One Pair "A New Day" Blue Light Filtering Glasses in Tortoise Shell Brown with soft gray cases. New in box. Patented lens-coating technology filters approximately 30% of potentially harmful blue lights. Harmful blue light refers to the 415-455 nano meter range of the visible light spectrum. The percentage represents the average amount of harmful blue light filtered at 5 nanometer increments in this range. Great looking unisex option for both women and men. FREE BONUS "Thank You" Gift with purchase.