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We evaluated the data quality of SMI's tethered eye-tracking head-mounteddisplay based on the HTC Vive (ET-HMD) during a random saccade task. Wemeasured spatial accuracy, spatial precision, temporal precision, linearity,and crosstalk. We proposed the use of a non-parametric spatial precisionmeasure based on the median absolute deviation (MAD). Our linearity analysisconsidered both the slope and adjusted R-squared of a best-fitting line. Wewere the first to test for a quadratic component to crosstalk. We prepended acalibration task to the random saccade task and evaluated 2 methods to employthis user-supplied calibration. For this, we used a unique binning approach tochoose samples to be included in the recalibration analyses. We compared ourquality measures between the ET-HMD and our EyeLink 1000 (SR-Research, Ottawa,Ontario, CA). We found that the ET-HMD had significantly better spatialaccuracy and linearity fit than our EyeLink, but both devices had similarspatial precision and linearity slope. We also found that, while the EyeLinkhad no significant crosstalk, the ET-HMD generally exhibited quadraticcrosstalk. Fourier analysis revealed that the binocular signal was a low-passfiltered version of the monocular signal. Such filtering resulted in thebinocular signal being useless for the study of high-frequency components suchas saccade dynamics.

Evaluating the Data Quality of Eye Tracking Signals from a Virtual Reality System: Case Study using SMI's Eye-Tracking HTC Vive