Both inferior sunglasses can not resist not see ultraviolet light, the result is a pupil expanded to more UV uptake of the eye lens, so be sure to choose a reputable store to buy. Then what buy sunglasses should pay attention to ?
Step / methods
The first observation of the lens for scratches, impurities, bubbles, stripes, check the packaging of sunglasses, sunglasses should be marked with the formal name, color, diameter, quality levels, production and the name and trademark, mirror or tag on that state anti-UVA, UVB and CE mark some sunglasses block UV to ensure.
Try to wear when you buy sunglasses have dizziness, headache feeling. Now the market there are also some marked degree of myopia sunglasses sale, but because the IPD and other indicators vary, so if there is no professional guidance, consumers had better not choose this with prescription sunglasses.
Sunglasses with hand corners facing the fluorescent light, so that the reflective mirror smooth scrolling, if you find the mirror reflection of the fluorescent film appears wavy, distorted shape, proof lens is not flat, so that the mirror can damage eyesight.
Lenses should be smooth, transparent clarity must be high, sunglasses with glass and resin materials, and the best sunglasses polarized lenses should be used. It uses the same light and lens precision synthetic resin sheet by the seven synthesis, the outermost layers of the hard wear-resistant layer; Second, the reinforcing layer six is shatterproof; third, five ultraviolet rays filter layer, the middle layer is the most polarizing filter layer. Polarized lenses can effectively filter out harmful ultraviolet light reflection and have shatterproof, wear and other functions, is the most popular sunglasses.
Sunglasses in addition according to their skin color, face, dressed to match, but should also be based out of places to choose. In general, black, brown, gray filter works well; gray lenses can be balanced against any absorption chromatography, after wearing glasses to see the scene would not be significantly darker color; tinted lenses to filter out a large number of Blu-ray, can improve the visual contrast and clarity, or more serious air pollution in case of wear best effects fog.
What color shades sunglasses for us? Simple self-test method is to wear sunglasses mirror, dimly visible to the limits of its own pupil. The filter effect is too light too; affected the color is too deep sense of color vision has also weakened. This year the popular and colorful light-colored sunglasses, do not use water activities at the beach, a highly reflective snow and sunshine is very strong under the sun, but should wear sports sunglasses, they mostly use bright colors saturated colors that can absorb or reflect more visible light.
In addition to wearing sunglasses to reduce glare stimulation, so that the eyes comfortable, but the main purpose is to prevent ultraviolet light damage to the eyes, while the lenses are UV color is totally different, even if the lens color depth, will not necessarily an effective anti-UV, so be sure to Select the function labeled anti-UV lenses. Sunglasses, UV index is usually 96% -98%, respectively.
Usually, there will be regular optical shop sunglasses UV resistance detected size of the instrument, through this test, you can know whether the hands of the glasses help your eye health.