[leecb]

>Apple will liberally use an already-known VR technique that involves using eye-tracking to render objects in the user's periphery at a lower fidelity than what the user is focusing on.

This seems to be describing foveated rendering, which is reducing the image quality in your peripheral vision, because you are less likely to notice it there. It requires tracking where the eye to so you know what part of the screen the eye is looking at.

The RTX 3090 is likely rendering the whole 8k screen at a consistent quality level, whereas foveated rendering would mean that only the part of the display that the eye is actually focused on would be rendered at full quality. If Apple could pull off the tracking well enough (accurately, with low latency), they could probably save a lot of GPU power by lowering render quality outside of what you're looking at.

https://en.wikipedia.org/wiki/Foveated_rendering