Current eye-tracking input systems for people with ALS or other motor impairments are expensive, not robust under sunlight, and require frequent re-calibration and substantial, relatively immobile setups. Eye-gaze transfer (e-tran) boards, a low-tech alternative, are challenging to master and offer slow communication rates. https://www.indjcst.com/archives/paper-details?paperid=69&papertitle=low-cost-eye-gesture-communication-system-for-people-with-motor-disabilities