Colored glasses is not equal to sunglasses, choose and buy sunglasses

Sunglasses when the choose and buy should first look at the lens uv and strong light functions, such as: tinted glasses is not equal to sunglasses, recognize uv identification; At six specific should pay attention to the following: 1. Colored glasses is not equal to sunglasses, recognize uv logo below 400 nm uv wavelength, choose sunglasses should recognize 'UV400' logo. This identification can resist ultraviolet light. Some sunglasses can identify 'uv' or '100% uv protection' and so on, this also shows that it has uv protection function. There is no such id don't buy. All kinds of colored glasses on the market a lot, a lot of people think that as long as there is color can block the sun glasses, sunglasses. Actually, this is a myth. Uv and strong light are two main function of sunglasses lens colors mainly to block the action of strong light, make people see things not dazzling, and lenses can prevent ultraviolet ray has nothing to do with color, mainly depends on the lens material and coating. If only figure design beautiful or cheap, buy a pair of wear colored glasses without uv protection function, the harm is bigger than not Dai Jingzi. Because, the human body has a self protective reaction, eyes in bright light, the pupil will naturally shrink, cut into the eyes of ultraviolet (uv) light, but if put on without uv protection function of colored glasses, eyes to accept the light intensity is abate, the pupil will enlarge, let ultraviolet intrusion. 2. Lens color depth is better to moderate the lens color too shallow, block light function will be reduced, to the sunny, still feel dazzling discomfort. Lens color too deep, can affect vision, interference color object, even can't distinguish of traffic lights. Generally, the medium depth of color glasses, can satisfy the People's Daily life. 1 sunglasses factory. 561 color lenses. Specific color lenses shall not influence the object character, to guarantee the eyes comfortable lenses that color on the market a lot, there are mainly dark brown, gray, green, but there are red, yellow and so on. The strong sunlight can let a person see things uncomfortable, mainly associated with the stimulus of yellow light to the eyes. Generally, dark brown, gray, green lens to the yellow light barrier ability is stronger. Specific color can depends on personal preferences, but no matter what color the lens choice, should be to see color distortion, can effectively identify the traffic signal lamp, eyes feel comfortable for the principle. 4. Lens surface is smooth, without a ripple, bubbles, grinding mark, see things deformation sunglasses is a flat lens, lens surface treatment, curved radian, diopter have strict standards, especially the diopter to 0. Less than 008. Only in this way can we see things, not out of shape. Otherwise, wear the diopter excessive amounts of the sun glasses, eyes will feel discomfort, dizziness, etc. Method determine the quality of the lens is simple, it is to take glasses in front to move slowly from side to side, up and down through the lens to see if the object deformation, good-looking pane, door frame, such as line shape object, if discover the bending line, then lens dioptre is unqualified, unfavorable choose and buy. In addition, still should pay attention to the lens surface is smooth, there should be no ripples, bubbles, grinding crack. 5. Picture frame, don't too big picture frame sunglasses is very popular at present, is quite popular with young people. But the size of the glasses and design should be according to personal eyes and face. In general, the lens cover, as long as the eye can completely block the sun, there is no need to chase fashion choice frames very large sunglasses. Sunglasses is too big, broad frames will be oppressed under the orbital branch of trigeminal nerve, usually this kind of glasses after 1 to 2 weeks, can cause eye acid bilges, the eye socket, or between two cheek numbness, perception dull not suitable, such as bad for eye health. 6. Crystal mirror cannot uv street stalls and small shop selling tawny crystal glasses is quite popular among middle-aged and old friends. They believe that this kind of crystal glasses is very beautiful. Actually, crystal glasses without any uv protection function, must not be used as sunglasses.
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