Engineers have built a device using mass-produced video gaming equipment that lets disabled people control a computer with just their eyes - with a price tag of under $30. The gadget comprises two video game console cameras, costing less than $10 apiece, attached outside the line of vision to a pair of ordinary glasses, reported the team from Imperial College London. The cameras relay the eye’s movements to an ordinary computer, wirelessly over Wi-Fi or via USB, and used one watt of power, the team wrote in the Journal of Neural Engineering. In this way, test subjects could control a cursor on a screen just like a computer mouse.