How do contact lenses work? - All About Vision
Jan 11, 2019 · How contact lenses work to correct vision is the same way eyeglasses do: They alter the direction of light rays to focus light properly onto the retina. If you are nearsighted, light rays focus too early within your eye — they form a focus point in front of the retina instead of directly on it. Contact lenses and eyeglasses correct nearsightedness by diverging light rays, which reduces the ...
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