The commoner diseases of the eye : how to detect and how to treat them . Fourth Stage of Corneal repair. The marginal epitheliumhas covered the scar, even extendinginto its substance. holds the head upright the hypopyon is at the bot-tom of the anterior chamber and appears there asa grayish white streak or it may extend to themargin of the pupil. If the patient lies downthe pus gravitates to the outer portion of theanterior chamber. The amount of purulent liquid varies; some-times it almost fills the anterior chamber, whileat other times the amount is so small that it canonly be
The commoner diseases of the eye : how to detect and how to treat them . Fourth Stage of Corneal repair. The marginal epitheliumhas covered the scar, even extendinginto its substance. holds the head upright the hypopyon is at the bot-tom of the anterior chamber and appears there asa grayish white streak or it may extend to themargin of the pupil. If the patient lies downthe pus gravitates to the outer portion of theanterior chamber. The amount of purulent liquid varies; some-times it almost fills the anterior chamber, whileat other times the amount is so small that it canonly be detected on close examination. Thequantity of pus in no way depends upon the ex-tent and severity of the ulcer. This so-called COMMONER DISEASES OF THE EYE pus is often really sterile since it is not, as arule, derived from the ulcer itself. The mem-. Corneal Ulcer with Hypopyon. brane of Descemet forms a barrier that does notallow any foreign material to penetrate into theanterior chamber. The hypopyon is mostly madeup of leucocytes derived from the iris, whichwander from the bloodvessels of that structureand accumulate in the anterior chamber; some-tin us the liquid of the hypopyon is very thick,at other times it is quite watery. COMMONER DISEASES OF THE CORNEA 109 Deep ulcer is usually round and varies insize. Its floor is covered with pus; its edgesare frequently swollen and surrounded by agrayish infiltration. It has no tendency tospread, but its chief disposition is to open intothe anterior chamber. When perforation isabout to occur actual bulging of Descemetsmembrane into the cavity of the ulcer may beobserved on close inspection. When perforation takes place the aqueous*!humor gushes out; the iris is pushed forwardand either becomes entangled in the cornealopening, or (especially if the perforation beperipheral) suffers pro
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