Octopus and squids (Cephalopods) have eyes very similar to that of human, but with a far superior power of

sight! A cross-section of the octopus eye reveals a cornea, a lens, an iris and a retina. But it has two

extra features not possessed by human eye.

Octopus can distinguish polarized light. It does not have a blind spot as man does. The optic nerve

connecting the eye to the brain lies behind it eye.

Some of the Cephalopods have twice as many light sensitive cells as humans do. This enables them to see

very clearly even in the dark depths of the sea.