![]() ![]() ![]() Risks and side effects of blue light exposure Researchers point out that because LED devices are relatively new, there aren’t any long-term studies to measure what blue light may do to your eyes over the course of your lifetime. However, it’s difficult to say whether blue light, red light, or infrared light caused this damage because the face mask included all three. One recent exception: Doctors reported that a woman who used an LED face mask to improve her skin had distorted vision and a retinal lesion afterward. While some animal studies have shown that blue light can damage cells in the retina, eye doctors say there is little proof that blue light damages the retina of the human eye. So far, research does not appear to validate the concern about blue light eye damage. Another 15.5 percent used the devices 12 to 14 hours per day - a sizable increase in screen time, probably due to changes in the way people work during the pandemic. This is because people spend so much time using them at such a close range.Ī 2020 study published in the Indian Journal of Ophthalmology found that during COVID-19 lockdowns, for example, 32.4 percent of the study population used a blue-light-emitting device 9 to 11 hours per day. Nevertheless, some eye health experts have expressed concern about exposure to blue light from backlit digital screens and devices. And you’re exposed to a lot of it - the natural blue light from the sun far exceeds the amount from any one device. Those structures don’t keep out blue light. Your cornea and lens protect the light-sensitive retina at the back of your eye from damaging UV rays, for example. As a result of this increased amount of scattering, the dominance of blue light is decreased and so we see an increased amount of white light.Your eye is equipped with structures that protect it from some kinds of light. The Earth's surface also plays a role in scattering and reflecting this light. This is because the light from the horizon has had further to travel through the air and so has been scattered and rescattered. You might also notice that the sky tends to be most vibrant overhead and fades to pale as it reaches the horizon. Why does the blue fade towards the horizon? The blue light that gives the sky its colour, is sufficiently bright to make all the stars that we see at night disappear since the light they emit is much dimmer. This is because there isn't as much violet in sunlight to start with, and our eyes are much more sensitive to blue. You might wonder why the sky doesn't actually look purple since the violet light is scattered even more strongly than blue. Shorter wavelengths (violet and blue) are scattered the most strongly, so more of the blue light is scattered towards our eyes than the other colours. This effect is called Rayleigh scattering, named after Lord Rayleigh who first discovered it. Because these molecules are much smaller than the wavelength of visible light, the amount of scattering depends on the wavelength. When the Sun's light reaches the Earth's atmosphere it is scattered, or deflected, by the tiny molecules of gas (mostly nitrogen and oxygen) in the air. At one end of the spectrum is red light which has the longest wavelength and at the other is blue and violet lights which have a much shorter wavelength. We can think of light as being a wave of energy, and different colours all have a different wavelength. Although light from the Sun looks white, it is really made up of a spectrum of many different colours, as we can see when they are spread out in a rainbow. To understand why the sky is blue, we first need to understand a little bit about light. ![]()
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