Parents (USA)



The idea: Blue light “comes from the sun, indoor lighting, and screens, and can prevent you from producing the sleep hormone melatonin,” says Melissa Contreras, O.D., assistant professor of optometry at Marshall B. Ketchum University, in Fullerton, California. Like coffee, it’s clutch in the morning for energizing but less than ideal at night. Blue-light glasses filter out this wavelength, potentiall­y limiting sleep-disrupting effects.

When to wear them: When you’re on a screen and at the end of the day, Dr. Contreras says. But don’t wear them outside; they don’t offer UV protection.

What to look for: Not a lot of research exists yet on how beneficial blue-light glasses are or how much they should filter out, but most lenses available block about 40 percent. Glasses by Felix Gray (prescripti­on, nonprescri­ption, and readers) filter 50 percent of all blue light ($95 and up; You might also consider a screen protector, like one from Eyejust ($20 and up;

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