Should you wear anti-blue light glasses in front of a computer?

After a day working at the computer, Matthew Segal was in some pain. So, in July, this young 24-year-old statistician, who was already wearing corrective glasses, took the plunge by outfitting himself with glasses that were supposed to shield him from the blue light emitted by screens. “I have the impression that it is very effective, says this Toulouse (Haute-Garonne)-born. My eyes hurt less when I get home!”

Like him, more and more French people are adopting anti-blue light glasses, while the use of screens has increased dramatically. Both seek to protect against the often-referenced risks of prolonged exposure to this radiation, such as premature aging of the eye or deterioration of the retina. Sometimes they just want to avoid the stinging and tearing of a day behind the computer. For this purpose, eyeglass manufacturers are preparing glasses that reduce blue light emission from screens, including phones, by 20% to 40%.

“Pregnant woman does not risk”

The famous Afflelou reports that it markets around 50,000 such glasses, which have been dubbed Blue block by the company and cost around €40, each year in France. “With or without the patch, I recommend wearing it for office workers. Even now, after confinement, in the era of remote work, because screens attract our eyes a lot, assures Lionel Avello, Product Manager. Our lenses filter blue light and resist blue light, and their efficacy convinces me.”

The market also welcomes other optometrists such as Krys, Grand Optical or Blueberry, which announce that they have sold 200,000 anti-blue light glasses, with prices starting at 39 euros, since their inception in 2015. And about the same number associated with glass with and without correction. In hindsight on current scientific studies, the company’s founder, Benoit Sordon, admitted that wearing these glasses is “preventive.” He says: “The wearer takes no risk. It can only benefit him.”

Professor Corinne Dutt, Head of the Department of Ophthalmology at the Hospital Desgenettes in Lyon (Rhône), speaks quite similarly: “The studies that have already been carried out are not enough to prove the benefit of this protection, as this member of the French Society of Ophthalmology (SFO) explains . But wearing these glasses does not cause any harmful effects. Therefore, we can recommend it. I wear it myself and feel comfortable thanks to it.”

“misleading marketing”

A position not shared by the Associate Professor of Physics at the University of Grenoble Alpes, Sylvie Zanier. Having studied anti-blue light glasses two years ago with her colleague Julian Delahey, a researcher at the National Center for Scientific Research (CNRS), she considers that some optometrists use “misleading marketing browsing to fear new screens and technologies.” Instead, Sylvie Zanier called on users to use functions already provided by their phones or computers to reduce blue light emissions. Thus, in the settings of the iPhone, under the section on brightness, activating “Night Shift” can play this role.

ANSES (National Agency for Health Security) member, Dina Attia makes a similar observation in other words: “Given the disparity in the effectiveness of protective measures, [nous ne faisons] There is no specific recommendation for its use. On the other hand, she advises to “stop your exposure to LED screens two hours before bed.” In any case, taking regular breaks and reducing screen time are the best recommendations for avoiding long-term vision problems.

Herein lies the broadest agreement among experts. The blue light emitted by the screens disturbs not only the vision, but also the biological rhythm, that is, the awakening of wakefulness and sleep. This is an additional argument in favor of respecting the right to separation, established by law in 2017. Not answering messages from your superiors after 10 pm.It allows you to sleep better …

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