Choose a perfect sunglasses

☆ eye protection UV not only hurt the eyelids, while endangering other parts of the cornea, lens and eye.Ultraviolet radiation can also cause cataracts, age-related macular disease (age-related macular degeneration), and eye cancer and eyelids cancer. Wear lenses with anti-ultraviolet function, can reduce eye in the sunny glare, long time squinting things visual fatigue (eye strain). Mayo Clinic doctors recommend that consumers buy sunglasses, be sure to read the instructions on the packaging of goods in detail, in order to ensure that the lenses with anti-ultraviolet function, and can block 99-100% of the sun's UV-A light and UV-B light.Do not buy sunglasses labeled "decorative purposes", and no details on the label UV protection sunglasses. Best choice lens glasses, or wrap-around sun glasses. Some contact lenses have UV protection, but the range of contact lenses can not cover the entire eye, and still have to wear sunglasses outdoors.
☆ frame material Material aspects of plastic frame sunglasses color rich change, and usually very easy to adjust, allows consumers to wear very comfortable. If you want to wear a variety of styles colors, the optional plastic material sunglasses. Sunglasses with metal frame, the overall profile is relatively thin, looks relatively light, not so heavy. For example, the sunglasses made of titanium is very light weight, very durable. Regardless of sunglasses is the frame of what kind of shape or material, it is important to feel very comfortable to wear, not too heavy. Not adjusted if worn, sun glasses, it is easy to slip on the bridge of the nose. If we can ensure that wear glasses feet comfortably around the ears, and will be able to avoid this phenomenon. ☆ lens types The different types of lenses for different activities. Polarized lenses (polarized lenses) to reduce the glare from the reflective surface of the water, snow, make objects appear more clearly. Polarized lenses, however, generally do not have the isolated ultraviolet functionality, unless special lenses with a layer of UV protection film. The brown lens allows the color difference more obvious, and enhance the look of monochromatic objects clarity. For example, wearing brown lens sunglasses on the ski slopes skiing, mountain peaks and valleys are very clear, and increase security. Yellow lenses effectively block the Blu-ray, can clearly see distant objects, especially in dim light, but the plastic lens filters blue light may be difficult to identify the color of the traffic signal. The gray lenses maximize presents the true color of the scene, effectively reducing the light intensity. Mayo Clinic doctor further explained, resin really need to take the time to adjust the lens color according to the ambient light changes color lenses (Photochromic lenses), but it can reduce glare, and effectively maintain clarity. Not all resin photochromic lenses provide adequate UV protection, trade description must be read. Polycarbonate safety lenses (Polycarbonate lenses) anti-collision sports eye protection sunglasses can completely block ultraviolet radiation. As for the mirror reflective lens can block visible light, but may not be able to block ultraviolet rays.