How do glasses correct your vision? I know it has something to do with the retina but what exactly does it do?
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When light is emitted (or reflected), it spreads out the further away it gets from its origin. Think a shotgun, scattering its shot in an expanding cone away from the barrel.
In order to focus the light into a single coherent image, your eye has a lens which redirects incoming light. When working properly, light from a single point on an object will be redirected to land on a single point on your retina, regardless of the angle it entered your eye. (In the shotgun example, this would be like all the shot being redirected in midair to to come back together).
However, if your eye isn’t working just right (irregularity of shape or not being able to flex the muscle to adjust the lens properly, etc.), the light won’t come together in exactly the right way. Light from a single point on an object will be spread out over a larger area on your retina, causing the image on your retina to be *out of focus* or blurry. Corrective lenses like glasses or contacts compensate for the for your eye’s shortcomings to bring the image into focus again.
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