I was looking for non-prescription computer glasses that would help me with my eye strain & headache problems after looking at a computer screen for a long period of time. I read good reviews of this product and decided to place an order. The glasses was delivered on time and I immediately loved them when I first tried them on as they are so light, comfortable, look nice, and help solve my problems. Unfortunately, the glasses had some scratches, which I later informed the seller through email. He replied to me within a day and sent me a new pair for free. I really appreciate such good service and impressive product. I would strongly recommend this product and this seller.