VETERINARY OPHTHALMOLOGY. 45 



Must differentiate between this and abscess of the 

 cellular tissue. In abscess, pressure will not reduce 

 it, while in dacnjocystitls iMegmonosa the contents 

 will be forced througli the puncta or down into the nose. 

 And remember the previous history of long lachryma- 

 tion. 



Treatment is incision into the sac, and in ad- 

 vanced cases (which are the only ones you will meet) 

 this is the only treatment. Thrust the knife per- 

 pendicularly down to the bone and carry the incision 

 down as far as necessary. Keep the incision open 

 with lint. If it has opened spontaneously, poultice 

 for twenty-four hours, but not too long; maybe forty- 

 eight hours of hot poulticing, but no longer. After 

 this opening has closed it will be necessary to open the 

 nasal duct and establish a passage for tears. Don't 

 probe until subsidence of inflammation. 



Lachryinal Fistula. — Result of an illy-healed abscess, 

 and indicates the existence of a permanent stricture. 

 Rarely seen. If possible, the re-establishment of the 

 proper channel for the passage of tears should be the 

 primary care. Then the fistula can be easily healed, 

 treating as you would a sluggish fistula anywhere, 

 stimulating its edges with lunar caustic, etc. 



