50 



iris, with an extra flow o£ tears and opacities of the cornea 

 and aqueous humor; these conditions may subside in a short 

 time and leave a slight cloudiness of the cornea and aqueous 

 humor. In certain districts in India this parasite is very 

 frequently in the eye of the horse and if not removed the 

 eye goes blind. This worm has also been observed in the 

 eyes of cattle. The worm may be removed from the aqueous 

 chamber by cutting a small opening in the cornea at its up- 

 per border near the sclerotic margin ; then remove the worm 

 with small forceps. Before operating it is necessary to cast 

 the horse or ox; amiesthise it with chloroform or aether and 

 apply a ten per cent, solution of cocaine to the eye. After 

 operating keep the eye moist and cool by frequent or con- 

 stant cold water applications, and occasionally put into the 

 eye a few drops of a one per cent, solution of carbolic acid 

 or boracic acid, or a weak solution of corrosive sublimate. 



Filaria lachrymalis is a small, white, round worm one- 

 half to one inch long; it lives in the lachrymal ducts, under 

 the haw or eye washer and sometimes under the eyelids; it 

 causes inflammation of the conjunctiva and lachrymal ducts 

 and may close the tear ducts Remove the worms from the 

 tear ducts and the conjunctival surfaces by using small for- 

 ceps; then apply, two or three times per day, a few drops of 

 a corosive sublimate solution (1 part c. s. to 1000 parts of 

 pure water). 



As elsewhere mentioned, Willach has discovered in the 

 eye the young forms of various round and flat worms, and 

 he claims that these animal parasites play an important part 

 in producing periodic opthalmia. 



Since nearly all parasites gain admission into the system 

 by way of the alimentary canal, infection may be prevented 

 by observing a few precautions. Impure drinking water is 

 probably the most common carrier of the various animal 

 parasites. Hence always give animals water from deep wells 

 or pure springs, and never from ponds, rivers, or stagnant 



