This video is showing a Gaze Replay, recorded at 300Hz using the Tobii TX300 eye tracker, of a participant in a reading study. 

The Tobii TX300 Eye Tracker sets a new standard for remote eye trackers. Its unique combination of 300 Hz sampling rate, very high precision and accuracy, robust tracking and compensation for large head movements extends the possibilities for unobtrusive research of oculomotor functions and human behavior.