So OPHTHALMOLOGY FOR VETERINARIANS 



the growth is extremely thin and only slightly vascular. 

 If much traction is made the movement of the eyeball 

 is interfered with, and astigmatism may result or even 

 diplopia. 



The true pterygium is loosely adherent except at 

 the apex, and, being folded in upon itself at the corneal 

 margin, a probe may be passed beneath it to the fold at 

 this point. This serves to distinguish it from a false 

 pterygium— one caused by injury. The latter is strongly 

 adherent all along its course. 



The only thing to do is to excise them. There are 

 several methods, but the simplest one is as follows: 

 Grasp the apex of the growth with a delicate forceps, and 

 dissect it carefully to the corneal margin; then make a 

 V-shaped excision of the pterygium^the apex of the V 

 toward the inner canthus. Undermine the conjunctiva 

 so that the remaining edges can be drawn together by 

 sutures, using care that it does not overlap the cornea. 

 Precede the operation with the usual antiseptic precau- 

 tions and two or three applications of a 5 per cent, 

 solution of cocain. Some cases recur. 



Foreign Bodies in the Conjunctiva and Cornea. — 

 Vegetable substances are commonly found in the folds 

 of the conjunctiva, such as seeds, particles of hay, barbs 

 from grain heads, etc. The writer saw a small seed which 

 had caught in the conjunctiva, had become covered 

 with mucus, and, when removed, was in a state of ger- 



