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Most people start to suffer from vision deterioration around age 40. The eye's crystalline lens changes shape depending on the distance of the object being viewed. This lens elasticity deteriorates with age (Presbiopia). First signs of Presbiopia are when reading, the page has been to held further and further away. Reading glasses may be needed for a sharp vision.

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行业/领域：眼镜
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Unit of lens refractive power, equal to the reciprocal of the lens focus length in meters.

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