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Various interfaces for gaze control (which are recommended due to certain requirements of controlling a machine by gaze) have already been developed. One problem, especially for novice users, is that respective interfaces all look different and require different steps to use. As a means to unify interfaces for gaze control, pie menus are suggested. Such pEYEs allow for universal input in various applications usable by novices and by experts. We present two examples for pEYE interfaces; one eye-typing application and one desktop navigation. Observations in user studies indicate effective and efficient performance and a large acceptance.
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Huckauf et al. (2008) studied this question.