Availor, since the logo has to have eye, and simplification is not an issue, how about a photo of a real eye, plus special effects on the pupil? If you can get hold of a high definition pic, sizing it down should not be a problem. You don't have to vector it all the way. Just an idea.
A quick google image search produced a lot of eye-based logos.
http://images.google.com/images?q=ey...r=&sa=N&tab=wi
Look at them and find a style you like, then do your version. I'm not saying you should copy them, but think of it as strolling down a gallery looking for inspiration.