Crystal glasses you can support projects
Crystal glasses to raising projects, this statement is inappropriate, due to crystal hard, good insulation, wear a cool feeling, so known as raising projects to share, but through the crystal lens to about 80% of UV rays , while the UV is harmful to human eyes, the eyes too much to absorb ultraviolet light, the formation of lens opacities, affecting vision, according to international norms, to allow through the glasses of the long-wave ultraviolet UVA should be below 10%, while Poland UVB ultraviolet light should not be through, or will the formation of the eye injury, but the crystal was able through the lens of about 90% of the long-wave ultraviolet UVA, UVB by approximately 90% of the ultraviolet, so the purpose of advantage if used to support the advantages of UV damage to cf , the real gains and losses is equivalent to the ordinary optical lens, high-refraction glass lenses, coated lenses and so the absorption of UV radiation and block the function, comparable to, the crystal glasses of the optical properties of optical glass is much less common, along with Crystal is the quartz crystal, the internal multi-containing impurities, irregular, flocculent cotton between ripple, the average non-media, and has birefringence effect, the refraction of light after a double image, the formation of blurred vision, so it is natural crystal, or artificial crystal, are inappropriate to do glasses. Large frame sunglasses with good, because a large hinge in the frame to wear when the sun just press the edge of the infraorbital infraorbital nerve in the export, with the extension of time with a mirror, it will show some skin around the eye numb, dull, depending on the fatigue and other symptoms, so the initiative of a small bar or choose your frame of sunglasses. I really do not maintain eye sunglasses with skin patches that may not necessarily long, the skin around the eye can be a long spot, with little to ultraviolet light, and the body’s endocrine, so do not think that will be able to maintain around the eye wear sunglasses skin, in fact, only with sunglasses maintain your eyes.
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