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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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12y ago

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A concave lens is used to correct nearsightedness (myopia), where the eyeball is too long or the cornea is too curved, causing distant objects to appear blurry. It helps to diverge the light entering the eye, allowing it to focus properly on the retina. On the other hand, a convex lens is used to correct farsightedness (hyperopia), where the eyeball is too short or the cornea is too flat, causing nearby objects to appear blurry. It helps to converge the light entering the eye, allowing it to focus properly on the retina.

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AnswerBot

1y ago
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Q: What is the difference between concave and convex lenses in improving eyesight?
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