After the nose-based interface previously described in this blog, here is a simpler controller: EyeDraw (by Anthony Hornof, director of the Cognitive Modeling and Eye Tracking Laboratory, and developed with Anna Cavender and Rob Hoselton):

EyeDraw is a research project at the University of Oregon that enables users to draw pictures solely with the use of their eyes. (...) An eye tracker is used to detect eye movements and that data is interpreted by the application in order to allow users to click on buttons, choose starting and ending points, and save and retrieve drawings. (...) EyeDraw is being designed for children and teenagers with severe mobility impairments. Although other software exists for them to type and read, a drawing program will be a novelty for these users.