Digital eyestrain includes headaches, blurred vision, irritation, excessive tearing or dry eyes. As we spend more time using computers and hand-held devices, many of us find that our eyes are suffering. Having even small, uncorrected nearsightedness, farsightedness, astigmatism, presbyopia or eye-muscle alignments can affect how comfortably you can work on a computer screen or device. Certain anti-glare coatings help with discomfort by reducing transmission of harmful artificial blue light that is emitted by newer computer screens, devices, tablets and lighting. Use the 20-20-20 rule; every 20 minutes, take a break for 20 seconds and look at something at least 20 feet away.