Quote:
Originally Posted by flowerhorn
By squinting our eyes, it artificially makes the pupils smaller. By making the pupils smaller, the depth of field is increased, meaning you get better focusing on a wider range of distance. It is based on the same principle of pinhole. The smaller the hole, the sharper the object while a bigger hole will give you a blurr object in a certain fixed distance.
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I have always wondered too, when I was younger I used to squint at school and the teachers didnt think anything of it but my mum took me to the optometrist and found I was very short sighted so I am glad that one of the things I have always wondered about is finally answered lol
