A. Instructions for Use Since the conditions of color blindness and color weakness vary among individuals, if the degree of color weakness is mild, colors may be distinguishable upon first wearing the glasses. If the color weakness is more severe, it may take some time to adapt. It is recommended to wear the glasses for two hours a day for 1 - 3 months, and the color weakness may improve. B. Technological Coating Design Color - blind glasses appear to have two colors because the lenses adopt a special coating design. In different lighting environments and from different angles, the lenses may show a reflective effect, and the brightness may change to varying degrees. The working principle of color - blind glasses determines that the glasses usually have colors. C. Detailed Design A double - sided coating design is used, with more focus on color enhancement design. The frame is black, of decent quality and has an appealing appearance, with good flexibility. The glasses are light in weight and offer a comfortable wearing experience. D. Packaging A glasses case is provided for storing the glasses after use. Meanwhile, a glasses cloth is also offered for cleaning the glasses at any time. E. Service Customer first is the principle. 24 - hour online after - sales service is available. If there are any problems during the use of the product, you can contact us, and satisfactory after - sales service will be provided. It is hoped that our color - blind glasses will bring you a good experience.