Nice. I think the idea is that by tracking and moving with the eye, you don't need a high resolution display. You just focus the resolution you have at the center of the users field of vision where most of our visual acuity is located.

That would be foveated rendering. Google Research recently put out a blog post on a new foveation pipeline they're developing.

https://research.googleblog.com/2017/12/introducing-new-fove...