I spend at a minimum 5 hours a day programming, analyzing data and gaming, and recently found myself getting blurred vision and a lot of headaches at the end of the day. One of my friends told me to try blue light blocking glasses, and after learning a little bit more from glassy about how they work, I got a pair, and I haven’t had a headache or eye strain since. I use them every day, they look great and they work great. Thanks for an awesome product!!