25 



may be relieved by using a 1 per cent, solution of corrosive 

 sublimate; this should be applied as previously directed, be- 

 ing very careful that the fluid does not come in contact with 

 other parts of the eye. As a rule, follicular conjunctivitis 

 occurs only in dogs. When it will not yield to medical 

 treatment, the inflamed follicular spots are clipped off; or 

 part or all of the haw may be removed. Nitrate of silver 

 solutions should be discarded in all cases where the cornea 

 is also involved, since it is liable to leave permanent 

 opacities of the cornea. 



DISEASES OF THE CORNEA. 



WOUNDS. 



The transparent cornea may be injured by a stroke of the 

 whip, by hard straw or hay stems, by thistles, and occasion- 

 ally by sharp objects — glass, nails, splinters, hedge thorns, 

 and wire barbs. Small rough or sharp objects that get into 

 the eye not only injure the conjunctiva but also may scratch 

 or even penetrate the cornea. In fact, many of the chemical 

 and physical causes of injuries to the conjunctiva in like 

 manner effect the cornea. 



The shunning of light by closing the eye and an extra 

 secretion of tears are always present during the active stages 

 of the inflammation. The seriousness or severity of an in- 

 jury depends upon the extent of surface affected and whether 

 the outer or middle layers are separately or conjointly in- 

 jured; or whether the entire thickness of the cornea is per- 

 forated. If there be but a small spot of the outer layer 

 injured, recovery takes place in a few days, by keeping the 

 eye covered with a clean cotton or linen cloth saturated in a 

 solution of 1 part carbolic acid to 100 parts of water. If the 

 deeper or middle layer of the cornea be injured, it will re- 

 quire more time for healing and is liable, in the horse, to 

 leave a scar — a whitish upaque spot. Treatment may con- 



