clipped from: technology.newscientist.com 
Technology is being developed to allow people with severe motor disabilities to play 3D computer games like World of Warcraft using only their eyes.
Eye-gaze systems bounce infrared light from LEDs at the bottom of a computer monitor and track a person's eye movements using stereo infrared cameras. This setup can calculate where on a screen the user is looking with an accuracy of about 5 mm.
The following video demonstrates hands-free computer control using the NeoVisus gaze interaction interface.
