Robust High-speed Binocular 3D Eye Movement Tracking System Using a Two-radii Eye Model

Existing video-based eye movement tracking systems measure three-dimensional eye orientations by assuming the eye is a sphere that rotates around its center at a fixed radius. We found this model inaccurate. We have developed a system that uses a two-radii eye model, which assumes that the eye rotates around two different centers with different radii horizontally and vertically. We found this two-radii model more accurate in estimating the three-dimensional eye positions than the traditional one-radius eye model