According to international standards, allowing through glasses of UVA should be below 10% UVB and UVB should not be through, otherwise damage your eyes, but it can be crystal lens through ultraviolet UVA about a hundred ninety-thirds through ultraviolet UVB about 90 per cent, so if the advantage to compare with the purpose of raising the disadvantages of UV damage, it is not worth the candle, and ordinary optical lenses, high refraction Tiffany and Co Charm Bracelet Jewelry Outlet glass lenses, coated lenses and so on UV absorption and interception capabilities, comparatively speaking, the optical properties of crystal glasses is far better than ordinary optical glass, quartz crystal is a plus, and more with irregular internal impurities, between cotton flock corrugated, non-homogeneous medium , and has a birefringence effect, so that the formation of double vision after the refraction of light, causing blurred vision, so it is natural crystal or artificial crystal, are not suitable for glasses.
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