Atlas of the external diseases of the eye : including a brief treatise on the pathology and treatment / by O. Haab ; authorized translation from the German ; edited by G.E. de Schweinitz.

  • Haab, O. (Otto), 1850-1931.
Date:
1903
Catalogue details

Licence: In copyright

Credit: Atlas of the external diseases of the eye : including a brief treatise on the pathology and treatment / by O. Haab ; authorized translation from the German ; edited by G.E. de Schweinitz. Source: Wellcome Collection.

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    lunaris, and adjoining conjunctiva. In anothercase, guided solely by the ciliary congestion, he promptly locates the seat of the inflammation or injury in the cornea, although the injured spot is barely visible. He then looks for further signs of the morbid process, and in a short time the diagnosis is fornmlated and even the etiology deter- mined. For instance, a patient enters the room with the charaeteristic alopecia and red blotches on the forehead, along the 1 ine of the hair, strongly suggestive of Syphilis. There is a ciliary congestion in one eye; on further in- spection the pupil is found to he irregulär in outline (instead of round) from serrations which encroach on the papillary border, and in the iris there are yellowish-red, thickened areas. The diagnosis of syphilitic iritis is reached in less time tlian it takes to read this example. Not to anticipate, however, we will proceed to describe the method of examining that important structure, the cornea, which is such a frequent seat of disease. Bxamination of the Cornea.—We determine two things : First, the condition of the surface; and, second, the transparency. The surface of the normal cornea aets like a small con- vex mirror in reflecting a sharply defined, small upright Image of objects placed in front of it with the usual dis- tortions incident to convex mirrors. Thns the iraage of window-bars reflected from the corneal mirror of a patient seated before the snrgeon appears slightly bent (convex), but clear-cut and distinct. This Image of the window- bars is utilized to test the condition of the corneal surface, by allowirig it to fall consceutively on different parts of the cornea. The patient is reqnired to follow the upliftcd finger as it is moved up and down and to either side while the snrgeon watches the reflection in the cornea and is able to detect the slightest inequality in its surface. Such slight irregularities are not uncommon, and may he of several kinds: 1. The innige in one part of the cornea, without heilig :it all distorted, may appear somewhat indistinct; the