Eye tracking can make your VR/AR experience more immersive. Ganzin’s Eye Tracking Module (Aurora) allows you to control devices and information with your eyes. Aurora can track eye movements with precision. It runs for 12 hours on battery. Since it is light-source agnostic, you can use Aurora indoors or outside.
This module is compact, so you can put it on the frame of most AR/VR headsets or smart glasses. More information is available here.