Scientists have developed technology to direct lasers onto your retina to create images which are overlaid over your usual field of view. These images could offer a more detailed view of what you're looking at, including schematics, instructions, diagnostics, etc. The technology requires the use of a high-tech monocle, is already being used in Honda dealerships, and 100 units have just been shipped to Iraq for use by U.S. special forces.
Future versions of the technology might create totally realistic images.
(Via LVX23)
