While studies haven't proven conclusively that blue light will damage your retina or even cause severe eyes diseases, such as macular degeneration, eye strain is the real problem. If you've ever dealt with blurry vision, dry or gritty eyes, eye redness, or problems getting your eyes to focus, you know how frustrating and even painful eye strain can be. Plus, the more you strain your eyes, the worse your headaches will be.
As studies haven't proven more severe issues are possible, increasing amounts of screen time could later prove that blue light is more dangerous than just eye strain.
For those more prone to eye-related illness, such as seniors, consider smartphones that have blue light filters built in.