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Review: Tobii eyeX lets you control your PC with your eyes (2:13) More for you to like: Tobii's eyeX gaze tracker is something special: it moves your cursor to where your eyes are looking. But the performance of this 'eye mouse' varies from user to user. Review: Tobii eyeX lets you control your PC with your eyes (2:13) More like this.
A wide variety of disciplines use eye tracking techniques, including cognitive science, psychology (notably psycholinguistics, the visual world paradigm), human-computer interaction (HCI), marketing research and medical research (neurological diagnosis).