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More specifically it's the bright light triggering the iris to close that improves the focus. As the aperture narrows (iris closes) the incoming rays become mor
by hetman 8y ago
More specifically it's the bright light triggering the iris to close that improves the focus. As the aperture narrows (iris closes) the incoming rays become more collimated (less scattered) and so the image falling on your cornea appears sharper even if your eye's lens is not able to focus it correctly. At it's extreme this effect allows the pinhole camera to work without using any lenses at all to focus the image.
The thing is though, while using lower powered glasses might help you train the muscles around your eyes' lenses to be stronger, mitigating the myopia slightly, the root problem still remains: your eyeball is the wrong shape and there's only so much your eyes' lenses can do to make up for that.
- dingleberry 8y agonot really... seeing things under sun is not equal to squirting ur eyes to focus the incoming rays it's just that much light coming, the intensity of light to be exact. that's why camera, given the same setup, gives sharper image under bright sun light I never get as tired playing outside as compared to squirting my eyes all the time just to focus in a room. sun light is just that intense, rooms lightings are much less intense.
- hetman 8y agoCameras only give a sharper picture in bright light because this allows you to reduce the aperture size. The image is not sharper if you increase the shutter speed instead of reducing the aperture. This is basic physics. Bright light is not magical. Squinting your eyes is a very poor approximation to what your irises are doing. The light collimation is not reduced uniformly in every axis and your eyelashes partially obscure the light.