As a blogger, I spend a lot of time working on the computer. If I'm not on my computer, I'm keeping tabs on social media and emails with my smartphone. I know I'm not alone in spending so much time online. Pretty must everyone I know spends a lot of time every day looking at screens. It's how we work, organize our lives, connect with the world and keep up with our favorite shows on Netflix. Computers, tablets and smartphones emit blue-violet ...
