76 VETERINARY OPHTHALMOLOGY. 



oft' slowly alongside the instrument. The one care in 

 this is to avoid too sudden an escape of the fluid and 

 possible prolapse of the iris. Again, a too sudden 

 diminution of intra-ocular tension is apt to result in 

 shock. 



Pannus. — A vascular opacity of the cornea, non-in- 

 flammatory. A new growth — neoplasm^the result of 

 a preceding inflammation. The term is applied also to 

 acute and chronic vascular keratitis where the forma- 

 tion of new tissue is still in progress. A part or the 

 entire cornea may be involved. Two forms, remember, 

 I spoke of — tenue, thin, and crassum, thick (or beefy). 



In extreme' degrees the cornea may appear de- 

 c.idedly red and fleshy, and this condition may continue 

 for months and years with no change. The rarity is 

 complete cure, for usually a good cure leaves opacities 

 of different degrees. The cornea may become thin and 

 bulge forward. Trachoma is the cause of the majority 

 of cases of pannus, and these cases may present corneal 

 granulations similar to those upon the lids. It may 

 be traumatic from long continued irritation, such as 

 that from foreign particles, inverted cilia, etc. 



Treatment. — After removing the cause, hasten reso- 

 lution of the opacity, and to this end, if no inflamma- 

 tion be present, irritating powders and unguents are 

 used. Sometimes a too constant application of a remedy 

 wears it out and a change becomes necessary. If the- 

 entire cornea be involved, the pannus in a high state 



