Design recommendations of target size and tracking speed under circular and square trajectories for smooth pursuit with Euclidean algorithm in eye-control system

In this study, we investigated how the size, speed, and trajectory shape of smooth-pursuit targets for Euclid's algorithm affect the ergonomics and usability of the gaze interface, and conducted a user study with 20 participants, examining the priority of five target sizes in circular and square trajectories, and the recommended speed for each size in the five target speeds. The usability of the SUS and ISO 9241 (acceptability and comfort) of the eye control system had been evaluated. Based on the experiment results, the design recommendations of the priority of the target size and speed of the circular and square trajectories, suggested trajectory shapes. The research is an important reference for the design and development of smooth-pursuit targets based on the Euclidean algorithm.