Wide-range high-precision eye-tracking based on Purkinje reflections

Humans continually move their eyes to explore the visual world. Precisely measuring eye movements is, therefore, crucial for both understanding human vision and paving the way for the next generation of augmented and virtual reality devices. Imaging Purkinje reflections enables high-resolution eye-tracking over a limited range. Here we present an optical architecture that enables extension of the tracking range while maintaining 1 arcmin resolution.