\n| \n Eye tracking technique<\/strong><\/p>\n<\/td>\n| \n Video-based pupil and corneal reflection eye tracking with dark and bright pupil illumination modes.<\/p>\n Dark pupil tracking is supported in all sample frequencies. Bright pupil tracking is supported at 60 and 120 Hz. <\/p>\n Two cameras capture stereo images of both eyes for robust accurate measurement of eye gaze and eye position in 3D space, as well as pupil diameter.<\/p>\n<\/td>\n<\/tr>\n | \n| \n Eye tracking mode<\/strong><\/p>\n<\/td>\n| \n N\/A (default)<\/p>\n<\/td>\n<\/tr>\n | \n| \n Sampling frequency<\/strong><\/p>\n<\/td>\n| \n 30 Hz, 60 Hz, 120 Hz, or 250 Hz
\n(max. frequency depends on hardware version)<\/p>\n<\/td>\n<\/tr>\n | \n| \n Precision<\/strong><\/p>\n<\/td>\n| \n 0.04\u00b0 RMS in optimal conditions (applying Savitzky-Golay filtering, settings listed in the test report) –
\n0.2\u00b0 RMS in optimal conditions (raw signal)<\/p>\n<\/td>\n<\/tr>\n | \n| \n Accuracy<\/strong><\/p>\n<\/td>\n| \n 0.3\u00b0 in optimal conditions<\/p>\n<\/td>\n<\/tr>\n | \n| \n Binocular eye tracking<\/strong><\/p>\n<\/td>\n| \n Yes<\/p>\n<\/td>\n<\/tr>\n | \n| \n Eye tracker latency<\/strong><\/p>\n<\/td>\n| \n Mean latency < 13 ms @ 250 Hz (SD < 1.2 ms)<\/p>\n<\/td>\n<\/tr>\n | \n| \n Blink recovery time<\/strong><\/p>\n<\/td>\n| \n 1 frame (immediate)<\/p>\n<\/td>\n<\/tr>\n | \n| \n Gaze recovery time<\/strong><\/p>\n<\/td>\n| \n 250 ms<\/p>\n<\/td>\n<\/tr>\n | \n| \n Data sample output<\/strong><\/p>\n<\/td>\n| \n Timestamp,
\nGaze origin,
\nGaze point,
\nPupil diameter<\/p>\n<\/td>\n<\/tr>\n | \n| \n Eye openness data stream<\/strong><\/p>\n<\/td>\n| \n Eye openness stream is available in eye tracker set to 120 Hz, 60 Hz, and 30 Hz sampling frequencies. Note that the eye openness signal is not available in 250 Hz due to the processing power limitation. Eye openness stream has the same frequency as the gaze stream and will have the same timestamps. Eye openness data is provided in millimeters for each eye individually. <\/p>\n<\/td>\n<\/tr>\n | \n| \n Eye image data stream<\/strong><\/p>\n<\/td>\n| \n Eye image data stream frequency is approximately 4 Hz (one image per eye).
\nZoomed-in eye images available in tracking mode.
\nFull-frame camera images are available in gaze recovery mode.<\/p>\n<\/td>\n<\/tr>\n | \n| \n TTL input stream<\/strong><\/p>\n<\/td>\n| \n Not available<\/p>\n<\/td>\n<\/tr>\n | \n| \n Tracker and client time synchronization<\/strong><\/p>\n<\/td>\n| \n Integrated between the eye tracker time domain and the client computer time domain.<\/p>\n<\/td>\n<\/tr>\n | \n| \n User calibration<\/strong><\/p>\n<\/td>\n| \n Binocular, Monocular<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div><\/div> | | | | | | | | | | | | | | | |