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Eye-tracking applications are used in large variety of fields of research: neuro-science, psychology, human-computer interfaces, marketing and advertising, and computer science. The commonly known techniques are: contact lens method (Robinson, 1963), electro-oculography (Kaufman et al., 1993), limbus tracking with photo-resistors (Reulen et al., 1988; Stark et al., 1962), corneal reflection (Eizenman et al., 1984; Morimoto et al., 2000) and Purkinje image tracking (Cornsweet & Crane, 1973; Crane & Steele, 1978).

The Perspective Geometry of the Eye: Toward Image-Based Eye-Tracking