Head movement assessment of cerebral palsy users with severe motor disorders when they control a computer thought eye movements

Eye tracking is currently a promising technology to access computers for people who suffer severe motor disorders, like cerebral palsy. However, there is a lack of usability assessment procedures and concrete value to describe the user’s motor capabilities in this specific scenario of computer control. This paper presents a methodology, based on two head movement assessment metrics and the ISO-9241, for the quantitative motor description of users with severe motor disorders, when they control the computer thought their eyes. Seven participants with CP and three people without motor disabilities were recruited for the evaluation of the proposed procedure. Results evidence for the first time how users with CP control their head while they access a computer with their eyes.