Why does squinting make things clearer when you have bad vision?
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It’s the same principle as a pinhole camera. When you decrease the aperture size, the light has fewer angles that it can enter through, so you get a slightly clearer image than if your eyes are wide open.
The light which passes through the top of your eye generates an image. The light which passes through the bottom generates another image. The light which passes through the middle, yet another image. Every part of your pupil generates its own image. If all of these images are misaligned, then you get a blur. If they stack up neatly on top of eachother, you get a nice crisp (and bright) image.
If we reduce the number of images (by blocking part of the pupil), we can get a more crisp final product at the cost of making it dimmer.
If this is happening to you, it’s a very good idea to get your eye Dr to test you for astigmatism. Astigmatism is a condition where the cornea of the eye is shaped improperly. When you squint, you are only looking through the part of the cornea that is properly shaped.
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