SCROLLABLE KEYBOARDS FOR CASUAL EYE TYPING
Oleg Špakov, Päivi Majaranta · 2009
In eye typing, a full on-screen keyboard often takes a lot of space because the inaccuracy in eye tracking requires big keys. We propose “scrollable keyboards ” where one or more rows are hidden to save space. Results from an experiment with 8 expert participants show that the typing speed reduced by 51.4 % for a 1-row keyboard and 25.3 % for a 2-row keyboard compared to a full (3-row) QWERTY. By optimizing the keyboard layout according to letterto-letter probabilities we were able to reduce the scroll button usage, which further increased the typing speed from 7.26 wpm (QWERTY) to 8.86 wpm (optimized layout) on the 1-row keyboard, and from 11.17 wpm to 12.18 wpm on the 2-row keyboard, respectively.