OF VETERINARY MEDICINE. 257 



blood. The worm is I/q"^ ^^ch long and is as slender as 60 cotton 

 thread. Sometimes it lies quietly and sometimes it flashes about 

 in the humor. This movement stimulates the glands to secrete 

 more humor and the eye bulges out, causing great distress. 



Treatment. — In case of the horse, lay the animal on his back, 

 turn the head on the poll and fasten the upper eyelid back with 

 a few stitches. Do not use a speculum to hold the lids in place. 

 First apply a little cocaine ; some use chloroform, but I do not 

 think that this is necessary. With an ordinary scalpel cut into 

 the cornea on the upper side of the eye. Make an incision about 

 an eighth of an inch long and then press out the humor. The 

 parasite will usually come out with the humor, but if not, press 

 it out. You may have to take it out with a pair of forceps. 

 This operation is called the Sclero-corneal operation. The wound 

 will heal by ftlrst intention, the humor will be renewed and the 

 eye will be all right in a few days. Never make the incision on 

 the lower side of the eye, else the humor will run out as fast as 

 secreted and form a fistula. Before operating pass the blade of 

 the scalpel through a flame to insure that it is sterile. 



AMAUROSIS. 



This condition is paralysis of the optic nerve. It is some- 

 times called Gutta Serena or Glass Eye. The eye is insensible 

 and there is total blindness. It is common in people and horses 

 and rare in cattle and dogs. The causes of the affection con- 

 sist of tumors and other diseases of the brain implicating the 

 optic nerve. Injury to the nerve between the brain and the eye 

 and inflammation of the roots and also the endings of the nerve 

 or undue pressure upon the same from inflammatory effusion are 

 etiological factors. Optic palsy may also occur from an over- 

 loaded stomach, from a profuse hemorrhage, and even from pres- 

 sure of the gravid womb in gestation. 



Semeiology. — Wide dilatation of the pupis is a marked symp- 

 tom. The whole interior of the eyeball is exposed and the ex- 

 pansion remains the same in light and darkness. The horse does 

 not swerve when a feint to strike is made unless the hand causes 

 a current of air to come against the face. The ears are held 



