The results of a 2018 study at the University of Toledo found consistent exposure to blue light leads to macular degeneration, a leading cause of blindness.

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More research is needed to determine exactly how blue light affects the human eye, but until then, experts worry results like these can be misleading.

According to the CAO, it can lead to headaches, blurred vision, eye irritation, double vision, excessive tearing or dry eyes, eye pain or excessive blinking.

When it comes to keeping your circadian rhythm in check, van Dijk recommends avoiding your phone for two hours prior to sleeping.

If you’ve ever sat at a computer for longer than a few hours, you’ve probably experienced symptoms like blurred vision, trouble focusing your vision and even headaches. This is known as digital eye strain.

He also notes that exposure to blue light while outdoors is much more severe than anything you get from your phone or computer.

In response, the American Academy of Ophthalmology published a statement saying the opposite: “blue light from electronic screens is not making you blind.”

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It’s emitted from your smartphone, tablet and computer, but one of the biggest sources of blue light is actually the sun — you’re exposed to blue light whenever you step outside, said Nelson.

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Blue light is at the end of the spectrum of visible light and it plays an important part in our ability to be alert, said Dr. Michael Nelson, president of the Canadian Association of Optometrists (CAO).

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If you wear glasses, you’ve probably been recommended a special coating for your lenses to shield your eyes from blue light.

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“It’s not comparable to screens … we can’t equate this study environment with real life and we can’t equate the blue light they use in those studies with the light coming off your device.”

“We get blue light from all our devices, but when you walk outside, you’re also exposed to blue light,” he said. “The amount of blue light you’re exposed to outdoors is probably 30 times as much as you get from your device, which I believe is more cause for concern.”

Unfortunately, digital eye strain can lead to cumulative damage over time if you don’t take the proper steps to mitigate it.

“Focusing issues and dryness can definitely cause fatigue, but somehow, blue light has gotten linked in there as well,” he said.

Specifically, researchers proved that a molecule in the eye called retinal, when combined with blue light, can kill cells.

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There is evidence to show that blue light — both from the sun and your phone — can disrupt your circadian rhythm, which governs your body’s energy levels based on the anticipated cycles of day and night.

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“We blink less when we’re looking at screens, and when we look at things up close, our eyes’ focusing muscles have to flex and those muscles can get tight, just like any other muscle can,” van Dijk said.

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“Blue light from your screens could be keeping you up, affecting your sleep and making you feel less rested the next day,” said Dr. Cody van Dijk co-chair of the public relations committee at the Manitoba Association of Optometrists.

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Digital eye strain is caused primarily by dryness, said Nelson, which occurs when you use devices because you blink less. This can make it more difficult to focus in the long run.

It can also be helpful to change bedroom lighting to a warmer colour, and for some people, reading glasses with a blue light filter can also help.

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“Studies (like the one at the University of Toledo) have shown that blue light can affect cells or non-human eyes in laboratory environments, but it’s very important to remember that these experimental conditions do not mimic real life,” van Dijk said.

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“If the screen is unavoidable, we can shift our smartphone display to a warmer colour,” he said. “There are apps or settings that can do that automatically.”

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“We know that using devices, whether it’s your phone or tablet or computer, that can cause eye strain, but there are no studies to show that’s linked to blue light,” said Nelson.

If research finds that exposure to blue light is harmful, there could be some benefit to using light filters outdoors, said Nelson, but right now, that isn’t the case.

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The study did not show that blue light is damaging the eye itself — it just showed how blue light could potentially cause damage.

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“We know that blue light is affecting our sleep, but there is not significant evidence to suggest that the blue light from your device is harming your eyes in any way.”

Nelson also fears there’s been “self-generated buzz” online about blue light filters and what they can do to “protect” your eyes.

Shortly after the study was published, it was widely reported that blue light from your phone or your computer can cause blindness.

For example, a new study out of Manchester University tested light of different colour and found that when light was dimmed, blue light was “more restful” than yellow light.

It regulates hormones, blood pressure, body temperature and metabolism over a roughly 24-hour cycle, so the body knows when to wake up, eat and sleep each day.

In the past few years, there has been plenty of discussion about the potential negative side effects of blue light. However, doctors like Nelson worry some of it has been misleading.

For this reason, van Dijk worries the results of these studies are being misinterpreted and, in some cases, blown out of proportion.