336 The Farmer's Veterinary Adviser. 



Calabar beau, and 1 qt. water, changing twice daily ; bli? 

 ter the face or neck as for enzootic ophthalmia. 



EECUEEING OPHTHALMIA. PERIODIC OPHTHALMIA. 

 MOON-BLINDNESS. 



Attacks solipeds only. 



Causes. Hereditary predisposition ; breeding in damp, 

 cloudy, foggy or marshy localities ; keeping in damp, close, 

 ill-conditioned stables ; the irritation about the head at- 

 tendant on teething; clogging the digestive organs bj 

 feeding wheat or maize without salt or sulphate of soda 

 the presence of worms in the intestines ; whatever lowers 

 the general health, and the general causes of iritis. 



Symptoms. Like those of internal ophthalmia with, in 

 many cases, increased tension and hardness of the eyeball, 

 and its deeper retraction into the orbit. The main- differ- 

 ence is in the habUity to recur, at intervals of three weeks, 

 a month or more, if the exciting causes have not been 

 removed, until the subject is left bhnd. In the intervals 

 between the attacks the transparent coat of the eye retains 

 a hazy bluish cloudiness around its border, the iris is 

 wanting in its normal lustre, the anterior chamber has 

 often a slight deposit at its lower part, and the upper eye- 

 lid is bent at an unnatural angle about one-third of its 

 length from the inner angle. After two or three attacks 

 a cataract remains. 



Prevention. Avoid, for breeding purposes, all horses 

 belonging to an affected family; all localities that are 

 damp, foggy, cloudy or relaxing ; as well as ill-appointed 

 stables. Maintain good health and condition by sound 

 feeding, watering, housing, grooming and exercise. When 

 threatened remove to a drier and more bracing climate. 



Treatment. As for iritis. Some cases, like rheumatism, 

 are benefited by colchicum and the free use of alkahea 

 (carbonates or acetates of potassa or soda). Those that 

 present increased tension and hardness of the eyeball 

 should be early treated by iridectomy which can, however 



