Hiking for sunglasses
In hot summer day, in addition to the umbrella, hat can shade, sun glasses is against ultraviolet light weapons. Dazzling light will pass through your eyes, the sun glasses could reduce the damage to eyes intense sunshine, dazzling light will cause headache, the sun glasses have the filtering effect of 95 ~ 100. Most people the choice of sunglasses for still stay in beautiful consideration, think that the sun glasses is fashionable accessories, in the shapes of glasses as the first consideration when buying requirements, even boutiques will put a lot of sunglasses for people to choose and buy to tie-in dress. The sun glasses have the function of decoration, but its protective function that is important. Because if there is no moderate blocking ultraviolet ray, come down for a long time will cause harm to the eyes. ( Should be absorbed by the lens of ultraviolet ray, if absorbed completely into the retina, will produce a macular lesions, but if absorbed completely will enter the lens and lens opacity, and produce the serious eye diseases such as cataracts. ) So bad if you wear a pair of glasses, rather than the function of protection, it hurt the eyes that thed loss outweights the gain. How to choose a pair of suitable sunglasses? The five kinds of common dyeing lens: low pink lens: this is a very common color. It can absorb 95 ultraviolet ray, and some of the shorter wavelength of visible light. In fact, such functionality is similar to general not tinted lenses, that is to say, the pink lens will not has more protection than normal lens. But for some people, there is still a big help in psychology, because they feel more comfortable to wear. Low gray lenses: can absorb infrared and ultraviolet 98. Grey lens big benefit is won't make the scene of the original color change due to the lens, and the big satisfactory is that it can be very effective in reducing the light intensity. Low green lens: green lenses can say represented by the 'ray ban' series of lenses, it and grey lens, can effectively absorb infrared light and 99 ultraviolet light. But the green lens distortion will make the color change of some scenery. Moreover, the effects of blocking the light slightly less grey lenses, however, green was still is excellent protection glasses. Low brown lens: the lens and the types of the light absorbance green lens is similar, but the lens absorbs more blue than green. Brown lens distortion of color to the lens more big than the gray, green, as a result, the average person's degree of satisfaction is low. But it provides another kind of color to choose, and can decrease slightly blue halo, make the image more clearly. Low yellow lenses: can absorb 100 ultraviolet ray, and allows the infrared and visible light through the lens of 83. Yellow lenses big features absorbed most of the blue. Because the sun light through the atmosphere, mainly performance (blu-ray This could explain why the sky is blue) 。 Yellow lenses absorb blue light, can make the nature scenery more clear, therefore, the yellow lenses are commonly used to as a 'filter', or when the hunters hunting used. However, no one can prove shooter because wearing yellow glasses, thus better target shooting.