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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Many people have a football shaped lens or cornea. This is named “astigmatism”. Light focuses at different distances and becomes blurred. This may be in addition to lenses that are too strong or eyes that are too long or too short. By reducing the pupil size with squinting or making a small hole in your hand and looking through it, you use just the round center section. This also increases the focal distance such as looking in a pinhole camera. Every persons eyes are different and there are many combinations. Most eyes are similar left to right. But many are not.
My eyes are unusual. I have astigmatism in one eye in the lens. One eye has it in the cornea. it’s effect is the same. Most who have astigmatism have both of the long axes of the football shape parallel. Like || or =. I have this pattern /. Almost as if they are tilted. I have many other unusual features where I see the center of one eye like a donut hole and the donut ring of the other. I finally found an eye doctor that has the same condition who explained to me after 50 years the odd things I see that few get to experience. Src. my ophthalmologist.
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