A simple app to test your vision and find out if you suffer from Digital Eye Strain. Nearly everyone owns a mobile device and most adults use them all day long. As a result, up to 70% of adults have reported suffering from Digital Eye Strain. Some of the symptoms include headaches, stiff neck and tired eyes, especially at the end of the day. Find out more about Digital Eye Strain as well as a revolutionary new lens designed for your digital lifestyle – ZEISS Digital Smart Lens – available at Walmart Vision Centers and Sam’s Club Optical.