Chitons see with their shells!*

Sönke Johnsen/Duke University

*Or more importantly, they see with eyes that are embedded into their shells. The lens of the eye is even made from the same material (mineral) as the shell, aragonite.

In an analysis of the sight capability of these tiny eyes, researchers at MIT have recreated, by mounting a chiton eye lens to a microscopic objective and viewing objects underwater, the resolution at which chitons see!

Follow this link to see the entirety of the article and what resolution chitons see at.

Also, for further discussion, head on over to this Wikipedia article on Mollusk eyes and learn all about the phyla and how those type of animals see.