How would you like a contact lens you could put in your eye and get a constant heads-up display? DARPA is working on just that project for soldiers, further blurring the line between videogames and real life.

And not in some far-off future. But in "three to five years." Here's the official word:

A limiting factor to untethered, augmented and/or mixed reality applications is the bulkiness, power consumption, cost, limited resolution and limited field of view of head-mounted displays. DARPA seeks to leap beyond incremental, evolutionary enhancement of head-mounted display technologies to a see-through contact lens on which images can be displayed. This information might be command-and-control information, not unlike information provided to players of first-person, shooter-type videogames or synthetic entities and effects in a live training environment.