With many hours a day spent in front of computers for work and almost as many hours for entertainment, our eyes are constantly exposed to blue light emitted from screens. As a result, opticians prescribe blue light blocking glasses, but are they really that useful?
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We spend many hours a day in front of our computers smart fonesmart fone For work or for play. as the screens emit the famous blue lightblue lightWhich is sometimes considered harmful to health, even though scientific studies contradict each other on this point, it seems reasonable to protect ourselves against it.
opticiansopticians then propose to apply an anti-blue light filter on it GlassesGlasses glasses to limit the anticipated harmful effects of the latter on fatigue of eyeof eye or sleep But are they really effective or completely useless? A meta-analysis was published in cochrane To address the question, an analysis of the scientific literature on the subject is presented.
a heterogeneous scientific literature
Melbourne University scientists are behind it Review Analyzed results of 17 randomized clinical trials comparing multiple parameters indicative of eye health (visual acuity, CCF or critical threshold) FusionFusion flicker, sensation of brightness…) but also fatigue and sleep quality between two groups of volunteers: those with anti-blue light filter glasses and those without blue light filters.
This set of studies is very heterogeneous in terms of the number of volunteers involved (from one person to 156), their health status (from those in good health to those suffering from mental or sleep disorders); and from DurationDuration their follow-up (from one to five weeks). Most analyzes provide qualitative results, not quantitative results, which leads to many biases. However, scientists have drawn some conclusions.
Are blue light glasses useless?
According to these 17 studies, blue light-blocking glasses do not reduce eye fatigue or increase vision quality. On sleep, the studies contradict each other: six of them suggest that glasses with blue light filters improve sleep quality, three others show no benefit.
Worse yet, some studies suggest that wearing glasses that block blue light can cause migraines, discomfort (some filters modify it). colour’scolour’s), and even mood disorders; Adverse effects that have not been observed for conventional glasses.
So, are we dealing with a scam? it Review Sounds harmful and suggests that glasses that block blue light have no positive effect on our vision, but the many biases compiled in the studies urge caution. Better quality clinical trials will be needed to confirm this first finding.