Jennifer Lopez is wearing them, Kylie Jenner and Rashida Jones are promoting them, and Drew Barrymore is selling them, The New York Times reports. Blue-light glasses seem to be the accessory of the moment. But do we really need them?
Blue-light glasses have lenses that filter out some light waves emitted by the sun and also by digital devices like phones, laptops and tablets. Blue light is not inherently a bad thing: it boosts attention and wakefulness during the day — but it suppresses the natural production of melatonin at night.
The companies that sell the glasses say that by limiting exposure to blue light by as little as 20 percent, people can sleep better, experience less eye strain and prevent possible retinal damage.
But scientists are not convinced that the glasses are worth the investment.
After reviewing several studies that tested the effectiveness of blue-light-blocking lenses, a professor at City University of London and his colleagues concluded that the glasses are not necessary.
“Whichever aspect you look at, it’s very hard to justify spending the extra money,” Dr. John Lawrenson, a professor of clinical visual science, told The Times.