It tracks the position of the eyes and the movement for visual attention.
You get an understanding of what draws immediate attention with eye tracking, which elements are overlooked by user, in which order elements are observed, and how elements compare with one another.
Eye tracking (ET) is a technique which monitors and records eye movements by using infrared light (which is completely harmless) or integrated web camera to determine the pupil's position and gaze on the scree.
The eye movements are observed and the participants ' gaze patterns are registered. Eye trackers detect and record visual patterns to clarify the visual path as a response to a particular stimulus and thus obtain visual attention data.