Correcting near-sighted vision: " People who can see nearby objects clearly, but who cannot bring distant objects into focus are near-sighted." This happen, because the lens gather the light rays to make an image in front of the retina. When the light rays hit the retina, they are already spread out. ''A concave lens is used to diverge the parallel rays slightly, so that the image forms farther back, on the retina." ( Near-sighted vision : eye has longer shape than a normal eye. )
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