Recent high school grad Luis Cruz, 18, started out tinkering with video game technology, and says he designed the Eyeboard to help people communicate using eye movements. It is based on electrooculography, which takes advantage of the eyes' electrical potential. The eye acts as a dipole, with the cornea positively charged and the retina negatively charged. As a person's eye moves, the negative pole moves relative to the person's face. Attaching two electrodes to a person's head near his or her eyes can capture this change. Cruz integrated the electrodes into a pair of glasses and connected it to an amplifier. It's based on an ATmega328P microcontroller and runs on software Cruz wrote himself.