why does squinting help you see a little better when you don’t have your glasses on?
In: Biology
When someone has poor vision and sees things blurry it is because their eyes either do not bend the light enough or bend it too much. This produces a blurry image because the focal point is supposed to be on the retina but is instead ahead or behind it.
When you squint you are actually doing two things. First you are causing your cornea to flex slightly which helps with the bending of light to a better focal point. Second you are creating a smaller aperture for light to pass through which creates less scattering and sharper edges. The down side to this is muscle strain (which is why we wear glasses cause you don’t want to squint forever) and also a dimmer image because less light is passing through the aperture.
Glasses/contacts compensate for the amount of light bending needed to make sure the focal point maintains on the retina. Btw, this is more of a lens physics question rather than biology but there’s a lot of overlap there so…
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