Constructing a Low-Cost Mobile Eye Tracker

AAAAha I have found it. http://hcvl.hci.iastate.edu/cgi-bin/openEyeswiki/index.cgi?MobileEyeTrackerConstruction

I have a feeling that this is a Linux based project so it maybe pointless researching, but it has spured me on to keep looking for a cheap DIY solution.

Picture from : http://hcvl.hci.iastate.edu/cgi-bin/openEyeswiki/index.cgi?MobileEyeTrackerConstruction