1. Instructions for UseBecause color blindness and color weakness vary from person to person, the color weakness is lighter, then the color can be distinguished by the first wear. If the color weakness is more serious, it needs a certain period of time to adapt. We recommend wearing it for two hours one day , inisting on 1-3 months, the color weakness will be improved2. Technological Coating DesignColorblind Glasses appear to have two colors, because the lens adopts a special coating design. Under different light environments and viewing from different angles, the lens shows a reflective effect, and the brightness will vary to different degrees. The working principle of blind glasses determines that the glasses must have color.3. Detail Design Adopt double-sided coating design, pay more attention to color enhancement design, black high-quality and elegant frame, flexible well, the weight of the glasses is light, and it has a good wearing experience.4.Premium Packaging We provide exquisite glasses cases, convenient for you to store after used. Same time, we provide comfortable glasses cloth, which can be wiped off at any time.5.Warm-Hearted Service Customer first is our principle, We provide 24-hour online after-sales service. You can contact us for any questions about the product during using, we will provide you with satisfactory after-sales service, Looking forward to our blindness glasses to bring you a good experience Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store