The lens is not doing the eye problem. I posted what my guess was - refraction on the eye cover and not enough bounces.

If you want more than a guess, show me eye material settings, particularly the cornea. Because of the viewing angle and the size of the image, I can't really make out well if the eye white is messed up or just the iris, or just whatever is under the cornea, or is it involving the whole eye cover. (There are multiple eye parts that can be set up for refraction or transparency, and possibly incorrectly.) 

Then I may have other questions.

Also, how does it look without using the lens?

Also, how does it look with shadows disabled in render settings?

I may have other questions later about render settings, but first we need to figure out which ones matter. That means knowing what the shaders are doing.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)