Text-book of ophthalmology . of recurring attacks of iritis, which little by little produce a moreand more extensive adhesion of the iris to the lens. The direct consequenceof an annular synechia is the shutting off of the anterior from the posteriorchamber—shutting off of the; pupil (seclusio pupillce). DISEASES OF THE IRIS AND CILIARY BODY 403 The two sequelae of iritis, shutting off of the pupil (seclusio pupillae) andshutting up of the pupil (occlusio pupillse), very often occur togetherowing to the fact that the exudate which attaches the pupillary margin tothe lens may also extend over t
Text-book of ophthalmology . of recurring attacks of iritis, which little by little produce a moreand more extensive adhesion of the iris to the lens. The direct consequenceof an annular synechia is the shutting off of the anterior from the posteriorchamber—shutting off of the; pupil (seclusio pupillce). DISEASES OF THE IRIS AND CILIARY BODY 403 The two sequelae of iritis, shutting off of the pupil (seclusio pupillae) andshutting up of the pupil (occlusio pupillse), very often occur togetherowing to the fact that the exudate which attaches the pupillary margin tothe lens may also extend over the entire pupil (Fig. 172). But they mayalso occur separately and then have very different consequences. Occlu-sion of the pupil occurring by itself produces very great diminution ofsight, without, however, entailing any dangers for the future. Seclusionof the pupil in itself does not affect the sight, if the pupil is free frommembrane, but subsequently induces changes (increase of tension) whichcause blinding of the Fig. 172.—Seclusion and Occlusion of the Pupil. Magnified 5X1. The iris is adherent by its entire pupillary margin to the lens, but elsewhere is pushed posterior chamber, h, is thus made deeper, the anterior chamber, v, shallower, especially at theperiphery where the root of the iris, a, is pressed against the cornea by the increase of tension. In con-sequence of the traction made upon the iris, its retinal pigment is beginning to separate (at s) and tobe left upon the capsule of the lens. The pupil is closed by an exudate membrane, o, by the shrinkingof which the anterior capsule is thrown into folds. In the lower part of the anterior chamber there ismatter, P, precipitated upon the posterior surface of the cornea. In consequence of the increase .ntension, both the ciliary processes, c, and the ciliary muscle, m, are atrophic and flattened. The cortexof the lens has undergone cataractous disintegration, and at r is separated from the capsule
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