Yea that too.Eye tracking would be another one of those tech that (specially if the trend of monitor getting bigger for gamer continue and obviously already there for VR), there 1-2 degree of vision that need to be high resolution (and some margin of error around), specially if the system get 1000 fps fast to react quick enough to a fast eye change, we could be in 300 dpi on a very small portion of the screen and everything else in some old school 720p density and quality I would imagine, where our eye only see movement and bright change of light.
I believe the Varjo VR headset has a functional implementation of that already, with some caveats of course (did not personally test).
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