  An increasing number of consumer-oriented head-mounted displays (HMD) for
augmented and virtual reality (AR/VR) are capable of finger and hand tracking.
We report on the accuracy of off-the-shelf VR and AR HMDs when used for
touch-based tasks such as pointing or drawing. Specifically, we report on the
finger tracking accuracy of the VR head-mounted displays Oculus Quest, Vive Pro
and the Leap Motion controller, when attached to a VR HMD, as well as the
finger tracking accuracy of the AR head-mounted displays Microsoft HoloLens 2
and Magic Leap. We present the results of two experiments in which we compare
the accuracy for absolute and relative pointing tasks using both human
participants and a robot. The results suggest that HTC Vive has a lower spatial
accuracy than the Oculus Quest and Leap Motion and that the Microsoft HoloLens
2 provides higher spatial accuracy than Magic Leap One. These findings can
serve as decision support for researchers and practitioners in choosing which
systems to use in the future.
