Non-intrusive Eye and Gaze Tracking for Natural Human Computer Interaction
Qiang Ji, Zhiwei Zhu · 2003
Gaze determines the user's current line of sight or point of fixation. The fixation point is defined as the intersection of the line of sight with the surface of the object being viewed (such as the screen). Gaze may be used to interpret the user's intention for non-command interactions and to enable (fixation dependent) accommodation and dynamic depth of focus. The potential benefits for incorporating eye movements into the interaction between humans and computers are numerous. For example, knowing the location of a user's gaze may help a computer to interpret a user's request and possibly enable a computer to ascertain some cognitive states of the user, such as confusion or fatigue.