Eye-tracking is a innovative method that allows you to track users' eye movements.
HD Camera is watching tester while performing test and by face-tracking algorythms our software can detect position of eyes.
The whole precess begins with calibration, where our system is learning how tester's eyes look like while watching certain parts of the screen.
After successful calibration we start measuring eye position while displaying stimuli (your project).
You can read more about eye-tracking here