Tobii's eye-tracking tech is niche on PCs, but makes virtual reality feel like magic

When I got one of Tobii's eye-tracking devices a few years ago, I didn't know what to do with it. Tobii bills itself as "the world leader in eye tracking," and as far as I could tell the claim rang true. The device certainly worked, and I could see it being very useful for people who (for any number of reasons) can't use a keyboard and mouse. But Tobii clearly wanted to broaden its ambitions and turn eye-tracking into a more mass-market solution, not an alternate means of interfacing with PCs but a primary means. Ubisoft builds Tobii support into all its games, and I played Assassin's Creed: Rogue with Tobii's eye-tracker swinging the camera wherever I looked.