According to Dr. Berman, blue light filtering glasses are safe to wear all the time—with some caveats. For starters, the color of the lenses may limit your ability to comfortably wear them in all environments. “Strongly tinted yellow lenses will block blue light, but they may affect color perception, especially under dim lighting conditions,” Dr. Berman explains.  Similarly, while there’s nothing inherently bad about wearing blue light blocking glasses outdoors, you may not find them to be that comfortable, especially if the lenses are clear. Some users report glare or reflectiveness when it’s sunny outside. It’s also important to keep in mind that your body requires some blue light to function properly. Only when you get too much from “unnatural” sources like digital screens do you run into trouble. It’s smart to take a break from your blue light glasses sometimes, including when you go outdoors—and this is especially true if you wear darker tinted blue light blocking lenses, like orange-tinted ones (which block more blue light than clear lenses).