Eli5 how eyes even work?

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Why is it that when I look at a ceiling fan with my eyes wide open I can sort of see each individual blade spinning and it seems slower than when I close my eyes nearly all the way, the blades seem to be going much faster and I can’t see the individual blades as well?

In: Biology
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If you try to follow the blade movement, you will be able to see the individual blades. If you zone out and don’t focus on the blades, it will become a blur. It’s not your eyes that is doing it — it’s your brain. The eyes are constantly transmitting the images to your brain, but it is up to your brain to interpret those images.