VISION 485 



eye of the squid. Here we find a lens with a humor-filled 

 cavity, retina, and other layers much as in man. In the 

 squid eye, however, the rods are on the side of the retina 

 nearest the lens and they are supplied with optic fibers 

 from the back of the eye. 



The eyes of the vertebrates are essentially alike in 

 structure. The principal differences are in the means 

 used to secure accommodation and range of vision. 



