Text-book of ophthalmology . eration, consisting of a complete exenteration of the orbit and the removal ofall discoverable glands, was performed, nevertheless only a few months afterwardenlarged glands were again observed. Since then, (in February, 1890) the woman hassuccumbed to an extension of the growth to the internal organs. Cylindromata also occur, although very rarely, in the conjunctiva. The plica semilunaris and the caruncle which is situated upon it participate in theinflammations of the conjunctiva, so that it is unnecessary to treat of the disease ofthese parts separately. Sometim
Text-book of ophthalmology . eration, consisting of a complete exenteration of the orbit and the removal ofall discoverable glands, was performed, nevertheless only a few months afterwardenlarged glands were again observed. Since then, (in February, 1890) the woman hassuccumbed to an extension of the growth to the internal organs. Cylindromata also occur, although very rarely, in the conjunctiva. The plica semilunaris and the caruncle which is situated upon it participate in theinflammations of the conjunctiva, so that it is unnecessary to treat of the disease ofthese parts separately. Sometimes the little hairs which the caruncle always has uponit are so long as to irritate the eye; in that case the hairs must be epilated. The newformations of the caruncle are designated by the old name encanthis;21 benign newformations, such as simple polypoid or papillary outgrowths of the caruncle, are calledencanthis benigna; malignant new formations are called encanthis maligna. 21 From iv, in, and Kav96g, angle of the CHAPTER IIDISEASES OF THE CORNEA Anatomy 186. The cornea, together with the sclera, represents the outer fibrousenvelope of the eyeball, of which the cornea forms the transparent from in front, the cornea has the form of a horizontal ellipse, the hori-zontal diameter of its base, which is 12 mm., surpassing the vertical diam-eter, which is 11 mm. It is thinner in the center than at the edges, whereits thickness amounts to about 1 mm. Hence it follows that the curvatureof the posterior surface is somewhat greater than that of the anterior. Thelatter has on the average a radius of curvature of mm. Since the radiusof curvature of the whole eye ismore than this—amounting, infact to 12 mm.—the curvature ofthe cornea is greater than that ofthe rest of the eyeball; the corneatherefore rests on the sclera likea watch crystal. The same com-parison also obtains for the mpfnnrl in wninn iha nnvnon FlG- 72-—Epithelium of the Cornea. (After H. me
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