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Cornea   Listen
Cornea  n.  (pl. corneas)  (Anat.) The transparent part of the coat of the eyeball which covers the iris and pupil and admits light to the interior. See Eye.

Collaborative International Dictionary of English 0.48

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"Cornea" Quotes from Famous Books

... wild in their brightness, stared directly at me. And what eyes they were! The membrane grew red and redder until it was of the color of blood, standing out in frightful contrast with the transparency of the cornea. The pupil gradually dilated until it seemed about to burst out of the socket. The nostrils, which had been sunken and motionless, quivered, swelled, and glowed. The respiration became short, quick and gasping. ...
— The Junior Classics Volume 8 - Animal and Nature Stories • Selected and arranged by William Patten

... own waters that are close kin to the Pelew islander mentioned by Semper, and which are not blind. Along the middle of their backs, over the edge of each segment, there is an oblong dark spot. This little collection of coloring-matter is covered by a transparent membrane, the cornea, and has a special nerve leading to the brain, if I may use the word. These spots are primitive eyes, the analogues of which are preserved by many of the true worms. I am inclined to believe that Semper would find primitive ...
— The Dawn of Reason - or, Mental Traits in the Lower Animals • James Weir

... Intoxicants. What are some of the physical results observed? First, we note the failure of the vaso-motor nerves to maintain the proper tone of the blood-vessels, as in the turgid face and the congested cornea of the eye. Again, we observe the loss of muscular control, as is shown by the drop of the lower lip, the thickened speech, and the wandering eye. The spinal cord, too, is often affected and becomes unable to respond to the demand for reflex action, ...
— A Practical Physiology • Albert F. Blaisdell

... particularly fishes; they are at least incomparably more like them than the eyes of any known insects; yet they are distinguished by several extraordinary peculiarities. The front of the eye-ball is covered with a loose membrane instead of a cornea; the iris is composed of a firm substance; and a process projects from the upper margin of the pupil, which gives that membrane a semilunar form."[11] The exterior coat or ball is remarkably strong, so as to seem almost calcareous, and is, when taken out, of a brilliant pearl colour; it is ...
— The Mirror of Literature, Amusement, and Instruction - Volume 20, No. 562, Saturday, August 18, 1832. • Various

... properties, and when transferred to the eye works such lamentable mischief. Without their existence the inoculation of pus in the healthy eye is harmless; pus bearing the gonococci excites the most intense inflammation. Similar suppurative action in the cornea is often caused by infection of cocci. The proof of causation may be found in the fact that the most effective cure now practiced for such suppuration is to sterilize them by the actual cautery. Rosenbach says that he knows six distinct microbes ...
— Scientific American Supplement, No. 787, January 31, 1891 • Various

... of sense,—the eye with its cornea and lens, vitreous humor, aqueous humor, and choroid, culminating in the retina, no thicker than a sheet of paper, and yet consisting of nine distinct layers, the innermost composed of rods and cones, supposed to be the immediate recipients ...
— The Pleasures of Life • Sir John Lubbock

... according to their size, micraesthetes and megalaesthetes. In the common species of Chiton and many others of the family Chitonidae the megalaesthetes are developed into definite eyes, the most complicated of which have retina, pigment within the eye, cornea and crystalline lens (intra-pigmental eyes) (fig. 2). The eyes are arranged in rows running diagonally from the median anterior beak of each valve to its lateral borders There may be only one such row on either side, or many rows. In some ...
— Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 - "Chicago, University of" to "Chiton" • Various

... neque enim mihi cornea fibra est Sed recti finemque extremumque esse recuso Euge ...
— The Essays of Montaigne, Complete • Michel de Montaigne

... spot seen on the cornea of the eye, when we face a window, which is much attended to by portrait painters; this is the light reflected from the spherical surface of the polished cornea, and brought to a focus; if the observer is placed in this ...
— The Botanic Garden - A Poem in Two Parts. Part 1: The Economy of Vegetation • Erasmus Darwin

... listened with keen attention when the scientists finally discussed in low tones what they had perceived, and caught the words, "White scar on the cornea," "leucoma," and "operation." He also heard Herophilus declare that an injury of the cornea by the flame of the torch was the cause of the blindness. In the work which led him to the discovery of the retina in the eye he had devoted himself sedulously to the organs of sight. This ...
— Uarda • Georg Ebers

... ovata; spira elata, acuta, tenui, cornea; anfractu ultimo magno, non ventricoso, transversim creberrime striato; apertura oblongo-ovali; labio callo tenui expanso obtecto; labro ...
— Explorations in Australia, The Journals of John McDouall Stuart • John McDouall Stuart

Words linked to "Cornea" :   tissue layer, arcus, corneal, membrane, oculus, optic, eye

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