The student's guide to diseases of the eye . Fig. 51.—Vessels of human iris artificially injected ; capillariesmost numerous at pupillary border, and next at ciliary border. and in such cases there are generally other pecu-liarities. The condition of the pupil alone is diagnostic inall except very mild or incipient cases of iritis. Itis sluggish or quite inactive, and not quite round; itis also rather smaller than its fellow (supposing theiritis to be one-sided), because the surface of the irisis increased (and the pupil, therefore, encroached on)whenever its vessels are distended (p. 29). Atr
The student's guide to diseases of the eye . Fig. 51.—Vessels of human iris artificially injected ; capillariesmost numerous at pupillary border, and next at ciliary border. and in such cases there are generally other pecu-liarities. The condition of the pupil alone is diagnostic inall except very mild or incipient cases of iritis. Itis sluggish or quite inactive, and not quite round; itis also rather smaller than its fellow (supposing theiritis to be one-sided), because the surface of the irisis increased (and the pupil, therefore, encroached on)whenever its vessels are distended (p. 29). Atro-pine causes it to dilate between the synechiee; thesynechiae, being fixed, appear as angular projectionswhen the iris on each side of them has retracted. If IRITIS 117. Fig. 52.—Iritic adhesions (poste-rior synechia?) causing irregu-larity of pupil. (Wecker andJaeger.) there be only one adhesion it will merely notch thepupil at one spot; if the adhesions be numerous thepupil will be crenated or irregular (Fig. 52). If thewhole pupillary ring,or still more, if theentire posterior sur-face, of the iris be ad-herent, scarcely anydilatation will be ef-fected; the former con-dition is called annularor circular synechia,and its result is ex-clusion of the pupil;the latter is known astotal posterior synechia. If the synechiae are new andthe lymph soft the repeated use of atropine willcause them to give way, and the pupil will becomeround; but even then some of the uveal pigment,which is easily separable from the posterior surfaceof the iris, often remains behind, glued to the lens-capsule by a little lymph (Fig. 53). The presenceof one or more such spots of brownpigment on the capsule is alwaysconclusive proof of present or ofpast iritis. The pupillary ar
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Keywords: ., bookcentury1800, booksu, booksubjecteye, booksubjectophthalmology
