The following is from CBS News, Phoenix, AZ
There are some 30,000 cells in your eyes that react to something called blue light. That blue light is found in, you guessed it, smartphones, LED monitors, computers, and laptops. Those blue light emissions could be causing deterioration in your eyes.
Some scientists are beginning to link age-related macular degeneration with blue light, although nothing has been proved just yet.
If you are reading something from an LED monitor, take frequent breaks and that will reduce your risk of developing stress in the back of the eye,