In this section we will describe how an eye tracker works.
Eye tracking has long been known and used as a method to study the visual attention of individuals. There are several different techniques to detect and track the movements of the eyes. However, when it comes to remote, non‐intrusive eye tracking the most commonly used technique is pupil centre corneal reflection (PCCR). The basic concept is to use a light source to illuminate the eye causing highly visible reflections, and a camera to capture an
Tobii eye trackers are an improved version
The image on the right shows how a screen based eye tracker works. The basic eye tracking components are the illuminators, cameras, and the processing unit containing the image detection, 3D eye model and gaze mapping algorithms.
The image on the right shows how a wearable eye tracker works. Just like the screen based counterparts, a wearable eye tracker also is constituted by the same basic eye tracking components: illuminators, cameras, and the processing unit containing the image detection, 3D eye model and gaze mapping algorithms.