Eye tracking is the process of measuring either the point of gaze (where one is looking) or the motion of an eye relative to the head. An eye tracker is a device for measuring eye positions, eye movements and pupil dilation. Eye tracking is used in many fields such as Psychology, Gaming, Cognitive Psychology, Human Factors, Neuropsychology, Psychiatry, Sport Sciences, Clinical Psychology, Usability, Ergonomics, Human Computer Interactions, Autism, Neurological Disorders, Neurosciences, Vision Re
In the 1950s Alfred L. Yarbus published important eye tracking research and his 1967 book is often quoted in the field. He showed the task given to a subject has a very large influence on their eye movements, meaning that the behaviour of an observer can be predicted through their eye movements. He also wrote about the relation between fixations and attention. During fixations, the brain is processing and taking information unless saccades event which are mainly used to search information.