Normal Vision: When light rays enter the eye from a distant object, the rays are parallel. The lens ( convex ) can make the rays, which come from different directions to meet at the retina, then form a sharp image. The light rays from a close by object are separated and go in different directions when they enter the eye. So, then the muscles in the eye will make the lens to change shape, it makes the lens thicker. The result of this gives the light rays to form a clear image of the object.
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