272 THE STOCK owner's ADVISER. 



site to that of the candle, is seen reflected from the posterior sur- 

 face of the lense. When cataract is present the latter image, and 

 sometimes the second one also, is rendered indistinct and wholly 

 invisible. 



A good examination of the eye can be made where the disease 

 is well marked, but cannot be detected in the light; by bringing 

 the horse from the darkened stable to the open door, and trying 

 the head on a line Avith the rays of light without and above. A 

 proper light can be thrown on the eye in this way. The animal 

 may be brought to the stable door; place a l)lack hat over the 

 eyes for a few minutes, then move it suddenly, and observe the 

 effect of light on the pupilary opening of the eye. The opthal- 

 moscope is a good instrument for examining the eyes, but it re- 

 quires some practice to use it successfully. Generally the above 

 method is all required. No treatment; the disease is incurable 

 in the horse. 



AMAUROSIS. 



This condition consists of a partial or complete loss of vision, 

 as result of j)aralysis of the optic nerve and expansion of the 

 retina, without much change in the appearance of the e^^e. 

 Amaurosis as a disease of the optic nerve is incurable, hut the 

 condition often exists as a symptom of other diseases in the body. 

 It occurs in parturient apoplexy in cows and in the last stages of 

 other diseases. It may result from injury to the optic nerve, by 

 the animal receiving blows on the head. A horse remaining for 

 a long time in a dark place, as dark stables, coal pits, etc., may 

 be affected with this disease. Excessive hemorrhage has caused 

 sudden and permanent amaurosis. 



Symptoms. — The pupil is greatly dilated, loses its natural form 

 and becomes round. The eye is prominent, bright, and has a 

 peculiar glassy appearance. The eyelids are opened more than 

 natural, with a peculiar staring look. The gait, and movement 

 of the ears, are indicative of blindness. It generally affects both 

 eyes. I have never seen a case where but one eye was affected. 



