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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    ately makes its appearance and thus brings tbo lesion promptly to the surgeoir’s notice. The injury or inflam- mation may be very slight and much time and care may be reqnired for its detection; hence, in every case of ciliary congestion the cornea shonld be subjected to a thorongh examination. If nothing abnormal is found in the cornea by the methods presently to be described in detail, the cause of the circnmcorncal congestion must be sought in irritation or inflammation of the iris or ciliary body (iritis, cyclitis). The foregoing description applies to general congestions affecting the entire area of distribution of each System of blood-vessels; in addition, we have to consider the local or circntnscribed congestions whicli occur in both Systems and whicli may be limited to a small area. This happens, in the case of the conjnnctiva, when tliere is a local, circum- scribed lesion—for example, a slight wonnd or localized in- flammation in the form of an eCzema-pustule(phlyctenule)— instead of a general process affecting the entire mucous membrane, as, for instance, in acute catarrh. Under such circumstances the hyperemia, which is superficial and yel- lowish-red in color, is limited to the immediate neighbor- hood of the injury or inflammatory center; or, to be ac- curate, to the System of vessels in the affected area. Tn a localized ciliary congestion the appearance is differ- ent. The color isdarker and more blnish ; the vessels can scarcely be made out; and the color does not disappear upon pressure witli the finger on the eyelid as readily as in conjunetival congestion. Circumscribed ciliary con- gestion is cansed by inflammation of the sclera, which usually is circumscribed, or by a deep wound of long Standing in the sclera. It is this aceurate knowledge of the differences between the varions forms of congestion which enables the practised cxaminer to diagnose a given case witli a rapidity which astonishes the beginner. lA)r instance, he recognizes con- junctival catarrh at a glanoe by the abnormal color at the inner canthus, in the region of the earuncle, plica semi-