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Updated: May 13, 2025
For hair, like all horny substances, is a dead product of external secretion by the animal organism. An ur-phenomenal example of it, showing its kinship to glass-like substances, is the transparent cornea of the eye, close to the crystal-lens.
The iris, as a rule, hangs free from the cornea, often tremulous because of retraction of the lens beyond the iris plane. In some cases the iris is partly or totally adherent to the posterior surface of the cornea. Detachment of the retina may occur, often preceded by or accompanied by subretinal hemorrhage.
It was plainly visible by the opthalmoscope eighteen months after the accident, when as yet no diminution of sight was apparent. Smyly speaks of a portion of a tobacco pipe which was successfully removed from the anterior chamber by an incision through the cornea.
I thought, monsieur le secretaire-general, I would reserve that honour for you." Prasville put out his hand, took the thing up and inspected it. It was a block of crystal, imitating nature to perfection, with all the details of the eyeball, the iris, the pupil, the cornea. He at once saw a movable part at the back, which slid in a groove. He pushed it. The eye was hollow.
In certain star-fishes, small depressions in the layer of pigment-cells are filled with transparent gelatinous matter projecting with a convex surface like a rudimentary cornea, and this, it has been suggested, may serve, not only to form an image, but to concentrate the luminous rays.
When it does occur it takes place in corneæ that have suffered from keratitis. The alteration is usually in the form of ectasiæ. Often, however, the enlargement of the cornea is irregular. Increase in tension may produce fissures in Descemet's membrane. These occur more frequently in the cornea that have suffered a change in shape, as in buphthalmos.
Occasionally one or two drops of this solution may be introduced into the eye for the purpose of removing opalescence of the cornea. In cases of fungoid matter being thrown out on the cornea, the fungus may be touched with a rod of nitrate of silver, and little pain will follow.
"I'm Congregational, myself," Young said, when our work was finished; "at least I was brought up that way; an' I'm down on th' Scarlet Woman from first t' last. But I go in for lettin' folks believe what they've got a mind to; an' when it cornea t' buryin' 'em it's only square t' give 'em th' sort of send-off that they'd really like.
The external organs of sense are the coverings of the immediate organs of sense, and are mechanically adapted for the reception or transmission of peculiar bodies, or of their qualities, as the cornea and humours of the eye, the tympanum of the ear, the cuticle of the finders and tongue.
Erasmus Wilson speaks of it as ichthyosis sebacea cornea. H. G. Brooke describes a case in a girl of six. The first sign had been an eruption of little black spots on the nape of the neck. These spots gradually developed into papules, and the whole skin took on a dirty yellow color.
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