II Dec. 1911.] 



Kve Complaints in Horses. 



843 



As previously mentioned, the foal is the progeny of No. 2 case, which 

 is suffering from cataract. Whether this is merely a coincidence or not, 

 I am not at present able to state. Further observations and investigation 

 may possiblv throw some light on the matter. The sire of this foal had 

 no defect in the eves. 



FIG. I.— VERTICAL SECTION OV THE 

 EVE FROM FRONT TO BACK, SHOW- 

 ING NORMAL LENS AND OTHER 

 STRUCTURES. 

 a. Front of eye — cornea — clear and 

 transparent, b. Front chamber, c. Iris 

 or inside curtain. d. Pupil or open 

 space in centre of iris. e. Lens, 

 normally transparent. /. Main cavity 

 g. Retina or back curtain. h. Optic 

 nerve, i. White coat. j. Middle coat. 

 k. Evelids. 



FIG. 2.- -VERTICAL SECTION OF EVE 

 FROM FRONT TO BACK. SHOWING 

 LENS AFFECTED WITH CATARACT. 



c . 

 blac 



Fi-r. 



Lens affected with cataract, marked 

 k. Other strurtiir:-> nnrni:il ns in 



With regard to the other cases, all of which are "cataract," there 

 are several interesting features. Cataract itself is a diseased change in 

 the lens of the eye which diminishes its transparency, that is to sav, the 

 lens, instead of remaining, as it should, perfectly clear and transparent, 

 becomes more or less whitish or opaque. 



X 



— I 



FIG. -|. 1 RONT VIEW OF EVE IN 

 FOAL. CASE NO. I . 

 a. C'ornea. /. So-called '" white of 

 the eye." k. l-'.yelids, forced apart to 

 e.\()ose front of eyeball. 



FIG. 3. VERTICAL SECTION OF EVE 

 IN FOAL. CASE NO. I. 

 a. Cornea, corresjiondinj;; to Fig. la, 

 ()| .ii(iK', ilark coloured, shrunken and 

 [>r(jtrudin«,'. /. So-calle.l " while of 



the eye" prominent, red and fleshy. 

 k. F.yelids. 



This loiidilioii partially or conipirlcly prevents the rays of light passing 

 into the rye In-yond the lens (compart- the horizontal lines passing into 

 the eye in Figs' i and 2). The general effect of cataract is partial or 

 <Miiiplete blindness, according to its extent. 



