A study reported in a reputable journal calls into question the effectiveness of anti-blue light glasses, whether for visual fatigue or quality of sleep.
Spending hours in front of screens has become the norm, but the harmful effects of blue light caused by these on our eyes continue to concern us. Opticians have been encouraging the use of blue-blocking glasses for years to prevent eyestrain. A recent study, published in the serious journal Cochranehowever, calls into question their effectiveness.
Glasses that only filter 10 to 25% of blue light
According to this study, notably conducted by Laura Downie, blue light filtering glasses would not present any significant short-term benefit in reducing visual fatigue or improving visual quality. Based on 17 clinical trials conducted in 6 countries, the study suggests that blue light blocking glasses would ultimately only filter 10 to 25% of this light.
For Laura Downie, a professor at the University of Melbourne, no serious evidence of long-term adverse effects on retinal health has been found. However, many opticians claim that these famous glasses would reduce up to 40% of the blue light emitted by the screens.
The study emphasizes the lack of solid evidence regarding the biological mechanisms by which blue light directly causes eye strain. While she points out that longer-term research is needed to reach firm conclusions, she puts the exaggerated perception of the effectiveness of blue-blocking glasses into perspective.
The recommendation of blue light glasses questioned
It is important to note that blue light from the sun remains the greatest source to which humans are exposed. Digital devices only contribute marginally to the total blue light we perceive, amounting to only one thousandth.
Last February, the National Academy of Medicine nevertheless recommended that young people wear blue light glasses for better protection. But the study published on Cochrane Library doubts this recommendation and suggests it is important to consider current evidence before adopting these glasses as a silver bullet for screen-induced eye strain.
The time has not yet come to a consensus on the question. In the absence of glasses, you can otherwise turn to blue light filters.
Source : Cochrane Library
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