AMAUROSIS. 347 



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 

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

 ( ne will contract. The influence the sound eye has on the blind 

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

 being u 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. 



