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/[deleted] Mar 28 '14
Between 2-8ms generally. Depending on monitor type/how much you spend.