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Updated: June 24, 2025
The second pair are the optic nerves, which, under the name of the optic tracts, run down to the base of the brain, from which an optic nerve passes to each eyeball. These are sensory nerves, and are devoted to sight. The third, fourth, and sixth pairs proceed to the muscles of the eyes and control their movements. These are motor nerves, the movers of the eye.
Casually state that of course he knows the covering of his eyeball is identical in all important respects especially as regards sensitiveness with the lining of his stomach; in fact, of his whole interior from his mouth down. He will assent and gravely pour out his poison. Then say to him: "Just dip the tip of your finger in that whiskey and put the finger to your eye-ball."
"Why sell them," I asked, touched in spite of myself, "if you are so attached to them? Is the money indispensable to you? I might possibly make an advance." "Ah, you are a real Christian you are now," said the honest Joliet, polishing his eyeball with his coat-cuff. "The good woman holds by them, it is true. Holy Virgin! it's she that has raised them, and I may say brooded over them in the coop.
Lift up the forks of my eyebrows which have fallen over my eyeballs, that I may see the fashion of my son-in-law." Then they arose, and, as they did so, Yspaddaden Penkawr took the third poisoned dart, and cast it at them. And Kilhwch caught it, and threw it vigorously, and wounded him through the eyeball, so that the dart came out at the back of his head. "A cursed ungentle son-in-law, truly!
The insect crawled upward over the nut-brown cheek and stopped with its antennae brushing the lashes of his lower lid. You or I would have started back, closing our eyes and striking at the thing; but you and I are the slaves, not the masters of our nerves. Had the thing crawled upon the eyeball of the ape-man, it is believable that he could yet have remained wide-eyed and rigid; but it did not.
It may be blue, black, or brown, and can squeeze up so as to make the pupil very small when the light is strong. The end of the nerve of sight forms a tender pink covering over most of the inner surface of the eyeball. The cavity within the eyeball is filled with three clear substances. The lens, shaped like a flat door knob, is fixed just behind the pupil.
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.
The sclerotic coat is the outside layer and enclosing membrane of the eyeball. It is a tough, fibrous coat for the protection and maintenance of the shape of the eye. It is white and glistening in appearance, and is in part visible, to which the phrase, "the white of the eye," is applied.
While the greater portion of the eyeball is concerned in the focusing of light, the crystalline lens, operated by the ciliary muscle, serves as the special instrument of accommodation. Muscles attached to the eyeballs turn them in different directions, and so adjust them with reference to each other that double vision is avoided. *Exercises.*—1.
In some instances of supposed absence of the eyeball the eye is present but diminutive and in the posterior portion of the orbit. There are instances of a single orbit with no eyes and also a single orbit containing two eyes. Again we may have two orbits with an absence of eyes but the presence of the lacrimal glands, or the eyes may be present or very imperfectly developed.
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