Towards eye based virtual environment interaction for users with high-level motor disabilities

An experiment is reported that extends earlier work on the enhancement of eye pointing in 2D environments, through the addition of a zoom facility, to its use in virtual 3D environments using a similar enhancement. A comparison between hand pointing and eye pointing without any enhancement shows a performance advantage for hand based pointing. However, the addition of a ‘fly’ or ‘zoom’ enhancement increases both eye and hand based performance, and reduces greatly the difference between these devices. Initial attempts at ‘intelligent’ fly mechanisms and further enhancements are evaluated.