From a previous ELI5, I know that squinting helps you see better because you flex your cornea which helps bend the light to get a better focal point, but shouldn’t squinting when you have your glasses on/contacts in cause an overcorrection as if you are wearing an overprescribed pair of glasses/contacts?
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You see better when you squint because you deform your eyes.
For People who are short sited, the sharpest picture of the outside world falls just in front of the retina, creating a blurred picture. When you squint, you squash your eyes and change the shape. If you are lucky you change the shape of your eye in a way that will focus the picture on your retina creating a sharper image.
You can’t change the size of your pupil (the black hole in the middle of the eye) with squinting. However there is a reflex where when you focus on something nearby your pupils get smaller, to help focus nearby which would be a similar idea to the camera obscura.
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