532 DISEASES OF THE CORNEA 



When the condition becomes chronic silver preparations are 

 useful. An autogenic vaccine has been used with good 

 results and may be given every four or five days. 



Give the patient plenty of good, nourishing food, occasional 

 laxatives, and small daily doses of potassium iodid (0.016- 

 0.032). 



Keratitis Punctata Profunda. Definition. An inflamma- 

 tion of the deeper layer of the cornea appearing in the form 

 of multiple, small spots. It is more common in the horse and 

 dog than in other animals. 



Etiology. The cause has not been determined. It may be 

 produced by specific infection and inflammation spreading 

 from adjacent parts. 



Symptoms. Numerous small opacities or spots are noted 

 in the depths of the cornea. They are visible to the naked 

 eye, or are seen better with a reading glass, with oblique or 

 direct illumination. The spots are mostly circular, well 

 defined, evenly distributed, or more or less grouped. In 

 color they are usually white, occasionally darker. The rest 

 of the eye appears normal. 



Prognosis. Unfavorable. 



Treatment. No treatment is of avail. 



Suppurative Keratitis. 



Ulceration of the Cornea. Definition. A destruction of 

 the substance of the cornea, the result of infection with pus. 

 The ulcers vary in size, some are not larger than a pin point; 

 others involve a large part of the cornea. 



Etiology. The causes of ulceration are varied. Wounds 

 of the cornea, even though slight, form ports of entry for 

 infection. In small animals the cornea is frequently injured 

 by foreign Kodies which enter the lid sac, by being bitten or 

 scratched by other animals, or from an inversion of the 

 eyelashes. 



The undue exposure of the cornea which accompanies 

 lagophthalmus, exophthalmus, and paralysis of the fifth 

 nerve is a predisposing cause. Ulceration of the cornea 

 accompanying or following infectious diseases, especially 



