Eli5 why does pressing my palms against my eyes create a kaleidoscope effect?
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The way I was always taught was that by pressing on your eyes, you’re increasing the pressure on your retinas, and cutting off circulation to the nerves the same way as when your leg falls asleep… It’s the visual equivalent of that ‘pins and needles’ feeling.
The difference is that your retina is much more oxygen-hungry than a random leg nerve and you can cause permanent damage if you do it too much.
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