An Assessment of the Eye Tracking Signal Quality Captured in the HoloLens 2

We present an analysis of the eye tracking signal quality of the HoloLens 2s integrated eye tracker. Signal quality was measured from eye movement data captured during a random saccades task from a new eye movement dataset collected on 30 healthy adults. We characterize the eye tracking signal quality of the device in terms of spatial accuracy, spatial precision, temporal precision, linearity, and crosstalk. We are the first to measure linearity and crosstalk in the HoloLens 2. Most notably, our evaluation of spatial accuracy reveals that the eye movement data in our dataset appears to be largely uncalibrated, possibly due to the experimental conditions in which we collected our data. We also observe that recalibrating the data using our own recalibration task produces notably better eye tracking signal quality. From these findings, we discuss the possible causes of poor signal quality in our experimental setup and make recommendations for future researchers interested in using eye tracking in the HoloLens 2 for research.