Called "Computer Vision Syndrome" in the 1990s, today the screen-induced eye problems come from a wider variety than just computers, and Americans use them an average of eight to 12 hours a day or more. Redness, itchiness, dryness or overall discomfort may be signs of a bigger problem, so don't wait to see a professional about prolonged conditions. Position your screen so that you are looking slightly down instead of straight-on. "Since your eyes are open more, then your tears evaporate faster, resulting in dryness," she states. Many people who complain of dry eyes are those who wear contacts, so take a break and use glasses when working long hours. If your task is simple enough to do on a cellphone, then take a break from the bigger screen to let your eyes rest.