Many people use their electronic devices, including phones, tablets, and computers, for extended periods. Companies now sell screen protectors that reportedly block blue light and benefit eye health.

Blue light usually comes from the sun but also from digital screens and LED lights. Some experts believe artificial sources may be causing eye damage in humans, but animal studies are inconclusive.

Many know blue light as the chunk of the visible spectrum emitted from digital devices that can disrupt the sleep cycle if viewed at night. Now, research is starting to show that blue light can be ...