96 OPHTHALMOLOGY FOR VETERINARIANS 



the best of these are the yellow oxid of mercury ointment, 

 4 to 8 grains to the ounce, or the red iodid of mercury 

 ointment, i grain to the ounce. In all ointments for the 

 eye the drug should be well incorporated with the base, 

 and ground evenly and smoothly, as the smallest free 

 particle of the drug will produce much irritation, the 

 same as a foreign body. Iodoform is often used in the 

 form of an ointment in strength of from 2 to 25 per cent. 

 The base is often made of vaselin alone, but equal parts 

 of vaseHn and lanohn are better. In applying the 

 ointments, place a piece about the size of a pea on the 

 everted lower lid and draw the upper hd over it, after 

 which use gentle massage over the closed lids. Oint- 

 ments of standard strengths are now put up by supply 

 houses in tube containers which are very convenient. 



Heat is always indicated in ulcer of the cornea. This 

 is best applied by pieces of cotton wrung out in boiling 

 water and placed over the closed Hds, as hot as they can 

 be borne by the hand. In acute cases this should be done 

 every hour or two, and before using other treatment. 



Atropin should always be used if the ulcer is centrally 

 located, but if it be near the margin of the cornea a 

 myotic is indicated. 



The eye should be protected with a pad, and if the 

 ulcer is a deep one a pressure bandage should be used. 



When rupture of the cornea seems inevitable the best 

 method is to hasten it by a Saemisch operation. This is 

 done by passing the point of a Von Graefe cataract 



