The advantages of wearing natural crystal: First, the transparency of the crystal glasses is high, and the observation of things is clearly visible, especially the crystal reading glasses. The clarity of reading is far higher than the clarity of the glass reading glasses, which is related to the composition and internal structure of the two. Second, the crystal glasses wear a cool feeling, refreshing and refreshing, even in the hot summer eyes will not feel dry and tired, the mind is clear and spirited.
This is because the thermal conductivity of the crystal is relatively good, its thermal conductivity is 140-264, which is 10-20 times of the thermal conductivity of the glass (12-33). It has higher thermal conductivity than plastic and resin materials, so wear ordinary glass lens sunglasses. In particular, wearing plastic lens sunglasses will cause eye headaches, which are related to their low thermal conductivity and poor transparency. Third, the crystal lens has high hardness (Moss 7), and it is not easy to fluff for long-term use. The lens always keeps smooth and bright. High transparency, while glass and plastic resins are much lower in hardness than crystals, so they are easy to fluff and blur, and long-term use can easily affect the eye's vision.
Faced with a dazzling array of crystal glasses, consumers should polish their glasses and give themselves a clear world. Consumers should pay attention to the problems when purchasing crystal glasses:
First of all, during the formation of natural crystals, impurities are generally formed inside, commonly known as "mian", which is spotted or flocculated by sunlight and the two lenses are symmetrical to each other; while artificial crystals are artificially added on the surface and the ends are neat. Single location.
Secondly, the natural crystal color is naturally soft and does not change color; while the artificial color is artificially colored, it will fade significantly over time.
Third, natural crystals are denser than artificial crystals, and the same pair of glasses are more serious.
Fourth, the natural crystal feels cold with the lips, but the artificial one does not have this feature. Authenticity glasses are not easy to wet, and it is not easy to absorb fog.
Fifth, the natural crystal is hard, and the mirror is lightly cut with a piece of glass. The genuine product leaves no traces, and the fake will have scratches.
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