GUNNAR produces the only blue light blocking computer and gaming glasses 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, 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 men and women, 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: 58, Bridge: 17, Temple: 135, Weight: 33gm, Fit: Medium. GUNNAR produces ergonomically designed gaming/computer eyewear with a lightweight frame to give you a full day of comfortable screen viewing.