Sunglasses have become the essential item for people who pursue the fashion, they would be crazy to buy a wide variety of sunglasses. What's the matter that should pay attention on the glasses online perchasing to protect our eyes?
Do not choose acrylic lens which is easy to heat and deformation, while the best choice is glass or a resin material. Sunglasses should be supported by the bridge of the nose and the ears comfortably. If you feel they lean to one side, adjust them immediately. Besides, that lash don’t touch lenses is also one of measurement criteria.
Don’t select too small lenses. Their function of obstructing light is much inferior. You should take a careful observation if there are scratches, impurities, bubbles, stripes. Check the overwrap of the glasses frames. Normal ones should be marked the name, colour,diameter, quality level, the name of the company and the trademark. There should be anti-UVA, UVB, and CE mark on the lens or hangtag in order to ensure a certain degree of UV separation.
The lenses should be flat with a high degree of penetration, the glasses materials include glass and resin, the best sunglasses should use polarized lenses. Apart from your skin colour, shape of face, dressing, you also need to consider the places you often come and go to decide the colour of sunglasses.
Generally speaking, the filter effect of black, brown color and grey is good. Gray lenses can absorb any chromatogram equally, after wearing the sunglasses, the colours of the objects will become dark instead of changing. Brown lens is able to filter out a large number of blue lights and can improve visual contrast and clarity, it is best to wear under the serious air pollution condition or much fog condition.
Wear sports-type sunglasses during aquatic activities at the beach, in the strongly lightreflecting snowfield or in the strong sunshine. They mostly use the saturation colors of bright color, which can absorb or reflect more visible light.
In addition to relieve the glare's stimulation for comforting the eyes, the main purpose of wearing eyewear is to prevent the eyes from ultraviolet damage. The colour of lenses has nothing to do with blocking UV, even the colour of the lenses is darker, it does not mean it can block UV effectively, Therefore, choose lenses with anti-UV function. Usually UV index of sunglasses is between 96% -98%.
