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Eye-tracking plays a crucial role in the development of virtual realitydevices, neuroscience research, and psychology. Despite its significance innumerous applications, achieving an accurate, robust, and fast eye-trackingsolution remains a considerable challenge for current state-of-the-art methods.While existing reflection-based techniques (e.g., "glint tracking") areconsidered the most accurate, their performance is limited by their reliance onsparse 3D surface data acquired solely from the cornea surface. In this paper,we rethink the way how specular reflections can be used for eye tracking: Wepropose a novel method for accurate and fast evaluation of the gaze directionthat exploits teachings from single-shot phase-measuring-deflectometry (PMD).In contrast to state-of-the-art reflection-based methods, our method acquiresdense 3D surface information of both cornea and sclera within only one singlecamera frame (single-shot). Improvements in acquired reflection surfacepoints("glints") of factors $>3300 \times$ are easily achievable. We show thefeasibility of our approach with experimentally evaluated gaze errors of only$\leq 0.25^\circ$ demonstrating a significant improvement over the currentstate-of-the-art.

Accurate Eye Tracking from Dense 3D Surface Reconstructions using Single-Shot Deflectometry