DISEASES OF THE EYE AND ITS APPENDAGES. 359 



within a week or ten days, the eye becomes clearer, regains its trans- 

 parency, until it eventually is fully restored. In unfavorable cases 

 blood vessels form and are seen to traverse the affected part from periph- 

 ery to center, vision becomes entirely lost, and permanent opacity 

 (albugo or leucoma) remains. When it arises from constitutional causes 

 recurrence is frequent, leaving the corneal membrane more cloudy after 

 each attack, until the sight is permanently lost. 



Suppurativc keratitis maybe a sequel of diffuse keratitisj more com- 

 monly, however, it abruptly becomes manifest by a raised swelling on 

 or near the center of the cornea that very soon assumes a yellow tur- 

 bid color, while the periphery of the swelling fades into an opaque ring. 

 Suppurative keratitis is seldom noticed for the first day or two not 

 until distinct pus formation has occurred. When it is the result of dif- 

 fuse keratitis, ulceration and the escape of the contained pus is inevita- 

 ble; otherwise the pus may be absorbed. When the deeper membranes 

 covering the anterior chamber of the eye become involved the contents 

 of this chamber may be evacuated and the sight permanently lost. 



Treatment. Place the animal in a darkened stable, give green or 

 sloppy food, and administer 4 ounces of Glauber's salt sulphate of 

 soda dissolved in a quart of water once a day. If the animal is de- 

 bilitated a tablespoonful of tonic powder should be mixed with the feed 

 three times a day. This may be composed of equal parts by weight of 

 powdered copperas (sulphate of iron), gentian, and ginger. As an 

 application for the eye nitrate of silver, 3 grains to the ounce of 

 soft water, with the addition of 1 grain sulphate of morphia, may be 

 used several times a day. If ulceratiou occurs a solution of blue vit- 

 riol (sulphate of copper) or nitrate of silver, 5 grains to the ounce of 

 water, should be used. (See Ulcer of Cornea.) 



To remove opacity, after the inflammation has subsided, apply a few 

 drops of the following solution twice a day: Iodide of potassium, 1"> 

 grains; tincture sauguinaria, 20 drops; distilled water, li ounces; mix. 



ULCERS OF THE CORNEA. 



All ulcer is the common consequence of the bursting of a small ab- 

 scess, which not unfrcquently forms beneath the delicate layer of the 

 conjunctiva, continued over the cornea; or, in the very substance of 

 the cornea itself, after violent keratitis, or catarrhal conjunctivitis. At 

 other times the ulcer is produced by bruises, scratches, and other direct 

 injury of the cornea. 



NywptmR. The ulcer is generally nt first of n pale gray color, with 

 its edges high and irregular, and discharges instead of pus an acrid 

 watery substance, with u tendency to spread widely and deeply. If it 

 spreads superficially upon the cornea, the transparency of this mem. 

 brane is lost; if it proceed)* deeply and penetrates the anterior cham- 

 ber of the aqueous humor, this fluid escapes, the iris may prolapse, and 



