l6o OPHTHALMOLOGY FOR VETERINARIANS 



confined to the eyeball or the region about the eye. 

 The globe is reddened and the large episcleral vessels 

 are engorged. The cornea is hazy in appearance, and 

 the pupil is enlarged and sluggish. The anterior cham- 

 ber is shallow and the iris is pushed forward. The prog- 

 nosis is extremely bad. 



This type is often secondary to diseases of the eye, 

 such as iritis with adhesions, hemorrhages in the retina 

 and chorioid, and to traumatism. It is also one of the 

 conditions which accompanies recurrent ophthalmia in 

 the horse. 



Treatment. — The object in the treatment of glaucoma 

 is to reheve the pressure from Schlemm's canal and 

 re-estabhsh its function. In order to do this with a 

 drug we must use a myotic, or one which causes a 

 contraction of the pupil. Eserin in solution of J to ^ 

 per cent., or pilocarpin in solution of i per cent., may be 

 dropped into the eyes three times daily. In simple 

 glaucoma this treatment is about all that is necessary, 

 though it will have to be continued for months or 

 perhaps years. 



In inflammatory glaucoma the same drugs are used, 

 but if pain exists, as it most always does, it will be 

 necessary to do an iridectomy. To get the best results 

 a broad excision of the iris should be made near its base 

 or root. The tension is often immediately reduced 

 following this operation. A too sudden reduction of 

 the tension may do harm, as the sudden inrush of blood 



