Q: At what refresh rate are our eyes no longer able to detect the refresh? If you had to put a value on the refresh rate of actual reality what would it be? ...I know its comparing apples and oranges, but its a hypothetical, fun question. Comments?
A: Well, it's impossible to give a single figure, because it varies from person to person. Some people are more sensitive to this than others, and the ability to perceive it decreases as you get older. The range, in a person with normal eyesight, is probably somewhere between 100Hz and 500Hz.