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Updated: June 29, 2025
Auricular fibrillation may occur in hearts which are suffering from valvular lesions, especially mitral stenosis, and may occur in syphilitic hearts, in various sclerotic conditions of the heart, and in hyperthyroidism. Though disputed, it seems probable that fibrillation may be caused by the excessive use of tea, coffee and tobacco.
The sclerotic coat covers the greater portion of the larger spherical segment and is recognized in front as "the white of the eye." It is composed mainly of fibrous connective tissue and is dense, opaque, and tough. It preserves the form of the eyeball and protects the portions within.
He lay with closed eyes, breathing nasally. Ho-Pin, his face a smiling, mirthless mask, bent over the bed. Adeptly, he seized the right eyelid of M. Max, and rolled it back over his forefinger, disclosing the eyeball. M. Max, anticipating this test of the genuineness of his coma, had rolled up his eyes at the moment of Ho-Pin's approach, so that now only the white of the sclerotic showed.
The lachrymal gland which secretes the tears keeps the above parts moist. The eye is the essential organ of vision. It is formed by a spherical shell which encloses fluid or semisolid parts. The shell is anteriorly made up of a transparent convex membrane, the cornea, while the remainder of its wall is formed by three opaque layers or tunics. The external tunic is the sclerotic.
The hair, though rarely affected, may present a mottled appearance. There seems to be no constitutional disturbances, no radical change in the skin, no pain in fact, no disturbance worthy of note. The eye is not affected; but in a negro the sclerotic generally appears muddy.
His death could not have been laid to his grief over Aileen exactly, for he was a very large man apoplectic and with sclerotic veins and arteries. For a great many years now he had taken very little exercise, and his digestion had been considerably impaired thereby. He was past seventy, and his time had been reached.
In ordinary conditions of the eye, this ligament is kept tense so that the front part of the lens is flattened somewhat by the pressure on it. All around the edge, where the cornea, sclerotic, and choroid meet, is a ring of involuntary muscular fibers, forming the ciliary muscle.
Between the ciliary processes and the sclerotic coat is a small muscle, containing both circular and longitudinal fibers, called the ciliary muscle. The iris is a continuation of the choroid coat across the front of the eyeball. It forms a dividing curtain between the two spherical segments and gives the color to the eye.
To this coat, which serves as a kind of framework for the eye, are attached the muscles which move the eyeball. In front of the globe, the sclerotic passes into a transparent circular portion forming a window through which one can see into the interior. This is the cornea.
Reese's Manual of Toxicology. If an eye removed from its socket be stripped posteriorly of the sclerotic coat, an inverted image or the field of view will be seen on the retina; but if the lens or other part of the refractive media be removed, the image will become blurred or disappear altogether.
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