Gunnar Optiks Emissary Computer Glasses - Block Blue Light, Anti-Glare, minimize Digital Eye Strain - Prevent Headaches, Reduce Eye Fatigue and Sleep Better Protect Your Eyes - High Energy Blue Light emitted by electronic devices such as computers, tablets, and smartphones have shown to increase the risk of accumulated damage to the retina, cataracts, sleep disorders and macular degeneration. Block Blue Light - Block 15% of harmful blue light, 100% of UV. Prevent short-term and long-term damage like macular degeneration, cataracts, and the reduction of melatonin production. Sleep Better - Block blue light and reduce eye strain that affects your bodies circadian rhythms and prevents healthy restorative restful sleep you need to perform daily and prevent health issues. Reduce Eye Strain - minimize headaches, dry eye and eye fatigue, anti reflective coatings and patented focusing power 0.20 mag. Comfort and Protection - lightweight durable comfortable frame materials fit ergonomically with your face and head, FDA Approved. Rested eyes, no headaches, better sleep, no eye damage caused by blue light from digital devices = happier people and world.