1. Instructions for use Since color blindness and color weakness vary from person to person, and the color weakness is lighter, you can distinguish the color by wearing it for the first time. If the color weakness is serious, it will take some time to get used to it. It is recommended to wear it for two hours a day for 1-3 months, and the color weakness will improve.<br> 2. Technical Coating Design Color blind glasses appear to have two colors because the lenses are designed with a special coating. In different light environments, viewing from different angles, the lens presents a reflective effect, and the brightness will also change to varying degrees. The working principle of glasses for the blind dictates that the glasses must be colored.<br> 3. The detail design adopts double-sided coating design, paying more attention to color enhancement design, black high-quality and elegant frame, good flexibility, light weight glasses, good wearing experience.<br> 4. High Quality Packaging We provide beautiful glasses case, which is convenient for you to store after use. At the same time, we provide comfortable glasses cloth, which can be wiped at any time.