292 DISEASES OF HORSES AND CATTLE. 



of the eyesight. When the attack comes on, keep 

 the animal in a moderately dark place and bathe 

 the eyes with cold water for ten or fifteen minutes, 

 and use acetate of lead, ten grains; tincture of 

 opium, ten drops; water, one and a half ounces, to 

 be applied after each bathing; this should be done 

 three times a day, and give one dram iodide of 

 potassium twice a day for four days in bran mash. 

 If this is well done I find that the eye will be left 

 as clear as before the attack, but it will not prevent 

 it from returning; but if we can by this treatment 

 prevent the animal from becoming blind we are 

 accomplishing a great deal. I have tried arsenic 

 and quinine as a preventive, but have not suc- 

 ceeded. 



Glaucoma. — This is a disease of the vitreous hu- 

 mor, destroying its transparency and causing it to 

 become of a blue color, and is often the result of 

 ophthalmia cataract and amaurosis, and very often 

 becomes calcareous instead of remaining in a fluid 

 form. It sometimes appears in old animals with- 

 out any previous inflammation. It is incurable 

 and treatment would be of no use. 



Amaurosis, or Glass Eye. — This is a diseased 

 condition of the optic nerve, causing loss of power 

 to receive or transmit impressions of objects to the 

 great nerve centers of the brain. 



( auses: Sudden shock by loss of blood, or I have 

 seen it from an animal striking its head, or in fall- 

 ing backwards and its head coming in violent con- 

 tact with the ground. It has been caused by too 

 heavy pulling, or by being driven to exhaustion. 



