56 



color of the pupil when visible during its contraction is 

 greyish green. Atropine causes the iris to expand slowly, 

 weakly and irregularly; at points the pupillary border of the 

 iris adheres to the capsule of the lens ; the remaining parts are 

 free; expansion of the pupil under such conditions produce 

 irregularities in the iris and in the outline of the pupil (see 

 fig. 17). At the lower part of the aqueous humor, in the an- 

 terior chamber, there is a gray-yellow, partly sedimentary, 

 partly floccu.lent exudate, which sometimes is colored with 

 blood. The quantity of the exudate varies; in the early 

 stage of the attack — especially in the later attacks — it is 

 visible by focal illumination as a slight cloudiness; at the 

 height, or severest stage, of the attack the aqueous chamber 

 is almost entirely filled ; the exudate settles to the lower part 

 of the aqueous humor, and is gradually absorbed and en- 

 tirely disappears in the course of ten to fifteen days. 



No prominent changes are exhibited in the conjunctiva; 

 however, the pigmentation of the conjunctiva of the eye ball 

 makes it difficult to observe variations in its blood vessels. 

 Occasionally the conjunctiva becomes swollen and produces 

 a slimy, serous secretion. In cases where the vitreous humor 

 can be observed in the early stage of the attack it is found 

 to be clouded. In the active, inflammatory stage, the eye 

 ball is found, by palpation, to be sensitive and hard. Opac- 

 ity of the lens appears during the later attacks, and, as a 

 rule, when the lens become entirely opaque (total cataract) 

 the periodic attacks cease in that eye. In six to eight days 

 after the beginning of the attack the inflammatory appear- 

 ances begin to subside, the sensitiveness to light and extra 

 flow of tears abate; the exudate in the anterior eye-chamber 

 begins to disappear; the pupil begins to expand and the 

 iris may react with regularity. After about fourteen days 

 from the beginning of one of the early attacks the inflamma- 

 tory changes will have so completely disappeared that casual 

 observation fails to discover anything abnormal in the re- 



