<http://www.theregister.co.uk/2018/01/16/human_limits_of_vr_and_ar/>: By some estimates, given a field of view of 180 degrees, around 74 gigabytes of visual data are available to us each second, but only around 125 megabytes are ultimately processed ... Much of the rest is chucked away before it even gets to the optic nerve. But trying to minimize the rendering workload by concentrating on the fovea (the most detail-sensitive part of the eye, the little spot where the image falls when you “look at” something) is not so simple, given the quirks of how our visual perception actually works. Computer graphics doyen Alvy Ray Smith is reputed to have said “reality is 80 million polygons per second”. I think we can achieve that now, but the pixel rate considered acceptable on a conventional monitor is peanuts compared to that required for VR.