A Breadth-First Survey of Eye Tracking Applications 
Eye tracking applications are surveyed in a breadth-first manner, reporting on work from the following domains: Neuroscience, Psychology, Industrial Engineering and Human Factors, Marketing/Advertising, and Computer Science. Following a review of traditionally diagnostic uses, emphasis is placed on interactive applications, differentiating between selective and gaze-contingent approaches.
Duchowski, Andrew T. Lunds Universitet (2002). Articles>Software>Usability>Eye Tracking