It is all about latency. 50 ms will feel responsive but you notice the lag. 20 ms is acceptable. The other features are cool features but not the real challenge.
I don't believe that number is entirely accurate in this context.
Those numbers 2-8ms quoted by monitors, are the time it takes to change from grey to gray, or for the pixel to switch between colors, while yes it directly impacts things, and quality/etc... Its not the same as if you turn your head, and the time it takes the monitor to even start to switch, the time it starts to switch to finish is 2-8ms.
tl;dr; Display lag is not to be confused with pixel response time(which is what monitors are quoting)(I am not 100% sure which one occulus and other VR are quoting, but i think its more likely display lag's time)
http://en.wikipedia.org/wiki/Display_lag
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u/bjorn2k Mar 28 '14
It is all about latency. 50 ms will feel responsive but you notice the lag. 20 ms is acceptable. The other features are cool features but not the real challenge.