This article also says it has to do with changing the shape of your eye. I have also read this in many other articles after searching for a couple minutes.
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Originally Posted by http://www.ccmr.cornell.edu/education/ask/index.html?quid=781
So, that means that squinting works by two mechanisms - by both changing the shape of the eye and by letting in light that can be focused more precisely by the lens.
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