424 DISEASES OF CATTLE, SHEEP, GOATS, ETC. 



is not advisable, for the sight can not be perfectly restored, and ob- 

 jects would be seen imperfectly without the aid of glasses. 



AMAUROSIS. 



A paralysis of the nerve of sight or the expansion of the retina. 



Causes. This is the result of concussion from a blow upon the 

 forehead, fracture of bone over the eye (causing downward pres- 

 sure), rheumatic inflammation of the optic nerve, or from extension 

 of deep inflammation of the eye involving the retina. It sometimes 

 occurs as the result of excessive loss of blood or of great debility. 



Symptoms. In this disease seldom any observation is made 

 until the animal in its gait and by its action indicates blindness. 

 Generally both eyes are affected. The eyeball remains clear, and 

 the pupil permanently dilated. No response to light is manifested. 



Treatment. If due to debility, loss of blood, or associated with 

 rheumatism, general blood tonics may be given in the feed, namely, 

 powdered sulphate of iron, 1 dram, gentian, 2 drams; nux vomica, 

 one-half dram ; to be given twice a day. In cases of rheumatism, 

 one-half ounce of saltpeter may be added. 



FILARIA OCULI (WORM IN THE EYE). 



Filaria oculi (provisionally taken as the larva of F. cermna). 

 This is a small white worm, and is found in the eye, swimming in 

 the aqueous fluid in the anterior chamber. It may be apparently 

 harmless for a long time, but will eventually induce keratitis with 

 inflammatory exudations. 



Treatment. The cornea may be punctured at its upper and 

 outer margin, and the worm squeezed out with the aqueous humor. 

 The latter will be formed again. This operation will result disas- 

 trously unless the greatest care and skill are employed. 



TUMORS OF THE EYELIDS. 



Occasionally tumors form upon or within the substance of the 

 eyelid. These may be of a fibroid nature, and arise from the fol- 

 licles of the hair as sebaceous tumors, or may be in the form of an 

 abscess. In debilitating diseases the lids sometimes become swollen 

 and puffy, a condition which might possibly be taken for the growth 

 of a tumor. This generally disappears with the improvement of the 

 health of the animal. Warts not uncommonly appear on or about 

 the eyelids of cattle. 



Treatment. The removal of a tumor in the vicinity of so deli- 

 cate an organ as the eye should not be attempted by anyone not 

 qualified for the operation. 



LACERATION OF THE EYELID. 



This accident is not uncommon where cattle are fenced in by 

 barbed wire ; an animal may be caught under the eyelid by the horn 

 of another; it may occur in the stable by means of a projecting nail 

 or splinter of wood. 



Treatment. The edges of the wound should be brought to- 

 gether closely and correctly, by means of pins pushed through very 

 nearly the whole thickness of the lid, extending through each lip of 

 the torn part ; then a waxed silk or linen thread must be wound over 

 each end of the pin, crossing the torn line in the form of the figure 



