How does squinting help us see better?
In: Biology
Depends on who you choose to believe, it either changes the shape of your eyeball / eye lens very slightly, shifting how things get focused, or the reduction of the amount of light that enters your eye cuts down on how much *out of focus light* reaches your retina.
The latter part is hard to explain without drawing diagrams and explaining concepts like focal planes… (here is one example that shows how you get a fuzzier image with a larger pinhole/aperture [https://www.schoolphysics.co.uk/age11-14/Light/text/Pinhole_camera/index.html](https://www.schoolphysics.co.uk/age11-14/Light/text/Pinhole_camera/index.html), the illustration isn’t great but the idea is that with the bigger pinhole, you get multiple images of the object)
(You can duplicate the effect without squinting by making a tiny circle with your fingers and looking through it, the image will be dimmer but sharper. That’s because by decreasing the “aperture” you’re making sure only the light that is best focused by your lens is reaching your retina, the out-of-focus beams reflected off of whatever you’re looking at are mostly excluded.)
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