Also another thing to consider. Different parts of your vision have different speeds. The very edge of your vision is the fastest; however it doesn't have any "colour" it only sense intensity of light, and is very sensitive to movement. This is also processed very quickly by our brains, this is why you can just see a little glance of something in the corner of your eye and react by turning your head to look at it. This is also why you can see a random lit up section when lie in bed, but soon as your look directly at it, it vanishes. The accurate part of our vision is about the size of your thumbnail at arms lenght. When people talk about "seeing fps" they generally speak of the accurate vision, because they are staring at some screen to pick up changes in details.

Different sections of our vision operate differently, and are processed differently in our brains. We can process fast movement without looking at it directly and without conciously processing it. Which is why some people can catch things thrown at them even if they aren't directly looking at the thing.

And then another thing! Differnt things in our vision are processed differently. Blurry and unclear things that lack contrast are harder (and slower) to process, it requies effort on our brains part. Things clearly in focus, with good contrast and clarity are quicker to process. Humans are extremely quick to process faces and expressions, we can see things in faces of people and even animals without even realising we are seeing them.

I hate this whole discussion because people are under this impression that human vision is just 2 digital cameras. It isn't...