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Daily Exposure to Blue Light May Damage Cells in the Brain and Retinas

We barely think about the time we spend on our phones or in front of our laptops but it turns out that time may be harming us. New research at Oregon State University is revealing that blue wavelengths produced by common electronics damage brain cells as well as retinas, even if they are not shining in your eyes.

The study was based on experiments conducted on Drosophila melanogaster, the common fruit fly. The work was led by Jaga Giebultowicz, a researcher at the OSU College of Science.

It examined how flies responded to daily 12-hour Exposures to blue LED light, similar to the prevalent blue wavelength in devices like phones and tablets. Those flies exposed to blue light had shorter lives compared to flies kept in total darkness or those kept in light with blue wavelengths filtered out.

The flies exposed to blue light exhibited damage to their retinal cells and brain neurons and had impaired locomotion. The study included mutant flies that did not have eyes, and even those witnessed brain damage and locomotion impairments. This means that the harm done by blue light occurs regardless of whether the victim sees it.

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

"We'd measured the expression of some genes in old flies, and found that stress-response, protective genes were expressed if flies were kept in the light. We hypothesized that light was regulating those genes. Then we started asking, what is it in the light that is harmful to them, and we looked at the spectrum of light. It was very clear cut that although light without blue slightly shortened their lifespan, only blue light alone shortened their lifespan very dramatically. "

Although we cannot discount the fact that natural light is crucial to the body's circadian rhythm, we have to acknowledge that artificial light is a risk factor for sleep and circadian disorders.

The dangers of LED lighting

"And with the widespread use of LED lighting and device displays, humans are subject to increasing amounts of light in the blue spectrum since LEDs are commonly used to emit a high fraction of blue light. But this technology, LED lighting, even in most developed countries, has not been used long enough to know its effects across the human lifespan, "added Giebultowicz.

To protect ourselves from this light, researchers suggest using eyeglasses with amber lenses and setting phones, laptops and other devices to block blue emissions.

The study is published in Aging and Mechanisms of Disease.

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