Sorry, one more thing. About those cave fish. You said they grew eyes back very quickly, proving that eyes can be evolved relatively fast. Actually those eyes evolved without reproduction, and within a matter of days.

Of course, the eyes were lost during 'evolution', which makes sense, because losing data somehow equates to gaining data.

Anyway, apparently what happened was that what starts the growth of the eye was corrupted, but by adding the lens from an eyed fish of the same species on the surface, the eye grew. Proving that the data for the eye wasn't completely lost, just whatever controls the growth.

These eyes didn't 'evolve' back into the picture, they were always there. But thanks to mutations (or mistakes as one might call them), the fish couldn't grow them.

http://www.sciencedaily.com/releases/2000/07/000728082041.htm