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Eye tracking is the process of measuring either the point of gaze (”where we are looking”) or the motion of an eye relative to the head. An eye tracker is a device for measuring eye positions and eye movements.
httpv://www.youtube.com/watch?v=VbWu7GC5w3k
The most widely used current designs are video-based eye trackers. A camera focuses on one or both eyes and records their movement as the viewer looks at some kind of stimulus. Most modern eye-trackers use contrast to locate the center of the pupil and use infrared and near-infrared non-collimated light to create a corneal reflection (CR).
Since 2005 Eye tracking is used in Communication systems for disabled allowing the user to speak, mail, surf the web and so with only the eyes as tool. Eye control works even when the user has involuntary movement as a result of CP or other disability, those who wear glasses or many other characteristics that limit the effectiveness of older eye control systems.
More Information: http://en.wikipedia.org/wiki/Eye_tracking
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