Metodología de Evaluación de Eye-trackers como Dispositivos de Acceso Alternativo para Personas con Parálisis Cerebral

The procedures for evaluating alternative computer access systems are neither rigorous, systematic nor formal. We present a methodology to evaluate the user-computer interaction, based on three metrics, when people with cerebral palsy (CP) use eye- trackers as an alternative access device. We validated the methodology by comparing three commercial eye-trackers with nine participants seriously affected by CP. The results indicate that the calibration is a very critical process in these scenarios because of the high rate of calibration failures measured. The participants with CP also have a high click error rate, indicating that using eye- trackers to reach an object on the screen is a complex process for these levels of disability. The click times are similar between all eye-trackers and participants. This study is not intended to discourage the use of eye-trackers in the population with CP, but to establish methodological guidelines for the effective evaluation of commercial devices, which can be an interesting alternative to computer access for this population.