Sadly, this technology is years away from being usable in humans, and from what I recall of the German tests, they were only left in for a month at a time....

It is a cool concept, though. They've now come out with contacts with the camera powered by a solar cell in the lens, which would cut down on the bulk of glasses and a battery pack.

The detective in my story can't see normally, and has a facial recognition program built into the implant that assists him in recognizing people. (They actually developed one over a decade ago to assist people who have short-term memory problems....it scrolls the person's identity constantly across the field of vision so that the wearer can remember to whom they're speaking)