. A treatise on the diseases of the eye. y margin and anterior capsule of the form of iritis occurs idiopathically, or in constitutional syphilis, or asone of the signs of a rheumatic or gouty taint.—B.] 2. Serous Iritis (syn. Descemetitis, aquo-capsulitis, keratitis punctata, etc.)is chiefly distinguished by the absence of plastic exudation, and by the greattendency to hypersecretion of the aqueous humor. The symptoms of acuteiritis are generally not very pronounced. The aqueous humor is secreted ingreater quantity, and is somewhat clouded and turbid, and on closer observa-tion we c
. A treatise on the diseases of the eye. y margin and anterior capsule of the form of iritis occurs idiopathically, or in constitutional syphilis, or asone of the signs of a rheumatic or gouty taint.—B.] 2. Serous Iritis (syn. Descemetitis, aquo-capsulitis, keratitis punctata, etc.)is chiefly distinguished by the absence of plastic exudation, and by the greattendency to hypersecretion of the aqueous humor. The symptoms of acuteiritis are generally not very pronounced. The aqueous humor is secreted ingreater quantity, and is somewhat clouded and turbid, and on closer observa-tion we can often notice small particles of lymph floating about in it, beforebecoming deposited on the posterior surface of the cornea, or at the bottomof the anterior chamber. The latter is often markedly deepened, and thecornea appears somewhat bulged forward. The cloudiness of the aqueoushumor often varies considerably and rapidly within the course of a fewhours. The cornea may at first appear abnormally brilliant, but it soon [Fit;-. After Dalrymple.] loses its lustre and becomes slightly clouded, and small punctate opacitiesmake their appearance upon its posterior surface. [Fig. 107.] These maybe situated opposite the pupil, being perhaps grouped in a small circle; butthey are generally arranged in the form of a pyramid, the base of which isturned towards the periphery of the cornea, and its apex towards the centre;the smaller opacities being situated at the apex, and the larger and coarserones at the base. This ])roves that the opacities are composed of smallmasses of lymph, deposited from the aqueous humor upon the ])osterior wallof the cornea, and that they arrange themselves according to their size andweight, the larger and heavier ones gravitating downwards. The truth of INFLAMMATION OF THE IRIS. 279 this assertion has moreover been proved experimentally by Arlt.^ He placedthe head of the patient in different directions, sometimes keeping it for alength of time turned
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