Harvard Health Publishing investigated blue light and its effects on our sleep and health. Our eyes are continually taking in various forms of light—most of it blue light from screens.

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.

A new study concluded that blue light glasses probably have no greater effect on the eyes than non-blue light glasses, contradicting research that says they help with eye strain, sleep quality ...