The problem with invisibility.

I'm pretty sure that if they could make a person invisible like they did in stories like "The Invisible Man" and "Hollow Man" that person would not be able to see.

If your body's cellular structure were modified so that light passed right through it I think that would make your eye's stop working because they wouldn't be able to detect the light that hit them in order to turn it into signals that your brain could turn into sight. The light would just pass right through your eyes. Also the light would not be properly focused because the light wouldn't be shaped by the lenses of your eye.

They would have to make some kind of forumula that left your eye's visible, which would be really creepy looking. just some eyeballs floating around with no body.