256 THEORY AND PRACTICE 



together and pus accumulates inside them and irritates the cor- 

 nea. The ulceration may occur in two or three places in the 

 cornea, and then the sores become confluent. Unless the lids 

 are softened and the pus let out, the cornea may be eaten 

 through and the aqueous humor escape. 



Remove the cause; reduce the conjunctivitis and touch the 

 ulcer lightly with lunar caustic once a day. In case the cornea 

 is not ruptured, granulations may form in patches on its surface 

 and these will be red as beefsteak. In such cases cauterize every 

 three days with lunar caustic. 



INFECTIOUS KERATITIS OF CATTLE. 



Keratitis is inflammation of the cornea. It is a constitutional 

 disease and one especially peculiar to cattle. It is very common 

 and often runs through a whole herd. This would indicate that 

 we have to deal with a specific germ but as yet none has been 

 found. The disease runs a regular course and it is usually be- 

 nign. 



Semciology. — Tears runs down the cheek. The eyelids arc 

 more or less swollen and the cornea is often ulcerated. Acute 

 cellulitis is also' present. The cornea is opaque. Recovery may 

 take place in 4-12 days, but in some cases the cornea may be- 

 come ruptured, the aqueous humor escape and the eye becomes 

 destroyed. 



Treatment. — Keep the patient in the dark. Apply warm fo- 

 mentations with salt water. Do not let the iris remain in one 

 position too long a time. Inject a little atropine to dilate the 

 pupil and if it does not contract in a few days then use calabar 

 bean. After the inflammation has run its course use sulphate of 

 zinc lotion. Give laxatives and soft food. 



FILARIA OCULI. 



The filaria is a little thread-like worm which is sometimes 

 found in the anterior chamber of the eye. This is especially 

 seen in Canada. It is not known how the parasite gets into the 

 eye, but probably through smaller worms which develop in the 



