How do you either keep them turned "upright" or detect rotation for updating the images? Contacts slide around in the eye a bit and their shape keeps them on the eye's lens pretty well, but there's no asymmetrical shape for keep the contact lens from rotating.
Funnily enough, I just picked up today my first ever daily disposable lenses for correcting astigmatism. These are the most comfortable lenses I've ever worn, including regular daily disposables.
Still, there is going to be a significant amount of shake and sway as you move your eyes around. I wonder if you could correct it in software by tracking the movement of the lens with respect to the eye.
