Why do “light beams” appear from light sources when you squint, especially in a dark environment?
In: Biology
When you squint, you’re pushing the “tears” on your eyeball together between your eyelids. This makes the liquid bunch up enough that it creates a “bump” of water that acts as a kind of lens between your eyelids that changes how the light enters your eyes. Your eyelashes being in the way of that light also causes different optical effects which is why the “beams” usually point up and down and not side to side.
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