How to identify original sunglasses

1- Look at the labels or cards attached sunglasses: In addition to sunglasses, there is a card or label with a sticker that contains important information on it, including information on the amount or percentage of UV absorption, the percentage of lens incidence, etc., which is a good glasses. It should carry this information along with it, but it should, for example, be resistant to scratches and high UV absorption. The absence of this information accompanied by sunglasses shows the lack of authenticity and quality of sunglasses.