Flicker
*Critical threshold of flicker rates is about 60 Hz in the fovea
*But gets higher for larger stimuli
*Recommended flicker rates between 66 Hz and 120 Hz (Bridgeman, 1998)
*Most monitors are adequate in this value
*Notice difference between flicker and frame update rate.
*Wagon wheel effect.
Most artificial light sources flicker.  That is they turn on and off repeatedly.
The threshold is usually given as 60 Hz.
But that is a general value.  It depends upon many factors  such as brightness and size.
So as brightness and size of monitors increased.   There is a need to increase the frame rate.  That is happening on many displays today but not all.
Bridgeman, B. (1998).  Durations of stimuli displayed on video display terminals: (n-1)/f+persitence.  Psychological Science, 9, 232-233.