Jean Lorenceau of France’s CNRS research institute has built a prototype device that enables people to write or draw on a computer screen using only their eyes. Cameras mounted on headgear track eye movements and translate them into lines on the computer screen. Eye tracking technology has been around for awhile, but Lorenceau’s system offers more precision for writting letters since it compensates for jumpy eye movements. After four half-hour training sessions, his subjects were able to write at a rate of about 25 letters per minute.