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√We recommend wearing it for 1-2 hours a day and continuously for no less than a week. This will ensure better wearing experience and better results. √Our glasses use an advanced light-filtering technology that refines the light before it reaches the eyes. Then the glasses will turn the spectrum into an acceptable band. This allows the eyes to accept the color information which makes it possible to send the right signals to the brain. √Why Choose Our Color Blind Glasses? 1. Suitable for both indoor and outdoor use 2. Comes with modern and fashion design with frame 3. A great gift for people 4.100% money back warranty for 30 days with prompt customer service