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Updated: May 13, 2025
"A substance which I can place in the cornea to supply the loss of the crystalline matter." The German went off into a roar of laughter so long and loud that the lady could not help laughing. I should have liked to join them, but I was ashamed to be thought the patron of this ignorant fellow, so I preserved a gloomy silence.
Insert the blade of a pair of sharp scissors at the junction of the sclerotic rotic coat with the cornea and cut from this point nearly around the entire circumference of the eyeball, passing near the optic nerve. Spread open in the water and identify the different parts from the description in the text. Open the second eyeball in water by cutting away the cornea.
The image P' of a distant object P falls in front of the retina even without accommodation. There is an optical condition of the eye known as astigmatism, in which the cornea is usually at fault. In this defect of vision the curvature of the cornea is greater in one meridian than in another. As a result the rays from an object are not all brought to the same focus.
Neither can it be otherwise; for the Cuticle, from its transparency, must necessarily transmit the colour of the substance beneath it, in the same manner, though not in the same degree, as the cornea transmits the colour of the iris of the eye. This transparency is a matter of ocular demonstration in white people.
The discomfort is only of temporary duration; the agreeable warmth of the after-glow exhilarates both mind and body, and with the disappearance of the difficulty to the rear cornea the satisfaction of having found it no harder to overcome.
At its outer surface the cornea is covered with a very thin layer of the epidermis; this is known as the conjunctiva. It goes from the cornea over the inner surface of the eye-lids, the upper and lower folds which we draw over the eye in closing it. Underneath the upper eye-lid are the lachrymal glands, the product of which, the lachrymal fluid, keeps the outer surface of the eye smooth and clean.
Testa perforata, depresso-convexa, laevigata, nitidiuscula, pallide cornea, basi subcompressa; anfractus 6, planiusculi; spira obtusa; apertura lunaris; peristoma rectum, simplex, margine columellari reflexo: umbilicus minutus, subobtectus. Diam. maj. 8 min. 7 alt. 5 mill.
As the disease proceeds, and even at a very early period of its progress, an ulcer appears on the centre; at first superficial, but enlarging and deepening until it has penetrated the cornea, and the aqueous humour has escaped. Granulations then spring from the edges of the ulcer, rapidly enlarge, and protrude through the lids.
Calhoun mentions an instance of a little Esquimaux dog whose head was seized between the jaws of a large Newfoundland with such force as to press the left eyeball from the socket. The ball rested on the cheek, held by the taut optic nerve; the cornea was opaque. The ball was carefully and gently replaced, and sight soon returned to the eye.
The progressive derangement of your liver manifested itself in increased sallowness of face and cornea; the organ was working on an inadequate vital supply because the organic nervous system was becoming paralyzed; the veins were not strained of that which is the bowels' proper purgative and the blood's dire poison. You had sealed up all but a single excretory passage the pores of the skin.
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