DISEASES OF THE IRIS AND CILIARY BODY 113 



This change of color is not as marked in dark-colored 

 irides as in those of a hghter color. A bluish iris be- 

 comes greenish in color. The iris loses its luster and its 

 fine Hnes are less distinct. If this hyperemic condition 

 goes on to a more severe type of inflammation, exuda- 

 tion occurs and the iris becomes muddy in appearance. 

 This exudation is composed of leukocytes and other 

 inflammatory debris which settle to the bottom of the 

 anterior chamber, where it may be seen as a whitish line, 

 and varies from one barely visible to one filling the cham- 

 ber. The more of this exudate there is present, the more 

 clouded the iris appears. Not infrequently the blood- 

 vessels rupture, and the blood settles in the most de- 

 pendent portion of the anterior chamber, as does the 

 exudate. Blood in the anterior chamber is called 

 hyphemia. The exudate is often deposited on the 

 posterior surface of the cornea and the anterior surface 

 of the lens' capsule, which produces a grayish appear- 

 ance to the pupillary area. It sometimes undergoes a 

 fibrinous change, and the pupillary area is occluded by 

 an apparent membranous formation. 



In types of a mild, slow, chronic nature, and more 

 particularly when the uveal tract is involved, the 

 exudate may be seen by the aid of a strong lens de- 

 posited, as pin-point dots or larger, on the posterior 

 layer, even when, to the unaided eye, it may appear 

 clear. This precipitates to the bottom of the anterior 

 chamber and forms a pyramid mass. That thrown out 



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