Text-book of ophthalmology . iscontinuous attacks and intervening remissions, untilthe ulcer has covered the entire cornea. The latter is thus everywhere deprived ofits superficial layers, and hence remains permanently clouded throughout its entireextent, so that vision is very greatly diminished. [The ulcerated area, as Mayou remarks,shows but little tendency to fill up with new tissue and may show very little clouding.]Perforation of the cornea in this affection has never been observed. This rare diseaseattacks elderly people, and not infrequently invades both corneas either simultaneouslyor
Text-book of ophthalmology . iscontinuous attacks and intervening remissions, untilthe ulcer has covered the entire cornea. The latter is thus everywhere deprived ofits superficial layers, and hence remains permanently clouded throughout its entireextent, so that vision is very greatly diminished. [The ulcerated area, as Mayou remarks,shows but little tendency to fill up with new tissue and may show very little clouding.]Perforation of the cornea in this affection has never been observed. This rare diseaseattacks elderly people, and not infrequently invades both corneas either simultaneouslyor in succession. It was regarded as incurable as long as surgeons were unacquaintedwith the cauterization of the cornea by means of the actual cautery. If, however, wedestroy the margin of the ulcer by this means, the ulcer in most cases is brought to a cure. 12. Keratitis marginalis swperficialis is another rare disease, found in persons inmiddle life. A quite superficial ulceration spreads over the cornea, starting from its. DISEASES OF THE CORNEA 261 margin. It does not, however, start from all parts of the margin at the same time,nor does it advance uniformly. Consequently the ulcerated marginal zone of the corneais demarcated from the transparent central portion by a sinuous border formed bya fine gray line (Fig. 95). This variety of keratitis drags on for a long time—sometimesfor vears—periods of intermission alternating with relapses, which are associated withmoderate symptoms of irritation. It is distinguished from ulcus rodens in that theulcer is extremely shallow, and hence the cornea within its limits shows only a veryfaint and grayish opacity. Moreover, the edge of the ulcer, scarcely visible in any case,is not undermined. The ulceration never reaches the center of the cornea, so that theextremely faint opacities that remain do not interfere with sight. Keratitis marginalissuperficialis often gives rise to a drawing of the conjunc-tiva up over the cornea in the f
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