Modelling eye fatigue in gaze spelling task

The paper analyses the analytical models of fatigue and their applicability for using natural user interfaces (NUI). For evaluation of eye fatigue we use a gaze speller as an example of NUI system for text input with human gaze and eye tracking device. We use the system to evaluate the state and performance of the users in performing the text entry task as well as to analyse dynamical changes of the user's state (such as induced by fatigue) over time. The results suggest validity of classical model of muscle fatigue suggested by Banister et al. in the sports medicine domain.