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”?
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Other folks have already made the point that FPS isn’t a meaningful concept for human vision. That’s true, but there is another way to think about it. We have something called “persistence of vision”; our brains hold onto a visual stimulus for a short period of time and uses that stored image to make smooth transitions when our eyes move or change focus. We can measure that latency and use it in building displays. In fact, TV and movies only work because of this effect. If you view a video at fewer than 24 FPS, it will look like a series of stills. At frame rates higher than 24 FPS, the images blur together and produce an illusion of smooth motion. Higher frame rates can be more convincing, but 24 per second is the minimum. Taken all together, human vision isn’t a series of stills, but there is enough lag in the system that a frame rate higher than 24 FPS looks like smooth motion and 24 FPS might arguably be seen as an analogous measure of human vision
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