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2. Polychromatic SSVEP stimuli with subtle flickering adapted to brain-display interactions
3. https://en.wikipedia.org/wiki/Pupillary_distance
4. https://www.vrfocus.com/2018/03/lg-patent-eye-tracking-technology-for-lg-ultragear-vr/
5. https://economictimes.indiatimes.com/magazines/panache/acer-launches-windows-mixed-reality-vr-headset-ojo-500-at-rs-39999/articleshow/66808878.cms