Abstract
This chapter reveals that for understanding the prospects and problems of text entry by gaze, it is instrumental to know how eye-tracking devices work and to understand their limitations. Text entry by gaze is intended for users with disabilities. There are also other gaze controlled applications intended for the same user group. In one sense, text entry by eye gaze is quite similar to any screen-based text entry technique, such as the on-screen keyboards used with tablet PCs. The interface is more or less the same, only the interaction technique for pointing and selecting changes. Instead of a stylus or other pointing device, eye gaze is used. The most common way to use gaze for text entry is direct pointing by looking at the desired letter. A typical setup has an on-screen keyboard with a static layout, an eye tracking device that tracks the user's gaze, and a computer that analyzes the user's gaze behavior.
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