Correction of long-sightedness, illustration. Cross-section diagram of an eye with the vision defect of long-sightedness (top), corrected with a convex lens (bottom). In long-sightedness, or hyperopia, the eyeball is shorter than it should be, or the eye's lens (grey) is the wrong shape, and light is focussed behind the retina. This causes difficulty focussing on a near object, which appears blurred. It can be corrected by placing a convex lens (blue) in front of the eye, which refracts light from the object so that it focusses on the retina, creating a sharp image.
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TOP26152714
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達志影像
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RM
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