I20 OPHTHALMOLOGY FOR VETERINARIANS 



is incision of the cyst at the corneal margin with a 

 proper knife-needle. Of course, the same aseptic 

 precautions must be observed as in all operative pro- 

 cedures. 



Tuberculosis of the Iris. — This has occurred as a result 

 of general infection in the smaller animals, and as a 



Fig. 26. — Photograph of carcinoma of the orbit of a cat. (Veter- 

 inary Record, vol. xvii, p. 694, " Proceedings of the Central Veter- 

 inary Medical Society.") 



spontaneous localization of disease in cattle. In Hess' 

 case ''the left eye was shrunken to half the size of the 

 sound eye, and the small caseated nodules were present 

 in both iris and chorioid." There are usually co-existing 

 tubercles in other organs, and these, together with the 

 nodular swellings of the iris, may assist in the diagnosis. 



