All the time we spend on computer screens and smartphones is taking a toll on our eyes. A new survey of more than 10,000 adults shows that 65 percent of Americans experience uncomfortable symptoms of digital eye strain, such as headaches, dry or irritated eyes, blurry visions, and neck pain. The condition is most prevalent among Millennials, who tend to use more than one device simultaneously. Holding small screens less than a foot from their eyes reduces the rate of blinking which can lead to eye dryness, irritation and redness. Digital screens also emit blue lights, which may cause cellular damage deep inside the eye. “Our eyes are not built to stare at digital screens all day but the demands of our modern-day world frequently put us in front of a screen for hours every day,” optometrists Justin Bazan tells MedicalDaily.com. “It’s the problem everyone has but no one knows they have.” He and other eye experts advise taking a 20-second break every 20 minutes and looking 20 feet away, which will relax your focusing muscles.