Puzzle for Aristotle Scholars

Aristotle scholars spend a lot of time debating what, exactly, Aristotle was talking about when he talked about the "eye-jelly" that is involved in visual perception. I propose that they spend some time figuring out what Aristotle is talking about in the following quotation from _de Anima_:

"While in respect of all the other senses we fall below many species of animals, in respect of touch we far excel all other species in exactness of discrimination. That is why man is the most intelligent of all animals."