Vision disorders corrected with lenses, computer illustration. In short sightedness (top left) light is focused in front of the retina. It can be corrected with a concave lens (right). In long sightedness (middle left) the focal point is behind the retina. It can be corrected with a convex lens (right). In astigmatism (bottom left) light is not focused evenly on the retina. Astigmatism can also be corrected with a lens (right).

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TOP26515170

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達志影像

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RM

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