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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Our eyes rely on refraction, an effect where light changes direction when it enters a material that slows it down. By shaping the material right, you can form a lens, which focuses the light down to a point.
Depending on what direction the light comes from, this focal point moves, and so you can produce an image. This is how our eyes work.
The trouble is, the lens has to be calibrated for the right distance. If the light’s source (where it is scattered from) is too near or far, that image will be blurry. To account for this, the lens in your eye can change shape, but there is a limit to how much it can change shape. Some people’s lenses cannot change shape enough to have distant objects in focus.
By adding another (appropriately-calibrated) lens, we increase the focus distance, and allow those people to see with clarity once again.
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