Sunglasses should be selected to recognize identity. There are instructions for this logo can resist ultraviolet rays. Some sunglasses identify UV or ultraviolet radiation, which also shows its anti-ultraviolet function. No do not buy this type of identity. Need to be reminded that colored tinted glasses on the market a lot, a lot of people think that as long as the color can block the sun glasses is sunglasses. In fact, this is a misunderstanding. Block glare and UV protection Cheap Oakleys Frogskins Sunglasses Outlet sunglasses two main functions, the role of the lens color is mainly block glare, people see things not dazzling, but the color of the lens has nothing to do with whether the UV, depending on the lens material and coating the situation. If only chart styles pretty or cheap, do not buy pair of UV protection wears tinted glasses, a greater harm than not wearing a mirror.
Sunglasses lenses currently on the market, many colors, mainly brown, gray, green, but there are red, yellow and so on. In general, brown, gray, green on yellow lenses blocking ability. Specific color according to personal preferences, but no matter what color lens choice should be something to see color distortion, can effectively identify traffic lights, eyes feel comfortable as a principle. The simplest way to determine the quality of the lens, is to take the glasses slowly moving up and down in front, through the lens to see whether the object deformation, the best looking panes, door-like objects such as lines, curved lines, if found, then the diaper lens failed, not election purchase. Furthermore, it should pay attention to whether the lens surface is smooth; there should be no ripples, bubbles, grinding marks.
Qualified sunglasses must be able to block ultraviolet through traffic signals of different colors with good resolution and regular sunglasses are plain mirror series, diaper strictly controlled. But some diaper excessive sun glasses, some even up to ten degrees. Wear Discount Oakleys Flak Jacket Sunglasses Cheap sunglasses so is tantamount to wear a pair of glasses or hyperopic glasses, one after the summer became real patients with refractive errors. In addition, if there is no protection to wear a colored glasses, is more dangerous than not wearing sunglasses, because the human body has a self-preservation instinct, his eyes encountered light, the pupil will naturally become smaller, making the reduction of UV energy entering the eye, Once wear no protection glasses, midrise, then the door wide open eyes equals, despite UV-invasive, and greatly increased energy, damage to the eyes can be imagined.
Sunglasses have been able to block ultraviolet light, because the lenses add a layer of special coating. Good general quality sunglasses, a strong ability to block UV light transmittance decreased and small, do not affect the general visual clarity. And there is a certain lens coating hardness, surface easy to wear. Low-quality Tiffany and Co Bracelet Jewelry Outlet sunglasses are completely different, not only block UV performance is not strong, the film is easily damaged, and a serious decline in the lens transmittance. Coupled with the irregular surface of the lens, see external objects deformed distorted, so that the eye soreness, the gradual emergence of nausea, loss of appetite, forgetfulness, insomnia and other symptoms of visual fatigue. In addition, low-cost eyeglass lenses extremely prone to dispersion phenomena, such as long-term wear eye sunglasses will make people feel tired, and thus damage the eyes.