he whisked himself from the room, and Barclay, looking out of the window, watched the two forms as they disappeared in the dusk. But appearances are so deceptive. The truth is that what he saw was not there at all, but only appeared on his retina; the two forms that he seemed to see were not shivering through the twilight, but were walking among dahlias and coxcombs and four-o'clocks and petunias and poppies and hollyhocks on a wide lawn whereon newly set elm trees were fluttering their faint green foliage in the ...
— A Certain Rich Man • William Allen White

... well thought-out. The conclusion that the public will have an accurate view is not warranted, for the state of its eyes must be examined, to ascertain whether it is near or far-sighted, or if the retina naturally, or through habit, is sensitive to certain colors. In the same way the French of the eighteenth century must be considered, the structure of their inward vision, that is to say, the fixed form of their intelligence which ...
— The Origins of Contemporary France, Volume 1 (of 6) - The Ancient Regime • Hippolyte A. Taine

... down to shut your eyes, and open them very cautiously in a minute or so's time. One still sees. The sense of vision is a question of length of vibration, and not of multitude of impacts; but there's a kind of shock to the retina, a nasty giddy confusion just at the time, if the eyes are open. ...
— Twelve Stories and a Dream • H. G. Wells

... in straight lines and, striking objects before us, is reflected in all directions. Some of these rays passing through a point situated behind the lenses of the eye, strike the retina. The multiplication of these rays on the retina produces a picture of whatever is before the eye, such as can be seen on the ground glass at the back of a photographer's camera, or on the table of a camera obscura, both ...
— The Practice and Science Of Drawing • Harold Speed

... offered no complete impediment to vision. As volition was in abeyance, the balls could not roll in their sockets—but all objects within the range of the visual hemisphere were seen with more or less distinctness; the rays which fell upon the external retina, or into the corner of the eye, producing a more vivid effect than those which struck the front or interior surface. Yet, in the former instance, this effect was so far anomalous that I appreciated it only as sound—sound sweet or discordant as the matters presenting themselves at my side were ...
— Edgar Allan Poe's Complete Poetical Works • Edgar Allan Poe

... specks passing across its surface? At first you imagine they are motes clogging the delicate blood-vessels of the retina; then you wonder if a distant host of falling meteors could have passed. Soon a larger, nearer mote appears; the moon and its craters are forgotten and with a thrill of delight you realise that they are birds—living, flying birds—of all earthly ...
— The Log of the Sun - A Chronicle of Nature's Year • William Beebe

... maintained by high authority, that the natural acuteness of our sensuous faculties cannot be heightened by use, and hence, that the minutest details of the image formed on the retina are as perfect in the most untrained as in the most thoroughly disciplined organ. This may be questioned, and it is agreed on all hands that the power of multifarious perception and rapid discrimination ...
— The Earth as Modified by Human Action • George P. Marsh

... It is no more art[49] to manipulate a camel's hair pencil, than to manipulate a china tray and a glass vial. It is no more art to lay on color delicately, than to lay on acid delicately. It is no more art to use the cornea and retina for the reception of an image, than to use a lens and a piece of silvered paper. But the moment that inner part of the man, or rather that entire and only being of the man, of which cornea and retina, fingers and hands, pencils ...
— The Stones of Venice, Volume III (of 3) • John Ruskin

... off—reflected upon the eye, producing by their combination what we call the color of the object. Thus, a ray thrown upon a pure white object is absorbed not at all, but wholly reflected as it came, and the consequence is the proper combination upon the retina of all the colors, producing—a white object. On the contrary, a ray falling upon what we call a black object, is wholly absorbed, and the consequence is a total absence of light, or blackness. So a red object absorbs ...
— The Continental Monthly, Vol III, Issue VI, June, 1863 - Devoted to Literature and National Policy • Various

... ordinary room in the 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 ...
— Secret History Revealed By Lady Peggy O'Malley • C. N. Williamson and A. M. Williamson

... I opened them she was gone. Shutting them again and opening, there she was, sunning herself, breathing deep and long, watching her own beauties as the light played with them. I tried this many times and it did not fail me. I could, with her assistance, bring her upon my retina or take her off it, as if I had worked a shutter across my eyes. But as I watched her so I got very excited. Her business was so mysterious, her pleasure in it so absorbing; she was visible and yet secret; ...
— Lore of Proserpine • Maurice Hewlett

... the ultimate body by conceiving it to be entire brain. This it is not; but a conception of this nature will bring you near a comprehension of what it is. A luminous body imparts vibration to the luminiferous ether. The vibrations generate similar ones within the retina; these again communicate similar ones to the optic nerve. The nerve conveys similar ones to the brain; the brain, also, similar ones to the unparticled matter which permeates it. The motion of this latter is thought, of which perception is the first undulation. This is the mode by which the ...
— The Works of Edgar Allan Poe - Volume 2 (of 5) of the Raven Edition • Edgar Allan Poe

... have to own that there are very few such. The two pictures which I have already referred to, those of Erasmus and of Dr. Johnson, come up more distinctly before my mind's eye than almost any faces of the living. My mental retina has, I fear, lost much of its sensitiveness. Long and repeated exposure of an object of any kind, in a strong light, is ...
— Our Hundred Days in Europe • Oliver Wendell Holmes

... this quality to difference in the LENGTH of ether waves impinging on the retina, which causes the sensation of color. The wave length M. 5269 gives a sensation of green, while M. 6867 ...
— A Color Notation - A measured color system, based on the three qualities Hue, - Value and Chroma • Albert H. Munsell

... Motunta a splendid meteor was observed to lighten the whole heavens. The observer's back was turned to it, but on looking round the streak of light was seen to remain on its path some seconds. This streak is usually explained to be only the continuance of the impression made by the shining body on the retina. This cannot be, as in this case the meteor was not actually seen and yet the streak was clearly perceived. The rays of planets and stars also require another explanation ...
— A Popular Account of Dr. Livingstone's Expedition to the Zambesi and Its Tributaries • David Livingstone

... of the one had been singularly perfected by practice. The sensibility of its retina must have been as instantaneous as that of those conjurors who recognize a card merely by a rapid movement in cutting the pack or by the arrangement only of marks invisible to others. The Frenchman indeed possessed ...
— Michael Strogoff - or, The Courier of the Czar • Jules Verne

... 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, and defy the philosophers. ...
— The Ethics of the Dust • John Ruskin

... division. This has proved to be altogether a mistake. If matter were infinitely divisible in this sense, its particles must be imponderable, and a million of such molecules could not weigh more than an infinitely small one. But the particles of that imponderable matter, which, striking upon the retina, give us the sensation of light, are not in a mathematical ...
— Familiar Letters of Chemistry • Justus Liebig

... we suppose it to be sensitive to rays unknown to the ordinary retina, this extraordinary sight could not be the sense that warns the butterfly at a distance and brings it hastening to the bride. Distance and the objects interposed ...
— Social Life in the Insect World • J. H. Fabre

... and I have never been in one since, and yet so inexplicable a thing is memory, the picture stands before me now clear as if it were painted and tangible. So many millions of pictures have come and gone upon the retina, and yet I can single out this one in an instant, and take it down as you would a book from a shelf. The millions of coloured etchings that have fixed themselves there in the course of those years are all in due order in the portfolio of the mind, and yet they cannot occupy the space of ...
— Field and Hedgerow • Richard Jefferies

... is that which photographs, as it were, upon the brain the visual impressions that objects have made upon the retina, in such a manner that the thought can reconstruct them ideally. This, in particular, is the form of memory required by designers of all kinds, and, like the other forms of visual memory, is susceptible of education. The child is first taught to copy with his pencil and produce exact imitations ...
— The Physical Life of Woman: - Advice to the Maiden, Wife and Mother • Dr. George H Napheys

... disagreeable sensation in some distant part, and not on the irritation of the muscles themselves. Thus when a particle of dust stimulates the ball of the eye, the eye-lids are instantly closed, and when too much light pains the retina, the muscles of the iris contract its aperture, and this not by any connection or consent of the nerves of those parts, but as an effort to prevent or to remove a disagreeable sensation, which evinces that vegetables are endued with sensation, ...
— The Botanic Garden - A Poem in Two Parts. Part 1: The Economy of Vegetation • Erasmus Darwin

... of an idiot. Fatalities of flesh and blood, unending strife,—I saw all pass before my eyes, until night caused me to lose my taste for day, and now I cannot distinguish flowers from thistles. Everything is confused in my wearied retina. ...
— Brazilian Tales • Joaquim Maria Machado de Assis

... registers a small pale patch been occupying a corner of my retina for the last half hour; it turns out to be ...
— The Lost Kafoozalum • Pauline Ashwell

... The reasons for this are based on natural laws and are explained in a very simple manner in a learned article by Dr. W. K. Carr which originally appeared in Shop Notes Quarterly. Impressions continue upon the retina of the eye, says Dr. Carr, about one-sixth of a second after the object has been moved. For this reason a point of light or flame whirled swiftly around appears as a continuous ring. Or take a piece or red ribbon, place it on white ...
— The Handy Cyclopedia of Things Worth Knowing - A Manual of Ready Reference • Joseph Triemens

... romantic object? It is a cone-shaped bit of tissue hidden away at the base of the brain in a tiny cave behind and above its larger colleague, the pituitary. Microscopic scrutiny reveals that it is made up in part of nerve cells containing a pigment similar to that present in the cells of the retina, thus clinching the argument for its ancient function as an eye. But the outstanding and specifically glandular cells are large secreting affairs, which too reach back to the tidewater days of our ...
— The Glands Regulating Personality • Louis Berman, M.D.

... farther; but, standing in the door-way, he called to the shy man who went to him, and the two talked together for a few moments. Ruth gazed upon the cow until it became so fixed upon the retina of her eye that, when she tried to admire an old Florentine cabinet near it, she still saw its portrait; and when, in desperation, she turned away to look out of the window across the sky and sloping park, the shadow of the ...
— The Danvers Jewels, and Sir Charles Danvers • Mary Cholmondeley

... for;—so that as Trim uttered the words, 'A rood and a half of ground to do what they would with,'—this identical bowling-green instantly presented itself, and became curiously painted all at once, upon the retina of my uncle Toby's fancy;—which was the physical cause of making him change colour, or at least of heightening his blush, to that immoderate degree ...
— The Life and Opinions of Tristram Shandy, Gentleman • Laurence Sterne

... that a sound is audible, when it consists of vibrations within the compass of the auditory nerve; that an object is visible, when either directly or by reflection, it sends forth luminiferous vibrations within the compass of the retina and the optic nerve. Vibrations below or above that compass make no impression at all, and the object remains invisible; as, for example, a kettle of boiling water in a dark room, though the kettle is sending forth heat vibrations closely ...
— The Yoga Sutras of Patanjali • Charles Johnston

... how two souls could become knitted and interwoven into one, but I do not believe that before this incident she had ever comprehended how her physical self, as well, had become an ever present picture upon the mind's retina of ...
— A Man and a Woman • Stanley Waterloo

... it not give a false appearance to the nose and cast shadows upward over the eyes? If this be not so, another thing is certain: namely, that the eyes of the actors suffer from the light, so that the effective play of their glances is precluded. Coming from below, the light strikes the retina in places generally protected (except in sailors, who have to see the sun reflected in the water), and for this reason one observes hardly anything but a vulgar rolling of the eyes, either sideways or upwards, toward the galleries, so that nothing but the white of the eye shows. ...
— Plays by August Strindberg, Second series • August Strindberg

... when the retina is stimulated by a bright light, is another instance of a movement, which it appears cannot possibly have been at first voluntarily performed and then fixed by habit; for the iris is not known to be under the conscious control of the will in any animal. In such cases some explanation, ...
— The Expression of Emotion in Man and Animals • Charles Darwin

... the little creature to keep me there, I cannot say, but the result was that I sat for a quarter of an hour before the altar without a movement, so that every particular of the painting is photographed on my retina. Six months later the same cat led me to a courtyard opposite the Sacristy door and ...
— A Wanderer in Venice • E.V. Lucas

... the care and thought which he bestowed upon its elaboration. Ralph Nickleby, Squeers, Smike, little Nell, Quilp, Barnaby Rudge, Steerforth, Paul Dombey, Lady Dedlock, Joe, each and all show how carefully they were elaborated; how distinctly they presented themselves to the retina of the mind of their distinguished creator. When this is borne in mind, it will be at once understood why the Mrs. Pipchin of Hablot Browne was not the Mrs. Pipchin with whose outward appearance and mental peculiarities the author himself was ...
— English Caricaturists and Graphic Humourists of the Nineteenth Century. - How they Illustrated and Interpreted their Times. • Graham Everitt

... five minutes of a walk down a city street a man has hundreds of visual images flashed upon the retina of the eye. His eye sees every little line in the faces of the passers-by, every detail of their clothing, the decorations on the buildings, the street signs overhead, the articles in the shop-windows, the paving of the sidewalks, ...
— Outwitting Our Nerves - A Primer of Psychotherapy • Josephine A. Jackson and Helen M. Salisbury

... a while, Mrs. 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 ...
— After a Shadow, and Other Stories • T. S. Arthur

... particular science which takes these matters in hand, and it is called logic; but it is not by logic, certainly not by logic alone, that the faculty I speak of is acquired. The infant does not learn to spell and read the hues upon his retina by any scientific rule; nor does the student learn accuracy of thought by any manual or treatise. The instruction given him, of whatever kind, if it be really instruction, is mainly, or at least pre-eminently, this,—a ...
— The Idea of a University Defined and Illustrated: In Nine - Discourses Delivered to the Catholics of Dublin • John Henry Newman

... non-conductive to electric waves of ordinary length. Were the energy of a Marconi sending-instrument applied to an arc-lamp, it would generate a beam of a thousand candle-power. We have thus a means of comparing the sensitiveness of the retina to light with the responsiveness of the Marconi coherer to electric waves, after both radiations have ...
— Little Masterpieces of Science: - Invention and Discovery • Various

... that of radiating or conducting away from the surface of the collision. In the eye of the observer a single impact of the atoms would cause an instantaneous flash, but if the impacts were repeated with sufficient rapidity they would produce a continuous impression upon his retina. To him then the surface of the metal would appear continuously incandescent and of constant luminous intensity, while in reality the light would be either intermittent or at least changing periodically in intensity. ...
— Experiments with Alternate Currents of High Potential and High - Frequency • Nikola Tesla

... this remarkable appearance, the elder Pliny, who was a great naturalist and a man of inquiring mind, resolved to go ashore and inspect more narrowly what was going on. But a rash resolve it proved. Steering towards Retina (now Resina), a port at the foot of the mountain, he was met, on his approach, by thick showers of hot cinders, which grew thicker and hotter as he advanced—falling on the ships along with lumps of pumice and pieces of rock, black but burning hot. Vast fragments came ...
— Wonders of Creation • Anonymous

... dense fog enfolds us, and by favor of the great curtain that the sky throws over the earth one might risk it. We are sure at least of not being seen. The fog hermetically closes the perfected retina of the Sausage that must be somewhere up there, enshrouded in the white wadding that raises its vast wall of partition between our lines and those observation posts of Lens and Angres, whence the ...
— Under Fire - The Story of a Squad • Henri Barbusse

... 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 it ...
— The Poisoned Pen • Arthur B. Reeve

... body. There is nothing but one bare, smooth, white skin. And this sightless creature, deprived of any special nervous points served by ocular power, is extremely sensitive to the light. Its whole skin is a sort of retina, incapable of seeing, of course, but able, at any rate, to distinguish between light and darkness. Under the direct rays of a searching sun, the grub's distress could be easily explained. We ourselves; with ...
— The Life of the Fly - With Which are Interspersed Some Chapters of Autobiography • J. Henri Fabre

... which is due to the fact that the circumferential and central rays have not the same focus. The human eye labours under a similar defect, and from this, and other causes, it arises that when the naked light from fifty cells is looked at the blur of light upon the retina is sufficient to destroy the definition of the retinal image of the carbons. A long list of indictments might indeed be brought against the eye—its opacity, its want of symmetry, its lack of achromatism, its partial blindness. All these taken together caused Helmholt to say that, if any optician ...
— Six Lectures on Light - Delivered In The United States In 1872-1873 • John Tyndall

... character of Michel Ardan offered a large field for physiological analysis. This astonishing man lived in a perpetual disposition to hyperbole, and had not yet passed the age of superlatives; objects depicted themselves on the retina of his eye with exaggerated dimensions; from thence an association of gigantic ideas; he saw everything on a large scale except difficulties ...
— The Moon-Voyage • Jules Verne

... flame, the like of which all the rest of nature does not afford. These eyes are a sort of looking-glasses, wherein all the objects of the whole world are painted by turns and without confusion in the bottom of the retina that the thinking part of man may see them in those looking-glasses. But though we perceive all objects by a double organ, yet we never see the objects double, because the two nerves that are subservient to sight in our eyes are but two branches that unite in one pipe, ...
— The Existence of God • Francois de Salignac de La Mothe- Fenelon

... 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 and yellow papers to revolve slowly before the eye. In this way the spot ...
— Five of Maxwell's Papers • James Clerk Maxwell

... sense impressions are literally 'impressions' or stamps made by external objects upon our organs. To see, for instance, is to be struck by an infinitely tenuous stream of images, flowing from the object and directly impinging upon the retina. Such streams are flowing from all objects in every direction—an idea which seemed incredible until the modern discoveries about light, sound, and radiation. Thus there is direct contact with reality, and consequently knowledge. Besides direct vision, ...
— Five Stages of Greek Religion • Gilbert Murray

... receiver connected with the negative pole, by the incandescence of these wires according to the different degrees of electricity we can obtain a picture, of a fugitive kind, it is true, but yet so vivid that the impression on the retina does not fade during the relatively very brief space of time the slide occupies in traveling over all the contacts. A Ruhmkorff coil may also be employed for obtaining sparks in proportion to the current emitted. The apparatus is regulated in precisely the same way as dial telegraphs, starting ...
— Scientific American Supplement No. 275 • Various

... with all its royal gloss, into the river beside her, and she could not put out a hand to catch it. She saw now all that passed, but no longer with any afterthoughts of reference to herself; so sights might slip across the retina of a dead man's eye; her identity seemed fading from her, as from some substance on the point of dissolution into the wide universe. She felt like one who, under an aesthetic influence, seems to himself careering ...
— The Atlantic Monthly, Volume 16, No. 96, October 1865 • Various

... by squinting through a viewing lens, and it's like a photo-transparency, and if you aren't careful, you'll get an eyeful of Old Blinder and back off with a punch-drunk retina. ...
— Death of a Spaceman • Walter M. Miller

... of blood vessels on to a white screen merely by turning a strong light sideways into my eye. And the explanation of it was quite simple. The retinal vessels stand out slightly in relief, and thus a perfect shadow of the system is cast on the retina. It was this shadow I saw, and the white screen was merely a convenient background for it. I don't know if I ...
— Cleo The Magnificent - The Muse of the Real • Louis Zangwill

... I know of. I have never heard of such a case. As a rule people struck blind by lightning, which is the most common cause, sometimes remember with extraordinary accuracy the last thing they have seen. Just as though it were photographed on the retina!' ...
— The Man • Bram Stoker

... from birth. Hence, the only possible way of correcting it is by the addition to the imperfect eye of carefully fitted lenses or spectacles which will neutralize this mechanical defect. To put it very roughly, if the eye is too flat to bring the light-rays to a focus upon the retina, which is far the commonest condition (the well-known "long sight," or hyperopia), we put a plus or bulging glass before the eye and thus correct its shape. But if the eye is too round and bulging, producing ...
— Preventable Diseases • Woods Hutchinson

... the lodestar of all my thoughts. Even now, I can see nothing in those feelings of mine but simple admiration—idolatry, if you will—of physical beauty. Doubtless there was more—doubtless—I had seen pretty faces before, and knew that they were pretty, but they had passed from my retina, like the prints of beauties which I saw in the shop windows, without exciting a thought—even a conscious emotion of complacency. But this face did not pass away. Day and night I saw it, just as I had seen it in the gallery. The same playful ...
— Alton Locke, Tailor And Poet • Rev. Charles Kingsley et al

... this amphibious Pope, with the wool-and-iron back, with the flesh head and hands; and endeavoured to calculate his horoscope. I reckon him the remarkablest Pontiff that has darkened God's daylight, or painted himself in the human retina, for these several thousand years. Nay, since Chaos first shivered, and 'sneezed,' as the Arabs say, with the first shaft of sunlight shot through it, what stranger product was there of Nature and Art working together? Here is a Supreme Priest who believes God to be—What, in the name of God, ...
— Past and Present - Thomas Carlyle's Collected Works, Vol. XIII. • Thomas Carlyle

... and the highest emotions, by the certainty of expiation and the fulness of atoning equity, where virtue is victorious, vice is vanquished and the ways of Allah are justified to man. They are a panorama which remains ken-speckle upon the mental retina. They form a phantasmagoria in which archangels and angels, devils and goblins, men of air, of fire, of water, naturally mingle with men of earth; where flying horses and talking fishes are utterly ...
— The Book of the Thousand Nights and a Night, Volume 10 • Richard F. Burton

... if his retina had reacted like a photographic plate, a picture developed itself, which, in the end, by a series of recurrences, became quite singularly circumstantial. The dog-cart and its occupants, with the stretch of brown road, and the hedge-rows ...
— The Lady Paramount • Henry Harland

... thought, very unconscious how clearly one of the houses on the opposite side of the street was defined on the retina of either eye, — "I have learned two things by my precious yesterday's expedition, that I didn't know before — or that if I did, it was in a sort of latent, unrecognized way; — two pretty important things! — That ...
— Hills of the Shatemuc • Susan Warner

... recitation in a very dignified and lady-like manner. The lesson was a difficult one, but the teacher seemed to understand the subject thoroughly. There was a reference to the retina of the eye in the lesson; the pupils not having studied that subject, did not know what the retina was, and called upon the teacher for explanation; she attempted to describe it, but failed to make them understand because she did not thoroughly understand it herself. With this exception, she taught very ...
— In the School-Room - Chapters in the Philosophy of Education • John S. Hart

... emporium, To which these noted picture-stealers Send all they can and meet with dealers. In many an optical proceeding The brain, he said, showed great good breeding; For instance, when we ogle women (A trick which Barbara tutored him in), Although the dears are apt to get in a Strange position on the retina, Yet instantly the modest brain Doth set them on their ...
— The Complete Poems of Sir Thomas Moore • Thomas Moore et al

... 1.40 grain euphthalmine inserted, and examination of eye grounds showed no optic atrophy. The right eye ground (retina) was slightly higher in ...
— The Attempted Assassination of ex-President Theodore Roosevelt • Oliver Remey

... grey colour of the Locust is not sufficiently conspicuous to attract attention by itself. Then let us try red, the brightest colour to our retina and probably also to the Spiders'. None of the game hunted by the Epeirae being clad in scarlet, I make a small bundle out of red wool, a bait of the size of a Locust. I glue ...
— The Wonders of Instinct • J. H. Fabre

... correct, we perceive that the very same circulatory process which, in its spasms of activity, gives rise to spots, produces in its regular course the singular "marbled" appearance, for the recording of which we are no longer at the mercy of the fugitive or delusive impressions of the human retina. And precisely this circulatory process it is which gives to our great luminary its permance as a sun, ...
— A Popular History of Astronomy During the Nineteenth Century - Fourth Edition • Agnes M. (Agnes Mary) Clerke

... further suffering. Then it happened. One of the lads, apparently startled, let off his gun. The charge struck a tree a few yards off, and the shot glanced. It did not strike him full. The face is only slightly peppered and the brain quite uninjured. But shots pierced the retina of each eye, and ...
— The Rosary • Florence L. Barclay

... account for such phenomena?) there floated into view before my retina a reproduction of the picture I had seen, or imagined myself to have seen, in the supper-room; and as at that time it opened before me an unknown vista quite removed from the surrounding scene, so it did now, and I beheld again in faint outlines, and ...
— The Woman in the Alcove • Anna Katharine Green

... marry. Very likely she will. She certainly ought to if she has the desire; and she has time enough yet if the right man only thinks so. It is rather on the system I am pondering than on the individual, though the vision of Josie at thirty unwedded, and a little hard and worn, haunts my retina and makes me feel philosophical. Away down in the bottom of my boots or my soul, or wherever a man can most safely harbor a secret reflection, has long lain a feeling of wonder that the world continues to put its daintiest, most cherished, and most carefully tended daughters through the ...
— The Opinions of a Philosopher • Robert Grant

... meet its smooth, slightly hot surface; he wrenched it away and fumbled desperately at the slide. A beam, pale but wavering, shot out into the darkness as he succeeded in his effort, and by its light, as men in moments of emotion may see some one thing or action painted on their retina by a lightning flash, he saw Archelaus bringing his stick, muffled in a coat, down on Ishmael's head. The next second the blow fell—there had not been time for Archelaus to check the impetus of the blow when the discovering light flared onto him. ...
— Secret Bread • F. Tennyson Jesse

... points of difference. The crystalline lens in the higher cuttle-fish consists of two parts, placed one behind the other like two lenses, both having a very different structure and disposition to what occurs in the vertebrata. The retina is wholly different, with an actual inversion of the elemental parts, and with a large nervous ganglion included within the membranes of the eye. The relations of the muscles are as different as it is possible to conceive, and so in other points. Hence it is not a little difficult ...
— On the Origin of Species - 6th Edition • Charles Darwin

... inherited imperfections. First, hypermetropia, or morbidly long sight: in this affection, the organ, instead of being spherical, is too flat from front to back, and is often altogether too small, so that the retina is brought too forward for the focus of the humours; consequently a convex glass is required for clear vision of near objects, and frequently even of distant ones. This state occurs congenitally, or at a very early age, often in several children of the same family, ...
— The Variation of Animals and Plants under Domestication - Volume I • Charles Darwin

... thrown into the very opposite condition; if the eye fatigue itself by gazing intently on the disc of any bright color, and the eyelids close, the very opposite, or antagonistic color will be depicted upon the retina: in like manner, when our waking thoughts—in connection with the nerve matter, which is their material instrument—have exhausted their energy, we can easily conceive how the very opposite condition will be produced. Hence the most unconnected ...
— Harper's New Monthly Magazine, Volume 2, No. 12, May, 1851. • Various

... of the tent, he twists his eyes away so far, that, from the front, little else than their whites can be seen. But enough of the retina is uncovered to receive an impression from behind; this showing the mestizo tilting his cup, and spilling its contents ...
— The Death Shot - A Story Retold • Mayne Reid

... one of these quick glances that he experienced a blinding flash upon his retina. A second later it occurred again, and then a third time. Suspiciously the man drew his horse to a stand, and ...
— The Free Range • Francis William Sullivan

... in each of these blinding intervals his figure. Each flash outlined it sharply on her retina—always the same—patient, resourceful, silent and unwearied. The man who had been directed to ride her own horse she never caught sight of. When they reached open country and better going her guide did not break the silence. He spoke ...
— Laramie Holds the Range • Frank H. Spearman

... is presented to the retina of the eye, the looking- glass of the brain, upside down, and it is by study that begins at birth, and is finished ere remembrance commences, that the child of God and man is able to detect the true relation of material things to himself. We have not yet learned the importance or ...
— Brook Farm • John Thomas Codman

... in the water, her face raised to the blind friendly mountains, she would go dreaming far afield. Little vignettes of London would come and go on the inner retina; smiles and sighs ...
— Robert Elsmere • Mrs. Humphry Ward

... structure of the eye and ear in exact confirmity to the laws of optics and acoustics, shows as clearly as any experiment can show anything, that the source, cause or origin is common both to the properties of light and the formation of the lenses and retina in the eye—both to the properties of sound and the tympanum, malleus, incus and stapes of the ear. No doubt whatever can exist upon the subject, any more than, if we saw a particular order issued to a body of men to perform certain uncommon evolutions, and afterwards saw the ...
— The Fallen Star; and, A Dissertation on the Origin of Evil • E. L. Bulwer; and, Lord Brougham

... mounted in Farrant's solution or glycerine. The kidney may be treated in the same way. The cornea of the eye can be readily cut by embedding in paraffin, and the section may be mounted in Farrant's solution. The crystalline lens and retina ...
— Scientific American Supplement, No. 492, June 6, 1885 • Various

... afternoon sun, streaming in through the window, must have shone on the boot in such a manner as to give it a momentary and fictitious aspect of redness. If Mr. Downing recollects, he did not look long at the boot. The picture on the retina of the eye, consequently, had not time to fade. I remember thinking myself, at the moment, that the boot appeared to have a certain reddish tint. ...
— Mike • P. G. Wodehouse

... involuntary motion which supply that tract with vitality, suddenly to be gifted with the exquisite sensitiveness to their own processes which is produced by its correlative object in some organ of special sense—the whole organism assimilating itself to a retina or a finger-tip. Sleep now disappeared. This initiated an entire month during which the patient had not one moment of ...
— The Opium Habit • Horace B. Day

... 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 fares any ...
— Five Years Of Theosophy • Various

... consideration of the proprieties of which impressions, we may collect these short definitions of Colours: That Blue is an impression on the Retina of an oblique and confus'd pulse of light, whose weakest part precedes, and whose strongest follows. And, that Red is an impression on the Retina of an oblique and confus'd pulse of light, whose strongest part precedes, and whose ...
— Micrographia • Robert Hooke

... analogy between the structure of the optic nerve, and the structure of the olfactory nerves and other sensitive nerves, and is completely disproved by the physiological observations of Treviranus, who has shown that no such analogy exists: that the ends of the nervous fibres in the retina being elevated into distinct separate papillae, enable us to perceive the extension, and discriminate the position of visible bodies, while the nerves of the other senses being less delicately defined, are not fitted to furnish us with any such perception, ...
— Blackwood's Edinburgh Magazine, No. CCCXXXII. - June, 1843.,Vol. LIII. • Various

... drawing his hand from his waist-coat, and placing on my desk a letter—the very letter I had seen in Rosine's hand—the letter whose face of enamelled white and single Cyclop's-eye of vermilion-red had printed themselves so clear and perfect on the retina of an inward vision. I knew it, I felt it to be the letter of my hope, the fruition of my wish, the release from my doubt, the ransom from my terror. This letter M. Paul, with his unwarrantably interfering habits, had taken from the portress, ...
— Villette • Charlotte Bronte

... phenomena, ordained that these several phenomena should proceed from the beginning in parallel lines side by side in a constantly corresponding harmony. The sense of seeing results, it appears to us, from the formation of a picture upon the retina. The motion of the arm or the leg appears to result from an act of will; but in either case we mistake coincidence for causation. Between substances so wholly alien there can be no intercommunion; and we only suppose that the object seen produces the idea, and that the desire produces the ...
— Short Studies on Great Subjects • James Anthony Froude

... on my retina as I sprang forward; but I drew the revolver which had occasioned Winston's mirth when Molly gave it to me at Brig, and in an instant the picture had dissolved. The man in brown dropped the ruecksack, ...
— The Princess Passes • Alice Muriel Williamson and Charles Norris Williamson

... Courtiers there present were invisible. For indeed it is well said, 'in every object there is inexhaustible meaning; the eye sees in it what the eye brings means of seeing.' To Newton and to Newton's Dog Diamond, what a different pair of Universes; while the painting on the optical retina of both was, most likely, the same! Let the Reader here, in this sick-room of Louis, endeavour to look with ...
— The French Revolution • Thomas Carlyle

... mole furnishes an example. Its eyes also have become small and are deeply hidden in the muscles, although they are by no means as much degenerated as in the Proteus anguineus, and are still possessed of a lens and a retina. Their nerve of vision, however, has become very imperfect, and its connection with the brain is interrupted, so that the animal for this reason can have no perception of light. Notwithstanding the above, however, it is doubtful whether the degeneration and gradual ...
— Scientific American Supplement, No. 664, September 22,1888 • Various

... was like magic, the sudden blotting out of the slim human figure, the substitution of the draped form as she moved from the light into the shadow. But on Kingozi's retina remained the vision of her as she was. He shifted, caught ...
— The Leopard Woman • Stewart Edward White et al

... Switzerland, in Italy, in some lovely place, he would feel all right. But always he saw her seated in that room, alone, deserted, playing the piano, reading, with no prospect of company, of change. Mrs. Chepstow had acted her part well. She had stamped a lonely image upon the retina ...
— Bella Donna - A Novel • Robert Hichens

... embroidery and lace, without emotion! How can the tons of gold and silver plate that once belonged to John Company, Bahadur, and that now repose on the groaning board of the Great Ornamental, amid a glory of Himalayan flowers, or blossoms from Eden's fields of asphodel, be reflected upon the eye's retina without producing positive thrills and vibrations of joy (that cannot be measured in terms of ohm or farad) shooting up and down the spinal cord and into the most hidden seats of pleasure! I certainly can never ...
— Twenty-One Days in India; and, the Teapot Series • George Robert Aberigh-Mackay

... corpse for some time, impressing a picture of it in every detail on his mental retina. Struck by an idea, he bent over and touched the patch of blood in the dead man's breast, then looked at his finger. There was no stain. The blood was quite congealed. Then he tried to unclench the judge's right hand, but ...
— The Hampstead Mystery • John R. Watson

... change their key now and then, on penalty of getting out of tune or losing their voices. You know, I suppose,—he said,—what is meant by complementary colors? You know the effect, too, which the prolonged impression of any one color has on the retina. If you close your eyes after looking steadily at a RED object, you ...
— The Autocrat of the Breakfast-Table • Oliver Wendell Holmes, Sr. (The Physician and Poet not the Jurist)

... up of the perceptions of the senses. It is scarcely too paradoxical to say that they are psychologists for whom the soul does not exist. One thing, they know, exists: the sensation flashed through the brain, the image on the mental retina. Having found that, they bodily omit all the rest as of no importance, trusting to their instinct of selection, of retaining all that really matters. It is the painter's method, a selection made almost visually; the method of the painter who accumulates ...
— Figures of Several Centuries • Arthur Symons

... Rosco saw it not. At least it made no sensible impression on him. His mental retina was capable of receiving only two pictures: the concentrated accumulation of past sin—the terrible anticipation of future retribution. Between these two, present danger and suffering ...
— The Madman and the Pirate • R.M. Ballantyne

... understood, that for the purpose of representing still-nature, or mere momentary states of objects in motion, a picture truly drawn, truly coloured, and which is either very large to correct the divergence of light and convergence of visual axes, or if small, as viewed through a glass, would affect the retina exactly as the realities. But the desideratum still remained of being able to paint motion. Now this too has been recently accomplished, and in many cases with singular felicity, by making the picture transparent, and throwing lights ...
— The Mirror of Literature, Amusement, and Instruction - Vol. 14, Issue 405, December 19, 1829 • Various

... was revolving through the air, that even the ground was gone from under his feet. His ears buzzed. His legs moved heavily and irregularly. Waves of blood, light and darkness, succeeded one another on the retina of his eye. ...
— Friars and Filipinos - An Abridged Translation of Dr. Jose Rizal's Tagalog Novel, - 'Noli Me Tangere.' • Jose Rizal

... record my literary calamity as a warning to my sedentary brothers. When my eyes dwell on any object, or whenever they are closed, there appear on a bluish film a number of mathematical squares, which are the reflection of the fine network of the retina, succeeded by blotches which subside into printed characters, apparently forming distinct words, arranged in straight lines as in a printed book; the monosyllables are often legible. This is the ...
— Literary Character of Men of Genius - Drawn from Their Own Feelings and Confessions • Isaac D'Israeli

... advanced the following theory of these instinctive reactions. Animals of the type of those mentioned are automatically orientated by the light in such a way that symmetrical elements of their retina (or skin) are struck by the rays of light at the same angle. In this case the intensity of light is the same for both retinae or symmetrical ...
— Darwin and Modern Science • A.C. Seward and Others

... infinitesimal fraction of a second seemed to set the entire visible firmament ablaze, and caused every detail of the brig's hull and equipment to imprint a clear and perfectly distinct picture of itself upon the retina. They all listened for thunder, but none came. Suddenly, however, a few heavy drops of rain pattered upon the deck, and an instant later down came a perfect deluge with the sound of millions of small shot roaring ...
— Dick Leslie's Luck - A Story of Shipwreck and Adventure • Harry Collingwood

... axis of the eye gradually grows longer. This lengthening is accompanied by stretching of the eyeball, and such children always run the risk of the inner and most important part of the wall of the eye, the retina or nerve layer, being torn away, and blindness resulting. When nearsightedness is discovered early, and glasses are given that make distant vision normal, and all needless near work forbidden, the myopia ...
— Five Lectures on Blindness • Kate M. Foley

... it was merely a congestion of the retina—for which no cause could be assigned; and that he would be cured in less than a month. That he was to have a seton let into the back of his neck, dry-cup himself on the chest and thighs night and morning, and take a preparation of mercury three times a day. Also that he must go to ...
— The Martian • George Du Maurier

... experience of the facts denoted; they cannot be defined, but only exemplified. A sort of genetic definition may perhaps be attempted, as if we say that colour is the special sensation of the cones of the retina, or that blue is the sensation produced by a ray of light vibrating about 650,000,000,000,000 times a second; but such expressions can give no notion of our meaning to a blind man, or to any one who has never seen a blue object. Nor can we explain what heat is like, or the smell of tobacco, to ...
— Logic - Deductive and Inductive • Carveth Read

... as preposterous and hardly credible; but with the utmost respect for his knowledge as the rock from which all other knowledge is hewn, it must be admitted that many well-proved facts are dark to the average man, even concerning the action of his own heart and the structure of his own retina. A century ago he and all his forefathers had not had the slightest notion of that electric discharge by means of which they had all wagged their tongues mistakenly; any more than they were awake to the secluded anguish of exceptional ...
— Daniel Deronda • George Eliot

... explore the shelf, when something went whizzing past his head, and, embedding itself in a stunted oak behind him, shook and quivered with the shock,—a Tonto arrow. Only an instant did he see it, photographed as by electricity upon the retina, when with a sharp stinging pang and whirring "whist" and thud a second arrow, better aimed, tore through the flesh and muscles just at the outer corner of his left eye, and glanced away down the hill. With one spring he gained the edge of the shelf, and shouted to the scouts to come on. ...
— Starlight Ranch - and Other Stories of Army Life on the Frontier • Charles King

... stimulus in general produces a diminution of current of rest, or a negative variation (e.g. muscles and nerves), yet, in certain cases, there is an increase, or positive variation. This is seen in the response of the retina to light. Again, a tissue which normally gives a negative variation may undergo molecular changes, after which it gives a positive variation. Thus Dr. Waller finds that whereas fresh nerve always gives negative variation, stale nerve sometimes gives positive; and that retina, which when ...
— Response in the Living and Non-Living • Jagadis Chunder Bose

... between Carlotta and Le Moyne was very quiet. She had been making a sort of subconscious impression on the retina of his mind during all the night. It would be difficult to tell when ...
— K • Mary Roberts Rinehart

... along the path of the sensori- motor processes in the brain and are afterwards projected into P. There is not, however, an unextended image which forms itself in consciousness and then projects itself into the position P. Really, the point P, and the rays which it emits, together with the retina and nervous elements affected in the process of perception, all form a single whole. The point P is an indispensable factor in this whole and it is really in P and not anywhere else that the image of P is formed and perceived.[Footnote: Cf. Matter and Memory, p. 37 (Fr p. 31), also paper ...
— Bergson and His Philosophy • J. Alexander Gunn

... which all the particles appear to be at perfect rest? How could we, even by the assistance of a telescope, see the most distant stars, if there was not a progressive motion of light from these stars to the retina ...
— The System of Nature, Vol. 1 • Baron D'Holbach

... corpuscles. In the work just referred to regarding this matter, he asks the question, "Are not rays of light very small bodies emitted from shining substances?" These small particles or corpuscles were supposed by him to actually strike the retina of the eye, and so produce the sensation of Sight, in the same way that odorous particles entering the nostril, come into contact with the olfactory nerves and produce the sensation of Smell. In order, however, to account for ...
— Aether and Gravitation • William George Hooper

... mere envy and design. Then into the Great Garden up to the Banqueting House; and there by my Lord's glass we drew in the species very pretty. [This word is here used as an optical term, and signifies the image painted on the retina of the eye, and the rays of light reflected from the several points of the surface of objects.] Afterwards to nine- pins, Creed and I playing against my Lord ...
— The Diary of Samuel Pepys • Samuel Pepys

... mucous membranes; it sometimes causes decay of the bones; it may cause disease of the internal organs, such as the liver and lungs; it affects the walls of the blood vessels, causing them to become hard and brittle (atheroma); it causes disease of the eyes, especially of the iris and retina, tumors (or gummata) in the brain, paralysis etc. In fact, it spares none of ...
— The Sexual Question - A Scientific, psychological, hygienic and sociological study • August Forel

... province of the metaphysician, but to that of the professor of optics. The lens of the camera obscura transmits the figures to the prepared paper, on quite the same principle on which in vision the crystalline lens conveys them to the retina. In the centre of the field in both cases there is much distinctness, while all around its circumference the images are indistinct and dim. We have but to fix the eye on some object directly in front of us, and then attempt, without removing ...
— Leading Articles on Various Subjects • Hugh Miller

... and grasp this fact. If we analyse our sense of sight, we find that the only impression made on our bodies by external objects is the image formed upon the retina; we have no cognisance of the separate electro-magnetic rills forming that image, which, reflected from all parts of an object, fall upon the eye at different angles, constituting form, and with different frequencies giving colour ...
— Science and the Infinite - or Through a Window in the Blank Wall • Sydney T. Klein

... precision are now in constant use, among the most wonderful of which perhaps is the ophthalmoscope, whereby we are enabled to subject the retina and the intervening media of the eye to minute visual examination. There is not an organ of the body that is not now interrogated daily in the way of physical diagnosis, and we even examine separately the secretion of each of the two kidneys. In addition, there are multitudinous specific signs ...
— Beacon Lights of History, Volume XIV • John Lord

... needs be flattened to get it on one retina. The picture of a solid thing, although it is flattened and simplified, is not necessarily a lie. Surely, surely, in the end, by degrees, and steps, something of this sort, some such understanding, as this Utopia must come. First here, then there, ...
— A Modern Utopia • H. G. Wells

... as well as downwards. These are relics of old surgery, and very rarely practised by any oculists of eminence, as, though easy to perform, and with very flattering immediate results, the risks of chronic inflammation of the whole globe and injury to the retina are very great. ...
— A Manual of the Operations of Surgery - For the Use of Senior Students, House Surgeons, and Junior Practitioners • Joseph Bell

... cold nor sound, but is made in terms of size, shape, and inherent qualities; for at least every object appears to my fingers standing solidly right side up, and is not an inverted image on the retina which, I understand, your brain is at infinite though unconscious labour to set back on its feet. A tangible object passes complete into my brain with the warmth of life upon it, and occupies the same place that it does in space; for, without egotism, the mind is ...
— The World I Live In • Helen Keller

... appear as if expressly designed in view of one another. Thus the woodpecker's bill, tongue, feet, tail, etc., fit him wondrously for a world of trees with grubs hid in their bark to feed upon. The parts of our eye fit the laws of light to perfection, leading its rays to a sharp picture on our retina. Such mutual fitting of things diverse in origin argued design, it was held; and the designer was always treated ...
— Pragmatism - A New Name for Some Old Ways of Thinking • William James

... the beauties of a region which leaves the other quite cool. For he who has not something of the artist about him, who cannot paint beautiful landscapes in his head, will never see any outside. Beautiful nature, this most subjective of all works of art, which is painted on the retina of the eye instead of on wood or canvas, will differ every time according to the mental viewpoint of the onlooker; and as it is with individuals so it is with whole generations. The comprehension of the artistically beautiful is not half ...
— The German Classics of The Nineteenth and Twentieth Centuries, Vol. VIII • Various

... closed, no visual disturbances can be sensed, nevertheless, as a matter of fact the eye-lids are not wholly opaque. Sight may be obtained through them, as you may prove by closing your eyes and moving your fingers before them. The lids transmit light to the retina and it is quite likely that you are frequently awakened by a beam of light falling upon your closed eye-lids. For this reason, one who is inclined to be wakeful should shut out from the bed-room all avenues whereby light may enter as ...
— How to Use Your Mind • Harry D. Kitson

... principle, the unsubstantiality of substance, the immateriality of matter, the mutability of all that seems most fixed, the unreality of all things, save that which was once the emblem of unreality, the play of line and colour, and their impression upon the retina of the eye. "If I live to be a hundred, I shall be able to draw a line," said Hokousai. It was as if he had said, "I shall be ...
— The Origins and Destiny of Imperial Britain - Nineteenth Century Europe • J. A. Cramb

... more than the ground surge beneath the countless waves of sound. For the voice of the jungle is the voice of love, of hatred, of hope, of despair—and in the night-time, when the dominance of sense-activity shifts from eye to ear, from retina to nostril, it cries aloud its confidences to all the world. But the human mind is not equal to a true understanding of these; for in a tropical jungle the birds and the frogs, the beasts and the insects are sending out their messages so swiftly ...
— Edge of the Jungle • William Beebe

... difficulty with regard to our ideas and objects. When an object augments or diminishes to the eye or imagination from a comparison with others, the image and idea of the object are still the same, and are equally extended in the retina, and in the brain or organ of perception. The eyes refract the rays of light, and the optic nerves convey the images to the brain in the very same manner, whether a great or small object has preceded; ...
— A Treatise of Human Nature • David Hume

... strange incident connected with Mr. Walsh's misfortune was reported abroad, but I do not vouch for its truth. When under surgical treatment for his impaired vision, it was said that the operators in consultation decided on an experiment to test the powers of the retina to receive light, and in so doing blinded the other eye. Mr. Walsh went to England, having had a sum granted to him by the Victoria government. Whether he has recovered ...
— Successful Exploration Through the Interior of Australia • William John Wills



Words linked to "Retina" :   rod cell, visual cell, macula, membrane, central artery of the retina, blind spot, cone cell, neuroepithelium, retinal rod, cone, optic, retinal cone, yellow spot, macular area



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