Of course, if sun is getting in your eyes, it’s essential you put on some sunglasses to protect your orbs (not to mention, squinting can lead to wrinkles down the line). But wearing sunglasses every single second you’re outside might block some of the natural light and mess with your internal clock, Twyman says. 

And if you’re going to wear blue light glasses, try to reserve them for the times you’re in front of the screen, as natural blue light outside is not something to worry about. “Blue light by itself is not the problem,” Twyman says. “In mother nature, blue and red light are always balanced, and that’s the problem—it’s the lack of red light that you’re getting from your devices,” he notes.

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