I love the eyes of herps. Post what you think is the coolest eye of any herp you've found here. I'll start... My favorite would have to be the plains spadefoot toad (Spea bombifrons). I absolutely love the contrast between the body and they eye.
OK, not a herp, but cold blooded, and has scales... sort of. The eye of a Big Skate, commonly caught while fishing for halibut in Prince William Sound. Very neat eye, though!
I think that the Tokay gecko takes it for me so far.