Why are Flies so Hard to Swat? + more videos |

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When we see the world, our eyes send around 60 images or flashes per second to the brain. Our brain then combines these images, helping us see like this.
The eyes of a fly send 250 flashes per second to their brain, meaning, it takes in 4 times more visual information. Hence, when its brain combines 250 images, one second feels much longer, making the fly see in slow motion and allowing it to react much quicker than us.
Now, when we move our hand to swat a sitting fly, our action seems like a super quick single action to us. However, owing to the fly's ability to see our action in slow motion, it gets enough time to fly away, even as we are just in the middle of the action.