DISEASES OF THE EYES. 243 



Treatment. — Separate the sound from the diseased, and from 

 the pastures or buildings where the malady has appeared. Give 

 the affected strong purgatives (salts) followed by diuretics 

 (nitre), place in a dark, quiet, dry building, and keep a cloth 

 over the eye saturated with a solution of a drachm each of 

 nitrate of silver and carbolic acid, and 10 grs. of morphia to a 

 quart of distilled water. Blisters may be applied to the cheeks 

 or behind the ears (Spanish flies 2 drs., lard f oz., for cattle; 

 twice the amount of lard for sheep ; rub well in). The result- 

 ing ulcers may be treated in the ordinary way. 



INTERNAL OPHTHALMIA. INFLAMMATION OF THE DEEP STRUC- 

 TURES OF THE EYEBALL. IRITIS. CHOROIDITIS. RETINITIS. 



Causes — Severe blows or other forms of local irritation ; 

 extremes of darkness and light ; exposure to a draught of cold 

 air, to a storm; various constitutional distuibances, especially 

 those of the digestive organs. 



Smyptoms. — Like those of supeificial ophthalmia, but with 

 more fever, constitutional disturbance, accelerated pulse, loss 

 of appetite, increased heat of body, and above all, with retrac- 

 tion of the eye into its socket, protrusion of the haw from its 

 inner angle over its surface, closure of the lids and contraction 

 of the pupil when brought into the light, and the presence of a 

 turbid liquid behind the transparent cornea, with white floating 

 flakes, and a yellowish or whitish deposit at the bottom of the 

 chamber. The brilliant reflection of the iris or curtain is also 

 largely impaired. As the disease advances a white speck of 

 cloud appears in the lens, behind the pupil and iris. 



Treatment. — Place in a dark building with pure, dry air, 

 purge (cow, salts ; horse, aloes ; dog, castor-oil), and follow up 

 with febrifuges (nitre, digitalis ; in dogs or pigs, tartar emetic) ; 

 apply alternately, by means of a rag over the eye, a lotion of 20 

 grs. acetate of lead, 20 drops extract of belladonna, and i quait 

 water, and one of 20 grains sulphate of zinc, 20 drops of 



