why does squinting help you see a little better when you don’t have your glasses on?
In: Biology
This is the exact same thing as the Aperture/F-stop on a 35 mm camera:
Small opening, clearer focus and large if not infinite depth of field.
Large opening creates difficult focus, and very narrow depth of field.
It’s all about the circles of confusion, or Bokeh.
Squinting makes your eyelid opening smaller than your iris opening, basically like stopping down on the camera: so the circles of light that pass through are smaller = better focus
Think of it like the image on camera film or your eye retina is made up of tiny building blocks of focused-light image. The smaller the opening that the light goes through, such as tiny pupil or squinted eyes, has to make the potential area and individual building block of the image smaller, making higher resolution, like smaller pixels, or more pixels per inch: clearer image.
Also like when making a pinhole camera out of a shoebox or oatmeal tube. The smaller the pinhole, the sharper the image. There’s not even any lens to focus. Changing only the opening size, changes the sharpness of the image. So again, squinting makes the opening smaller, that the light goes through to reach your eye, which makes the image sharper.
[Circles of confusion](https://www.masterclass.com/articles/a-basic-guide-to-circle-of-confusion-in-photography)
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