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Both concave and convex lenses are used in improving sight.

Concave lenses are used to treat myopia or nearsightedness (shortsightedness) because they change the light's focal point from "in front of the retina" to the proper location on the retina's surface.

Convex lenses are used to correct hyperopia or farsightedness (longsightedness) by moving the focal point outward, because in a farsighted person the image is being focused "behind the retina."

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