how does concave lens correct the defect of shorts sightedness
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It is not the lens we wear , it's the retina of our eye that get used to the surrounding by looking through the lens. And the retina get used through the lens and we can see without spectacle clearly
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Someone with short-sightedness can see near objects clearly, but cannot focus properly on distant objects. This is caused by the eyeball being elongated, so that the distance between the lens and the retina is too great. It can be corrected by placing a concave lens in front of the eye.
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