We explore how gaze can support touch interaction on tablets. When holding the device, the free thumb is normally limited in reach, but can provide an opportunity for indirect touch input. Here we propose gaze and touch input, where touches redirect to the gaze target. This provides whole-screen reachability while only using a single hand for both holding and input. We present a user study comparing this technique to direct-touch, showing that users are slightly slower but can utilise one-handed use with less physical effort. To enable interaction with small targets, we introduce CursorShift, a method that uses gaze to provide users temporal control over cursors during direct-touch interactions. Taken together, users can employ three techniques on tablets: direct-touch, gaze and touch, and cursor input. In three applications, we explore how these techniques can coexist in the same UI and demonstrate how tablet tasks can be performed with thumb-only input of the holding hand, and with it describe novel interaction techniques for gaze based tablet interaction.
['Ken Pfeuffer', 'Hans Gellersen']
Gaze and Touch Interaction on Tablets