Sunglasses have become a necessity for the fashion lovers and they will buy a wide variety of sunglasses in a crazy way. What should you pay attention to when buying prescription sunglasses in order to protect your eyes better?

Do not choose acrylic lens which is easy to heat and deformation, while the best choice is 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. In addition, eyelashes keeping distance with the lens is also a measure 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. And check the packaging of fashion glasses, the standard sunglasses should be marked with the formal name, color, diameter, quality levels, production factory name and trademark. Only sunglasses with mirror face or hangtag marked with preventing UVA, UVB and CE can prevent constant UV.

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 sunglasses color should be selected in addition according to your skin color, face shape, dressing, you must also choose according to the places you are going.

In general, black, brown, gray lens has a good effect of filtering light. Gray lens can absorb any chromatogram evenly, after wearing glasses, the scene only darken without obvious color difference. Tawny lenses are able to filter out a great deal of blue light and improve visual contrast degree and clarity degree, in a seriously polluted environment or foggy circumstance, tawny lenses will have a particularly good effect.

At the beach, on strong light reflective snow ground and in strong sunlight, you should wear sports-type sunglasses, Most of the sport sun glasses using the bright saturated colors, they can abosorb or reflect more lights.

In addition, wearing bifocal glasses is to reduce glare stimulation to make the eyes be comfortable, the main purpose is to prevent ultraviolet damage to the eyes. 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 make sure to select the lens labeled anti-UV functions. Usually sunglass's UV index is between 96% and 98%.