The more interesting technology is contact lenses augmented with "mini LED screen" like in this article: http://spectrum.ieee.org/biomedical/bionics/augmented-realit...

This could actually be used to create a "bionic UI." Image Google Maps projected into your eye, as you walk around unfamiliar neighborhood. Hungry? With a blink of an eye you pull up Yelp reviews for nearby restaurants. Want your friends to see that tasty-looking dish? Double-blink and the picture is on facebook.