Issue is that you can look around with your eyes at any part of the display, so the whole display needs to be able to show very high PPI/PPD, if you look at it.

Issue is that you can look around with your eyes at any part of the display, so the whole display needs to be able to show very high PPI/PPD, if you look at it. They can save on compute by detecting where your eyes are looking and reducing render resolution on the edges of your eye's FOV though. https://en.wikipedia.org/wiki/Foveated_imaging https://en.wikipedia.org/wiki/Foveated_imaging