I tie flies and work in a fly shop for a living and when i tie for the the shop box i tie to catch fishermen. That means the fly must have wings on it. Do fish know the difference don't know but the fishermen do.Point is I put eyes on my crank baits I even put them on a lot of my hair jigs and some crappie jigs, The reason is it give me more confidence in the bait and just looks more realistic to me. I have never caught a fish that did not have eyes so eyes make me feel like it is more of a realistic bait.