How many frames per second can your eyes see?

To avoid confusion, keep in mind that eyes are not able to see, meaning that the number of frames an eye can capture per second usually differes from the number of frames the brain can process.

The human brain processes about 20 frames per second, but can go as high as 60 when in panic.

This is purely made for survival purposes, and can only be achieved by reducing other important brain activity (which you would need for rational thinking, emotions or social interaction, for example).

This also explains why, when you are in panic, you perceive everything as being in a sort of slow motion, compared to how fast you would normally perceive things. This is so that your brain can know and decide where to go next in a dangerous situation (as falling to ground, or being chased by a wild animal).

However, the human eye is able to capture much more frames per second, even higher than 200 fps in some cases. This varies a lot from person to person, and it does not change the fact that your brain processes 20 fps. Since the human eye perceives information continuously, at a rate much higher than the brain can process, you would not be able to see at 200 fps.

Under ideal conditions you would even be capable of processing the afterimage of a single frame that had been shown for 5 milliseconds (wich corresponds to 200 fps) or less.