In the past, most of our worries about premature aging and skin cancer stemmed from the damaging UVA and UVB rays from the sun. But over the last decade, scientists have learned that these may not be the only rays of visible light people need to be concerned with. Blue light — emitted by both the sun and digital devices — could be wreaking havoc on skin health.

“The trend of blue-light blocking in skin care, and wellness in general, is increasing because we are all exposed to blue light more now with the use of smartphones and tablets,” says Nazanin Saedi, MD, director of the Jefferson Laser Surgery and Cosmetic Dermatology Center in Philadelphia.