What if the Blue Block glasses, really, were useless?

Many are the hours we spend watching a screen, be it the computer we work with, the TV or our mobile. And as you can see, the eyes do not come out unharmed from this long exposure. Some say that the blue light emitted by these electronic devices damages our eyesight. And that's where the 'Blue Block' glasses come in, created to protect our eyes from such emission. Some lenses that have become popular in recent years and that are around, depending on the brand and graduation, 150 euros.

And you may have asked yourself: are they useful? Do they really block the blue light as your name promises? Well, we anticipate that no.

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Blue light does not affect the eyes

That's how blunt they announce from the Spanish Ophthalmology Association, claiming that there is no research to prove that the blue light that gives off the daily use of the screens is harmful. And, as they cite in a study carried out by Dr. Celia Vimont and reviewed by Dr. Khurana, spokesman for the American Academy of Ophthalmology: "The discomforts that some experience after being looking too long screens are probably due to digital eye strain. Almost all of us blink less when we are watching the screens, causing tiredness and dry eyes. "

And it is that this type of light – which is also released by the sun itself – enters our eyes naturally, as experts say. The blue light only affects them and our skin superficially, but "it cannot have any effect on any deep part of the body."

And then, what are the 'Blue Block' glasses for?

Knowing that it has not been possible to demonstrate the negative influence of blue light on our vision, it is inevitable to ask what are the use of these lenses that supposedly block it. To get out of doubt we have asked Dr. José Lamarca, from the Barraquer Ophthalmology Center and a member of Doctoralia. "There is no consistent scientific literature that demonstrates the usefulness of filters," he says. "However, we know that the blue light emitted by the LED screens of our devices can alter our circadian rhythms related to sleep, and for this reason we could think about their use".

That is to say: it can be thought that glasses could help us prevent sleep disturbances, but in terms of blocking blue light, they are useless. Therefore, is it worth investing in them? We cannot say that they are a necessity, that is clear. There it depends on the decision of each one. What we can say is that it is not harmful to use them either: "If its use improves the symptomatology there is no problem," says the expert.