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Lens surface shape should be the rule, there should not be such as spiral. Recognition approach is hands holding rack placed in front of the convex lens outward, moving slowly up and down, observe distant objects from the lens, if the majority of the object is stationary, but locally corrugated beating phenomenon, indicating the uneven surface of the lens, the presence.
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Some people like to wear crystal glasses to reveal the identity of the noble, in fact, the optical properties of far less quality crystal lens optical glass, advised consumers not to wear.
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