Spring and summer temperatures rise, jewelry and accessories will make women feel cumbersome. At this point, a pair of beautiful sunglasses with function of vision protect can become the best choice for fashion men to be cool. For sure Sunglasses have decorative functions, but its protection function is the most important one. Because if you can’t obstruct ultraviolet to some extent, it will cause damage to the eyes after long time, so when buying sunglasses, please pay special attentions to the following several points.
The first point is the observation of the lenses, to see if there are scratches, impurities, bubbles and stripe; to check the outer packaging of sunglasses, sunglasses should be marked with the formal name, color, diameter, quality levels, manufacturer and trademarks. The lenses or tags marked with anti-UVA, UVB and CE can ensure to block UV to some extent.
The second is to try on sunglasses to see if there is no dizziness, headache feeling. In current market there are some sunglasses marked with degrees for sale, but because of pupillary distance and other indicators vary, so if there is no professional guidance, the consumer would better not to choose these prescription sunglasses.
Third, handle sunglasses’ two angles onto a fluorescent lamp, let the mirror’s reflective surface scroll, if find specula reflection of sunlight lamp shadow appear wavy or twisted, it proves that the lens is not flat, this mirror will strain your eyes.
Fourth, to see if the lens is flat and clear. The sunglasses lenses material are mainly glass and resin. The best sunglasses lens is Polaroid. It can effectively filter out the reflected light and harmful ultraviolet radiation, and has features such as anti-crushing, guards against rubs.
Fifth, for sunglasses colors, except choosing as per the skin, face shape and wearing, but also according to access sites.
The sixth is to look at sunglasses lenses’ color depths. The color depths are divided into 15%、34%、50%、70%. Indoor and outdoor 15% can be worn; 34% for General outdoor environment; 50% for Sun and sea; 70itlectric welding and other special uses.
Seventh, to see if the sunglasses has a UV-resistant feature. Better to choose the lenses which has UV function. And the UV index should be between 96% and 98%.