388 Veterinary Medicine. 



Treatment is by iridectomy and eserin if the disease can be 

 recognized in its earliest stages, but it is rarely satisfactory. 

 I^ater the choice may be between excision of the staphyloma and 

 coaptation of the edges of the wound by suture, and the enuclea- 

 tion and removal of the eyeball. The last resort is preferable to 

 the continued irritation of the staphyloma by the lids and cilia 

 under the ocular movements. 



ECTASIA CORNER. KERATOCONUS. CONICAL 



CORNEA. 



This consists in a thining and protrusion of the cornea in the 

 form of a blunt cone, without lo.ss of transparency. It has ac- 

 cordingly been called staphyloma pellucida. There is a gradual 

 attenuation and distension of the corneal tissue from some un- 

 known cause. It has been seen mainly in the young and is 

 manifestly due to a trophic defect. Stockfleth records a case in 

 a foal and Bayer in a cow. No satisfactory treatment has been 

 proposed, but as the trouble usually comes to a stand.still without 

 perforation, it can be left to take its course. With rapid in- 

 crease and manifest tension antiseptic puncture of the cornea or 

 even iridectomy might be tried. 



KERATOGEOBUS. 



This is a variety of ectasia in which the clear, pellucid, pro- 

 truding cornea is more globular and less conical in outline. It 

 is seen especially with enlargement of the entire eyeball {buph- 

 thabyius) . 



TUMORS OF THE CORNEA. 



Various tumors maj' grow from the cornea. Dermoid cysts 

 may implicate the cornea and demand excision. Malignant 

 growths demand extirpation of the eyeball. 



