Your eyes are in actuality very limited. You can see in high resolution for only about 2°-3° of your vision and you get this high def vision in only about 4 fps. Your brain then stitches these high resolution images together in an internal 3d model and predictively adds any movement to the model assumed or identified by its low res vision.

Biology is like a hack, like an commodore 64 demo program getting the absolute most out of limited hardware.

https://www.youtube.com/watch?v=yW5v93P-gBw

It is my prediction that photo realistic rendering will be possible soon with out large advancements in gpu's simply by tracking accurately and at high speed the focus of your vision and only rendering that portion in high quality.