The sunglasses you don't know
You wear sunglasses every day, look at the appearance of a professional fashion, but you may be a sunglasses 'illiterate', why do you say so, because you may even sunglasses basic common sense all don't understand, do not believe you that you look down, look at those sunglasses when you don't know. A, sunglasses can be 100% uv protection? Many people believe that as long as can 100% uv protection sunglasses, actually this is wrong, the inferior sunglasses aside, high quality sunglasses can basically eliminate ultraviolet irradiation. Uv protection function of sunglasses in general there are several kinds of express way: 1, mark 'UV400' : said the lens of uv isolation wavelength of 400 nm, namely the wavelength at 400 nm, the spectral transmittance of the following values is not greater than 2%. 2, mark 'UV', 'UV' : said the lens of UV cutoff wavelength of 380 nm. 3, mark '100% UV absorption' : it means the lens is 100% for UV absorption function, that is to say, in the ultraviolet range of average transmission ratio is not greater than zero. 5%. Generally have the annotation is truly in the true sense of uv protection function of sunglasses. Sunglasses factory YC9702 general sunglasses C1 black box white leg/lens dazzle colour silver 2, polarized sunglasses are better than ordinary sunglasses? Polarizer and ordinary sunglasses no good or bad, just different occasions should choose different function of sunglasses. Polarized sunglasses can reflex the light scattered in the natural light, glare and irregular objects reflect light block, can make the light on the right track through optical axis in the eyes of a visual image, make the vision clear natural, generally suitable for driving, fishing, sailing, white water rafting, skiing and other outdoor activities. Because the polarizer lens is generally dark color, so not suitable for cloudy or indoor use. Third, sunglass is only suitable for wear in summer? In our daily life, sunglasses always seems to be in the summer sun burned eyes only remembered by people. Actually, sunglasses, not only need to wear in the summer, the purpose of wearing sunglasses is primarily to isolate uv, and ultraviolet (uv) exist in all the year round, that is to say, all the year round can wear sunglasses. Sunglasses factory YC9708 general sunglasses C7 black box silver leg/lens ash four years, sunglasses can be continuous use? Generally high quality sunglasses lens material is special material, will with the passage of time and aging. Incorrect wearing habits, may also damage the sunglasses, even cause deformation, become loose, reduce the service life. So, it is suggested that 1 - 2 years to replace the new sunglasses. Five, the children and the elderly are not suitable for wearing sunglasses? Like side wear sunglasses are fashionable young people, a lot of people think the sunglasses is the patent of young people, the elderly and children to wear sunglasses in a while might actually be a positive way of eye. But children under the age of six should not be wearing sunglasses, their visual function is not yet mature, wearing sunglasses object will become dark, and this affects the visual development or form amblyopia.
related: sun glasses sunglasses
related: sun glasses sunglasses