ZenniOptical only sells their own manufactured products directly to the customer; thus, unnecessary expenses are avoided. Hence, it can afford to make its products incredibly affordable. Despite low priced, the quality of the products is not compromised. Its certified technicians are tasked to meticulously check and assure the quality of the orders. Further, every pair of ZenniOptical eyeglasses, even the lowest $ 8 Zenni Optical Rx Eyeglasses , has high quality stylish frame, thin and light 1.57 index lens, anti scratch coating, full UV protection, lens edge polishing and beveling, quality hard eyeglass case, microfiber lens cleaning cloth, and, most of all, full satisfaction guarantee.