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The speed your focus can move across a screen is far too fast for what I think you are saying to help in streaming graphical elements.

In open world games you get pop-up where things in the distance are not rendered in time, if you are saying that clearer, more realistic graphics would be possible if only a small section is rendered properly (ie the bit you look at... with outer areas using simpler models and textures) then yes that would be true.... but while eye tracking technology can easily figure out where you look on screen, the CPU/GPUs of today are nowhere near fast enough to stream new models and textures like that each time you move your focus.

The military tech you mentioned sounds more like a deliberate visual effect... the flight simulator will be rendering all of the screen as normal, then overlaying a blurring effect which follows your focus to make it seem more realistic. With surround screens it would be a cool thing to put into 3D video games, but would not release any graphical power (and I think would look really weird on any screen that didn't take up a big chunk of your field of vision)