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The margin of the iris is firmly connected with the eyeball all round, at the junction of the sclerotic and the cornea. The Retina. The third and innermost coat of the eyeball is the retina. This is the perceptive coat, without which it would be impossible to see, and upon which the images of external objects are received.
Sexual excitement is one among many causes intellectual excitement, pain, a loud noise, even any sensory irritation which produce dilatation of the pupils and enlargement of the palpebral fissure, with some protrusion of the eyeball. The influence of the sexual system upon the eye appears to be far less potent in men than in women.
This makes the eyeball a "stronger" lens so that the rays of light can be brought to a focus upon the retina. This action is known as accommodation, or adjustment; and you can sometimes feel it going on in your own eye, as when you pick up a book or a piece of sewing and bring it up quickly, close to the eye, in order to see clearly.
In former days there was an old-fashioned manner of fighting called "gouging." In this brutal contest the combatant was successful who could, with his thumb, press his opponent's eyeball out. Strange to say, little serious or permanently bad results followed such inhuman treatment of the eye.
He waited. The fellow rose now so that the fence came just below his lips, which were full and curved in the pleasant lines of youth. His eyes kept moving this way and that, so that the whites showed with each turn of the eyeball. Starr studied what he could see of the face.
These canals unite to form the nasal duct, which conveys the tears to the nasal cavity on the same side of the nose. When by evaporation the eyeball becomes too dry, the lids close reflexively and spread a fresh layer of tears over the surface. Any excess is passed into the nostrils, where it aids in moistening the air entering the lungs.
These are made by a gland-sponge up under the upper lid, so as to wash any dust or sand or other harmful speck out of the eye before it can hurt the sensitive eyeball. Now look at some one's eyeball. It is like the picture, isn't it? bright white around the edge and then a ring of color, brown or blue or gray; and inside the color-ring, or iris, a little round black hole that we call the pupil.
According to the edema theory advanced by Fischer, glaucoma is "essentially an edema of the eyeball, and for its production we must hold responsible the same circumstances which are responsible for a state of edema in any other part of the body."
This time, the laying takes place on one of the eyes, between the lid and the eyeball. At the hatching, which again occurs a couple of days later, the grubs make their way into the fleshy depths of the socket. The eyes and the beak, therefore, form the two chief entrances into feathered game. There are others; and these are the wounds.
This was almost too much for some of his admirers and worshippers. One of his most ardent and faithful followers, whose gifts as an artist are well known, mounted the eyeball on legs, and with its cornea in front for a countenance and its optic nerve projecting behind as a queue, the spiritual cyclops was shown setting forth on his travels.
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