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The Eye Tracker features two 60Hz infrared (IR) cameras with IR illuminators. It comes as a full insert which attaches magnetically underneath the facial gasket and connects to the primary USB-C port on the side. HTC claims it’s accurate to within 0.5°~1.1° after the 9 point calibration process. As well as tracking where you’re currently looking, it also tracks pupil size and eye openness, enabling blink and wink detection.