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Updated: May 13, 2025
In this defect the axis of the eye, or the distance between the cornea and the retina, is too long and the rays of light are brought to a focus in front of the retina. The tendency to short-sightedness exists in many cases at birth, and is largely hereditary. It is alarmingly common with those who make a severe demand upon the eyes. During childhood there is a marked increase of near-sightedness.
The thin, muscular ring which lies between the cornea and crystalline lens, giving the eye its special color. A disorder in which the skin and eyes assume a yellowish tint. The process by means of which the more complex elements are rendered more simple and less complex. The opposite of anabolism. Labyrinth. The internal ear, so named from its many windings.
One makes a transverse incision above the cornea " "I know, I know," interrupted Kingozi. "But the pilocarpin will give me my sight. Let us get at it." Three hours later Kingozi stepped into the open, his vision cleared. Such is often the marvellous though temporary effect of the proper remedies in this disease.
Redness, scurf, and eruptions were on almost every part. Apply the mange ointment and the alterative and physic balls. On the following day there was an ulcer on the centre of the cornea, with much appearance of pain and impatience of light. Apply an infusion of digitalis, with the liquor plumbi diacetatis.
His medical friends at first supposed that cataracts were formed in the crystalline lens, and anticipated a cure from the operation of couching. These hopes were fallacious. The disease turned out to be in the cornea, and every attempt to restore its transparency was fruitless. In a few months the white cloud covered the whole aperture of the pupil, and Galileo became totally blind.
"'You're right, Alf, says I; 'it's a flake of rust, about the size of a fish's scale, lodged on the coloured part, which we term the iris or, strictly speaking, on that part of the cornea which covers the iris. But I can't shift it with this appliance. Must get something sharper. "So I took a pin out of my coat, and grubbed the mote as well as I could by the deficient light.
In dislocation of the lens into the anterior chamber as the result of a blow, the lens appears like a large drop of oil lying at the back of the cornea, the margin exhibiting a brilliant yellow reflex. Partial dislocations of the lens as the result of severe blows generally terminate in cataract. 5. =Of the Throat.= Very frequently inflicted by suicides.
The opening in the fore part of this opaque coat is filled by the transparent cornea, which resembles a watch crystal in shape, and is received into a groove in the front part of the sclerotic coat in the same manner that a watch-glass is received into its case. But for this arrangement light could not gain admission to the eye.
He also 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.
The operation is not without difficulties, and one is inclined to agree with Elliot who says that "The man who can make a 'finished iridectomy' quietly and cleanly has graduated as an ophthalmic operator." The difficulties of an iridectomy are especially pronounced in those cases in which the anterior chamber is extremely shallow and the iris is pressed against the cornea.
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