After Google experimented with integrating a glucose level sensor on a contact lens, it was only a matter of time before we would see more innovation in this field. A recent patent filing from Sony describes the intention of putting a camera inside a contact lens.
While this toy won’t exactly be invisible –at least not at first – the privacy implications are quite serious. We’re still at least a few years away from market availability, but I imagine that after several product cycles, such a camera could reach a pretty good recording resolution. Coupled with wireless transmission to a storage device, people will eventually be able to record everything they see, everywhere they go.