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Sea or in outdoor sports such as skiing, the wearing of sunglasses to block the light with the functions of, for example, polarizing sunglasses coating. In order to filter the sun shone on the water, land or snow on the direction of the glare of the equality of light, the lens vertically by adding special coatings, can be messy outside the radiation light, scattered light, water, gentle waves into a linear filter light, so that they of eye injury is no longer. Professional polarized sunglasses for outdoor sports activities such as sea, skiing or fishing, but in general daily life, especially in the car, does not apply, because it will let you see it is not clear.