Text-book of ophthalmology . isfirmer than its physiological connection with the tissue of the iris. Ifseveral synechias have been ruptured, we find remains of them in the shapeof a corresponding number of brown dots arranged in a circle upon theanterior capsule of the lens (Fig. 171, between and on either side of a and6). This circle is narrower than the mean diameter of the pupil, because thesynechiae were formed at the time when the pupil was contracted by dots of pigment never disappear, and hence during the whole life giveevidence of an iritis that has once existed. It happens
Text-book of ophthalmology . isfirmer than its physiological connection with the tissue of the iris. Ifseveral synechias have been ruptured, we find remains of them in the shapeof a corresponding number of brown dots arranged in a circle upon theanterior capsule of the lens (Fig. 171, between and on either side of a and6). This circle is narrower than the mean diameter of the pupil, because thesynechiae were formed at the time when the pupil was contracted by dots of pigment never disappear, and hence during the whole life giveevidence of an iritis that has once existed. It happens sometimes that posterior synechiae develop in the presence of a dilated, in-stead of contracted, pupil; as, for example, when they form in an eye under the influenceof atropine. In this case the margin of the pupil becomes adherent to the capsule of thelens at some peripherally located spot, so that afterward, when the pupil assumes itsmeanwidth, the synechia is marked, not by a projecting process, but by a re-entrant Fig. 171.—Posterior Synechia and Remains of Fetal Pupillary Membrane. Magnified pupil has been dilated by the instillation of atropine. The dilatation, however, is unequal,because the upper part of the pupillary margin is fixed by means of adhesions to the anterior capsuleof the lens. At a there is a slender synechia which is drawn out into a fine black point; at b, on theother hand, is found a broad and but slightly elongated adhesion, such as frequently occurs, especiallyin syphilitic iritis. Between the synechiae, and by the side of them, the capsule of the lens is coveredwith minute black dots arranged in a semicircle. They correspond to the situation oi the pupillarymargin when the pupil was contracted, and have been left by the rupture of the adhesions. From thelower part of the iris a filament, c, runs straight upward. This arises from the trabecular of the circulusiridis minor, and passes in the region of the pupil to the anterior capsule
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