Elements of pathological anatomy . bursting of an abscess or ulceration, the corneaforms a whitish, pearl-colored projection, of a sphe-rical figure, and often of considerable membrane is unequally thickened ; its laminararrangement destroyed ; its texture generally moreor less softened ; and numerous vessels can be seentowards its circumference, and sometimes even to?-wards its centre. In this variety the anterior cham-ber of the eye is annihilated ; the iris is torn intoradiated fragments; and vision is lost or impaired,according to the extent of the projection and theopacity o
Elements of pathological anatomy . bursting of an abscess or ulceration, the corneaforms a whitish, pearl-colored projection, of a sphe-rical figure, and often of considerable membrane is unequally thickened ; its laminararrangement destroyed ; its texture generally moreor less softened ; and numerous vessels can be seentowards its circumference, and sometimes even to?-wards its centre. In this variety the anterior cham-ber of the eye is annihilated ; the iris is torn intoradiated fragments; and vision is lost or impaired,according to the extent of the projection and theopacity of the membrane. (Fig. 113.) Dupuytren, a few years ago, described what he calls an encysted tumor ofthe cornea. He observed it in a child who had been struck on the eye a fewweeks before with a stone. It grew between the lamellae of the membrane,and was distended with a serous fluid, which was reproduced in a fortnightafter it had been evacuated. This, I believe, is a solitary instance of such atumor in such a situation. Fig. * Soe WarJrap, Op rit., p. 13G. 3S8 BALL OF THE EYE. The sclerotic coat is a strong, dense membrane, belonging to the same classof textures as the pericardium, the periosteum, and the dura mater. It. isopake, of a dull whitish tint, consists of a single lamella, and is composed offirm, inelastic filaments so intimately interwoven as to render it impossible tounravel them. Behind, it is perforated by the optic nerve ; in front, it has alarge opening, which is occupied by the cornea. Externally it is convex, andcovered with fine, cellular tissue, which connects it with the conjunctiva: itsinternal surface is smooth, glistening, and lies in apposition with the choroid. The sclerotic coat has no sensibility in its natural state, and no nerves havebeen traced into it. The vessels which it receives are also few in little behind the cornea it is pierced by the anterior ciliary arteries ; and theposterior ciliary vessels pass through it, around the
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