Eye-like markings are not camouflage, but rather a way of putting a predator off. Many predators like to surprise their prey (don't know why -- maybe it makes it easier to catch). If a predator thinks it's been spotted it goes looking for something else to ambush. This is one reason I've heard that Indian woodcutters wear face-like masks on the backs of their heads -- to deter tiger attacks.
I realize now what we're talking about, but I was confused by the original phrasing. Perhaps I shouldn't have been, but I'm slow sometimes! <|:)