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Infrared (IR) light source (orange) illuminates the Raspberry Pi camera: (a) schematic and (b) picture of the camera. The Rasberry Pi records it as a reflection on the HMD lenses (c), pink dot. The IR camera inside the HTC Vive Pro Eye captures the reflected rays by the Raspberry Pi camera as an artificial eye. (c) Recorded events: greed dot referring to pupil-on and red dot indicating pupil-shift events.
