AMAUROSIS. 349 



dilated and immovable under the influence of light. The interior 

 of the eye looks bright, healthy, and somewhat clearer than natural 

 — in fact, it looks glassy ; hence its common name. 



The eyelids are opened wide; and when both eyes are affected, 

 the animal's action and appearance denote that he is blind. 



If only one eye be amaurotic, its pupil will contract when light 

 falls on the sound eye; but if the blind eye be alone subjected to 

 the influence of light, neither its own pupil nor that of the healthy 

 one will contract. The influence which the sound eye has on the 

 blind one, is owing to the distribution of the optic-nerve fibres ; 

 there being a nervous connection between the two eyes, as well as 

 between each eye and the opposite nerve root. That portion of the 

 nerve which proceeds from the blind eye to the brain, having lost 

 its function, is unable to influence the healthy eye. 



