Text-book of ophthalmology . mercury, which readily adheres to the concave surface of the silver. The currentintensity employed is to milliamperes (Alleman). - V. Ectasia of the Cornea 265. Just as in the case of opacities, so also in the case of ectasia? of the cornea, we must first of all distinguish whether they have been produced by inflammation or not. On the basis of this distinction we make the following subdivision of ectasia? of the cornea: „ , , . n (Staphyloma, Ectasia? of inflammatory origin i v . (^ -^ , . » . n . (Keratoconus, Ectasia? of non-inflammatory
Text-book of ophthalmology . mercury, which readily adheres to the concave surface of the silver. The currentintensity employed is to milliamperes (Alleman). - V. Ectasia of the Cornea 265. Just as in the case of opacities, so also in the case of ectasia? of the cornea, we must first of all distinguish whether they have been produced by inflammation or not. On the basis of this distinction we make the following subdivision of ectasia? of the cornea: „ , , . n (Staphyloma, Ectasia? of inflammatory origin i v . (^ -^ , . » . n . (Keratoconus, Ectasia? of non-inflammatory origin i K . , By many authors the expression staphyloma cornea? is employed in a broadersense, and all ectasia? of the cornea are designated under this name. In that case afurther division of the term is made by distinguishing the transparent ectasia? of thecornea, keratoconus and keratoglobus, under the name of staphyloma pellucidum, fromcicatricial staphylomata and from keratectasia?.21 322 TEXT-BOOK OF OPHTHALMOLOGY. Fig. 120. -Total Prolapse op the Iris. N 1. Staphyloma of the Cornea 266. Symptoms.—A staphyloma is a protuberant scar originating in aprolapse of the iris, and wholly or in part replacing the cornea. We distin-guish accordingly between total and partial staphylomata. In total staphy-loma there is found in place of the cornea an opaque, protuberant cicatrix,the base of which is encircled by the margin of the sclera or by the very out-ermost rim of the cornea, whichmay still be preserved. In oneseries of cases the protuberantcornea has the form of a cone(staphyloma totale conicum).In conical staphyloma the pro-tuberance starting from the mar-gin of the sclera slopes graduallyup to its apex (Fig. 124). Inother cases, however, the pro-tuberance is hemispherical (sta-phyloma totale sphaericum), andits walls, rising abruptly fromthe sclera or even overhangingit, are sharply demarcated fromthe latter (Fig. 121). Thespheri-cal is more frequent than theconical for
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