subject: The Overlook For Picking Glasses [print this page] Sunglasses have become a necessity for the fashion lovers and they will buy a wide variety of sunglasses in a crazy way. What should we pay attention to when choosing sunglasses, for the aim of protecting our eyes?
Do not buy acrylic lenses, which are easy to be heated then cause the deformation. The best choices are glass or a resin material. The glasses should be on the nose and ears evenly, if you feel lean to one side, you should adjust immediately. Besides the lash doesn't touch the lens is also one of the yardsticks.
Don't choose the sun glasses with too small galss, this will less the effect of the glass with blocking the sun lights. You should take a careful observation if there are scratches, impurities, bubbles, stripes. Check the overwrap of eyeglasses, normal sunglasses should be marked with the formal name, color, diameter, quality level, production factory name and trademark. Sun glasses with the sigh of preventing UVA, UVB and CE on the glass surface or the name tag can make sure the certain block of ultraviolet.
Lenses should be smooth and have a higher penetration degree, lenses materials consist of glass and resin, and the best lenses should polarized lenses. The color of sunglasses not only should match accord with people's skin color, facial features, dresses t, but also should base on the circumstance around them.
In general, the black, brown and gray lens has good filter effect. Gray lens can absorb any chromatogram evenly, after wearing glasses, the scene only darken without obvious color difference. Dark brown can filter out a large number of blue lights, which can improve the visual contrast and clarity, especially under fog weather or serious air pollution.
Wear sports-type sunglasses during aquatic activities at the beach, in the strongly lightreflecting snowfield or in the strong sunshine. Most of them adopt flashy and bright saturation colours which can absorb or reflect more visible light.
Wearing glasses in addition to reduce the glare stimulation to make eyes comfortable, the main purpose is to prevent the eyes from the ultraviolet damage. And the lens color is different from screening UV, even though the lens color is darker, it may not be more effective in anti-UV. So you must choose that kind of lens with the mark of screening UV function. In general, the degree of screening UV of sunglasses should be between 96% and 98%.
