GUNNAR produces the only blue light blocking computer and gaming glasses for kids with Patented Lens (#9417460) Technology that is recommended by doctors to protect and enhance your vision. GUNNAR improves performance while viewing tablets, smartphones, TV & computers to reduce digital eye strain, fatigue and headaches. Unlike other blue light blocking glasses for kids, GUNNAR developed the Blue Light Protection Factor, telling you exactly how much of the peak blue light spectrum (450nm) we're blocking. Not all blue light glasses in the market protects you from the strongest high-energy visible light. The preferred gaming glass for boys and girls, GUNNAR protects against symptoms stemming from prolonged screen-staring including migraines, headaches, dry eyes, blurry vision, negative effects of blue light exposure, cataracts and macular degeneration. SPECS (in mm) Lens Width: 55, Bridge: 16, Temple: 133, Weight: 21gm, Fit: Small. GUNNAR produces ergonomically designed gaming/computer eyewear with a lightweight frame to give you a full day of comfortable screen viewing. INCLUDED with your purchase of our gaming and computer glasses - microfiber pouch, microfiber cleaning cloth, 30-day return policy & one-year warranty. GUNNAR computer glasses protect your eyes and enhance performance. Reduce digital eye strain and block blue light with amber or clear lens tint options.