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SEABHS
611 W. Union Street
Benson, AZ 85602
(520) 586-0800

AzCH Nurse Assist Line
1-866-495-6735

NAZCARE Warm Line
1-888-404-5530


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Could Screens' Blue Light Make You Old Before Your Time?

HealthDay News
by -- Robert Preidt
Updated: Oct 22nd 2019

new article illustration

TUESDAY, Oct. 22, 2019 (HealthDay News) -- Daily exposure to blue light from sources such as smartphones, computers and household fixtures could speed your aging, even if it doesn't reach your eyes, research in animals suggests.

Blue wavelengths produced by light-emitting diodes (LEDs) may damage cells in your brain as well as your retinas, according to the Oregon State University researchers.

Their study of fruit flies found that the lives of those exposed to daily cycles of 12 hours in blue light and 12 hours in darkness were shorter than those of flies kept in total darkness or in light with blue wavelengths filtered out.

The flies exposed to blue light had damage to their retinal cells and brain neurons, and their ability to climb the walls of their enclosures -- a common behavior -- was impaired.

Some of the flies were mutants that don't develop eyes, but even those had brain damage and impaired movement when exposed to blue light. The researchers said this suggests that the flies didn't have to see the blue light to be harmed by it.

The study was published online Oct. 17 in the journal Aging and Mechanisms of Disease.

"The fact that the light was accelerating aging in the flies was very surprising to us at first," said study leader Jaga Giebultowicz, a professor of integrative biology.

"We'd measured expression of some genes in old flies, and found that stress-response, protective genes were expressed if flies were kept in light. We hypothesized that light was regulating those genes," she explained in a university news release.

Then researchers wondered how the light was harming them.

"We looked at the spectrum of light," Giebultowicz said. "It was very clear cut that although light without blue slightly shortened their lifespan, just blue light alone shortened their lifespan very dramatically."

She said humans are increasingly being exposed to blue light through widespread use of LED lighting and electronic devices, but the technology hasn't been around long enough to know its effects over a lifetime.

Results of animal testing are sometimes different in humans.

But researchers noted that eyeglasses with amber lenses filter out the blue light and protect your retinas, and that phones, laptops and other devices can be set to block blue emissions.

More information

Harvard Medical School has more on blue light.