400 Veterinary Medicine. 



rabbits and dogs, and both the iris and choroid reflect a pink 

 tint. It may cause photophobia and some weakness of vision 

 but, in the main, it seems to be harmless to the lower animals. 

 In horses it is occasionally seen as a partial defect, a portion only 

 of the iris and adjacent sclerotic appearing of a brilliant white 

 color. It does not usually seem to impair the vision, so that at 

 the worst, it is only looked on as a blemish. It is needless to at- 

 tempt a remedy. 



PERSISTENT PUPILLARY MEMBRANE. 



The persistence of this embryonic membrane has been noticed 

 in the horse (Schindelka), ox (Meyer), rabbit (Mayerhausen), 

 and dog (Moller). It tends to disappear with the growth of the 

 animal and rarely does an}^ perceptible harm. 



OCCLUDED PUPIL. 



This has been frequently found in horses as a sequel of iritis, 

 and permanent adhesion of the contracted iris to the front of the 

 lens capsule. It is in short, a posterior synechia witli closure of 

 the pupil. The lens and its capsule are usually opaque so that 

 there would be no gain in detachment of the iris. If, however, 

 there is reason to conclude that any part of the lens is still trans- 

 parent, the performance of iridectomy over this portion, would 

 produce a new aperture for the entrance of light. 



CYCLITIS. 



This is described by Moller as occurring in the domestic ani- 

 mals, but he fails to furnish instances of its diagnosis during 

 life, and it is not likely to be often recognized in the living ani- 

 mal. Beside the usual signs of iritis, there is extreme tender- 

 ness to pressure around the anterior border of the sclera, increase 



