Editing Eye tracking (section)

{{Short description|Measuring the point of gaze or motion of an eye relative to the head}}
{{About|the study of eye movement|the tendency to visually track potential prey|eye-stalking}}
{{Use dmy dates|date=August 2020}}
[[File:Eyetracker1.jpg|thumb|Eye tracking device]]
[[File:Exploring-Eye-Movements-in-Patients-with-Glaucoma-When-Viewing-a-Driving-Scene-pone.0009710.s001.ogv|thumb|right|Scientists track eye movements in [[glaucoma]] patients to check vision impairment while driving.]]
'''Eye tracking''' is the process of measuring either the point of [[gaze (physiology)|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 and [[Eye movement (sensory)|eye movement]].  Eye trackers are used in research on the [[visual system]], in psychology, in [[psycholinguistics]], marketing, as an input device for [[human-computer interaction]], and in product design. In addition, eye trackers are increasingly being used for [[assistive technology|assistive]] and rehabilitative applications such as controlling wheelchairs, robotic arms, and prostheses. Recently, eye tracking has been examined as a tool for the [[Karen Pierce (scientist)|early detection of autism spectrum disorder]]. There are several methods for measuring eye movement, with the most popular variant using video images to extract eye position.  Other methods use [[search coil]]s or are based on the [[electrooculography|electrooculogram]].