Eli5 why does pressing my palms against my eyes create a kaleidoscope effect?
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You are putting enough physical pressure on the nerves to trigger them. The amount of pressure isn’t consistent across your eye, so the signals they send are semi random flashes that change in response to where the pressure is concentrated in your eye.
Your eye really isn’t built for that though, the pressure can cause damage to the nerves and physical structure of your eye that isn’t always easily healed, so you really shouldn’t push on your eyes.
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