Lenses are divided into qualified products and high-quality products. Ordinary lenses are prone to yellowing, greasy, unclean, and dirty, which are typical defective products.
Poor lenses are prone to wear marks, and the optical properties of the lenses are reduced, making it impossible for the eyes to see clearly for a long time. Therefore, if you wear unqualified lenses for a long time, the prescription of your eyes will increase instead!
