58 SOUNDNESS IN HORSES. 



should not present that peculiar wrinkled condition which 

 is symptomatic of periodic ophthalmia. I may mention 

 that, when an eye has suffered from an attack of this 

 not very common disease, it looks dim, weak, and smaller 

 than natural. A representation of a healthy eye is given 

 in Fig. 3. Both eyes should be of the same size. Any 

 excessive convexity or flatness of the cornea should be 

 noted, with the view of ascertaining how it may affect 



Fig. 3. 



the sight. We may try the sight of one eye by shading 

 the other, and by gently moving the fingers of the dis- 

 engaged hand close to the uncovered eye, taking care 

 not to touch the eyelashes, nor to produce a current of 

 air, which, by affecting the nerves of the part, might 

 make the animal blink, and might thus convey a wrong 

 impression to our mind. 



The eyes may now be examined by m.eans of a candle. 



