Precautions must buy sunglasses

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From the above description of several types of sunglasses, we know different occasions and people in different types of sunglasses. We first determine their purchase to buy sunglasses for shade or with apparel decoration? In addition to shade, anti-ultraviolet function requirements? Are there any special requirements for the safety performance of the lens? Only clear these goals combined with style and wear in my face the practical effect, in order to buy the right pair of Tiffany Outlet sunglasses.
Not all sunglasses have anti-ultraviolet function sunglasses a meet the basic requirements of the standard and can only say do not block the light at the same time through more UV. If a pair of sunglasses can block light and can not block the same amount of ultraviolet light, wearers will accept than not wearing sunglasses more UV light (wear sunglasses into the human eye will reduce the flux resulting wearers increased pupil). Sunglasses sales counter of the store, lenses, tag or packaging generally have obvious signs, like the clothing fabric ingredients label as consumers to buy, be sure to look carefully at.
Whether a pair of sunglasses with anti-ultraviolet function, we can not distinguish with the naked eye, the only reference of the express commitment of the manufacturer of the products consumers buy Cheap Oakley Sunglasses with protective function, we can see such positive in some product labels and glasses : "100% UV", "UV400", "block all UV", "anti-UV" and express identity.
Safety performance sunglasses lens impact material such as PC tablets, often marked with labels and instructions on "impact resistance", approved by FDA. "," Meet the highest standards of Europe and the United States " if the product can reach identification requirements, special requirements of motorcycle riders, drivers and other security consumers is a good choice.
Commitment on the product label, the consumers have to learn to protect themselves, either save the label or description, or let the businesses to be indicated on the invoice, in the event of disputes, do not go so far should be the lack of evidence and passive.
The degree of lens should meet the requirements for plain lenses and optical flaws should not affect the vision. Simple identification method for sunglasses can be placed in front of a distant target, such as window frames or door frames, as viewed through the lens, and then the glasses up and down to move back and forth, the goal should not swing and wave-shaped deformation.
The color of the lens can not be partial, should the ambient color distortion, sharp edges of objects have the ability to effectively identify the different color lights. Lens color depth, places and activities required for the different light sources and occasions, the color of the lens will affect the shading effect. For the sunglasses can effectively block the summer strong light, the color of the glasses have enough depth, generally better in dark gray, dark brown and black, followed by blue and purple worst because of the two lenses through more UV rays. Yellow, orange and pink do not try. However, bike or car, do not choose the lens color is too dark. Vulnerable to improper eye wear Ray Ban Outlet sunglasses, cloudy, and there is no need to wear sunglasses indoors. Some people regardless of settings, regardless of sunlight intensity, even in the evening, in the evening as well as in movies, television, also wearing sunglasses, which will inevitably increase the burden of adjusting the eye, causing eye muscle tension and fatigue, vision loss, depending on fuzzy objects, severe dizziness, not for a long time as the other symptoms appear.