With Tracker, you can use the Dikablis Eye Tracking System to track movement of the eye's pupil to calculate the gaze vector.
The Dikablis Eye Tracking System is compatible with both T-Series and Bonita cameras. A minimum of two cameras are required for use with the system.
For more information, see:
Eye tracking is not available with the evaluation license, but is an optional add-on to the full version of the software and requires an additional license.