We talk more and more about the blue light emitted by some LEDs. Generally, in a somewhat negative way. Moreover, that is once again the case today. Researchers tell us how it damages our retina.
Remember that to see; we need photoreceptor cells in full shape. Also, to keep them in shape and to correctly perceive the light that reaches our eyes, they need a supply of molecules called retinal (C20H28O).
Blue and retinal light
However, according to American researchers, it is these same molecules that, exposed to blue light, end up blind us. They trigger reactions that produce killer molecules of photoreceptor cells. So once dead, the photoreceptor cells, unfortunately, do not regenerate.
Today, researchers advise us to protect our eyes by equipping ourselves with glasses capable of filtering blue light. Or not to use smartphones or tablets in the dark. Until a solution is found to block the toxic chemical reaction, they’ve uncovered.
Are LEDs dangerous for the eyes?
A study by Inserm raises the question of the dangers of LED bulbs for vision. In rats, some of the LED wavelengths are toxic to the retina in a mechanism that may promote age-related macular degeneration (AMD).
However, in the absence of pupil dilation, albino rats exposed to long-term LED light (continuously for a week or a month) also show retinal degeneration. So even non-albino rats, known to be protected from photo-induced degeneration, show signs of oxidative stress in their retinas.
Blue LED light is toxic to the retina
Behind the phototoxicity of LED bulbs, a culprit: blue light. Each light source – LED, fluorescent tubes or compact fluorescent bulbs – combines different colors in varying proportions. Also, the potential toxicity of each of them on the retina depends on both the intensity of the light and the wavelengths that compose it.
Although it is probable that the observations made in rats are not transposable as they are in humans, the data from this study are questionable. As a precautionary principle, these data call for the next generation of domestic light bulbs, in which we would reduce the proportion of blue light.
Beware of LED lighting
Some diode lighting lamps, or LEDs, would pose a risk to the eyes, especially children.
Light-emitting diodes (LEDs) are increasingly present on the spokes. Designated as ideal due to their low consumption, they multiply in homes or workplaces and flourish in car headlights. However, their light differs quite significantly from other types of lighting, and the usual standards do not suit them.
Its conclusions published in a report cast a shadow on this contemporary lighting, which would not be without risk. The study: wavelength and luminance note two main effects. Diode lights emit a significant proportion of blue light, i.e., short wavelengths.