What is the history of the light blue in the Puerto Rican flag? It's one that tells a story of defiance, revolution, and control.

Blue light, often blamed for sleep problems, is now at the center of new animal research from the journal Physiology & Behavior suggesting it can ease anxiety caused by constant vibration and noise.

Among the fads to emerge from the pandemic − sourdough bread making, TikTok dancing, sweatpants tie-dying − wearing blue light glasses to cope with increased screen exposure remains popular. As our ...

We’re staring at our devices more than ever, and besides eating up our time, they’re giving off tons of light. Blue light has gotten an especially bad rap, but that’s not quite fair: It’s just one ...

Blue light-blocking glasses claim to reduce eye strain from screens, preserve eye health, and help with sleep. But do they actually work? Experts weigh in. In recent years, blue light-blocking glasses ...

Blue light therapy may help with depression, but it is still not clear exactly how effective it is. Depression is a mood disorder associated with a loss of interest in activities, low mood, and ...

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? At the simplest level, different colors of light have different wavelengths.

Staring at an electronic device for hours each day is something many of us do. Whether it’s work-related computer use, social scrolling on your smartphone, or streaming your favorite show on a tablet ...

As SELF has previously reported, visible light occupies wavelengths between about 380 and 700 nanometers (nm)—blue light falls between 400 and 500 nm on that spectrum. Effective blue light eyeglasses ...