Why can’t we measure the amount of FPS or Hz our eyes run at? What is different from a display to our own “perception”?

Question

Why can’t we measure the amount of FPS or Hz our eyes run at? What is different from a display to our own “perception”?

In: 92

Answer 1

I’m out and away from my computer, but https://humanbenchmark.com/tests/reactiontime is reasonably good.