1. Instructions for Use As the conditions of color blindness and color weakness differ among individuals, if the degree of color weakness is mild, color discrimination may be achieved upon first wearing the glasses. If the color weakness is more severe, a certain period of time is needed for adaptation. It is recommended to wear the glasses for two hours a day and keep it up for 1 - 3 months, and the color - weakness condition may improve. 2. Technological Coating Design Color - blind glasses appear to have two colors because the lenses adopt a special coating design. Under different lighting environments and from different angles, the lenses may present a reflective effect, and the brightness may vary to different degrees. The working principle of color - blind glasses means that the glasses usually have colors. 3. Detailed Design It uses a double - sided coating design and focuses on color enhancement design. The black frame is of good flexibility, the glasses are light in weight, and the wearing experience is good. 4. Exquisite Packaging An exquisite glasses case is provided for storing the glasses after use. At the same time, a comfortable glasses cloth is also offered for wiping the glasses at any time. 5. Attentive Service Customer first is the principle. 24 - hour online after - sales service is provided. If there are any problems during the use of the product, contact can be made at any time, and satisfactory after - sales service will be offered. It is hoped that the color - blind glasses will bring a good experience.