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A small 2015 study found that when people are exposed to blue light in the evening hours, their bodies don’t release as much melatonin, and their sleep cycles are delayed or disrupted. Squinting at screens for long periods isn’t recommended for the overall health of your eyes. If you wear prescription eyeglasses to correct your vision, make sure you’re wearing a prescription intended for the distance between your eyes and your screen — ideally an arm’s length away. Most glasses are formulated for longer distances. Adjust the blue light on your screen AMA adopts guidance to reduce harm from high intensity street lights". American Medical Association . Retrieved 2020-01-29.
You can damage a retina if you point strong blue light at it for long enough, which is why we don’t look directly at the Sun or LED torches. Why is blue light used by some doctors? In large amounts, high-energy light from the sun -- like ultraviolet rays and blue light -- can raise your risk of eye disease. That’s caused concerns about whether blue light from digital screens is harmful. More research is needed. Blue light filters reduce the amount of HEV blue light emitted from these devices from reaching your eyes without affecting the visibility of the display. Some are made with thin tempered glass that also protects your device's screen from scratches.LEDs & blue light | Anses - Agence Nationale de sécurité Sanitaire de l'alimentation, de l'environnement et du travail". www.anses.fr. 13 August 2019 . Retrieved 2020-01-29.
Ham, William T.; Mueller, Harold A.; Sliney, David H. (11 March 1976). "Retinal sensitivity to damage from short wavelength light". Nature. 260 (5547): 153–155. Bibcode: 1976Natur.260..153H. doi: 10.1038/260153a0. PMID 815821. S2CID 4283242. Garcia-Saenz A, et al. (2018). Evaluating the association between artificial light-at-night exposure and breast and prostate cancer risk in Spain (MCC-Spain Study).
Do blue light filters or blue light glasses help sleep?
Blue light from sunlight is very important in regulating circadian rhythm — our natural wakefulness and sleep cycle. Exposure to blue light from the sun during daytime hours helps maintain a healthy circadian rhythm. Blue light filters and protective eyewear Still, there isn’t much research to confirm that blue light directly leads to eyestrain. More high quality studies are needed. Blue light and sleep
Driller MW, et al. (2019). Hunger hormone and sleep responses to the built-in blue-light filter on an electronic device: a pilot study. While light of any kind can suppress the secretion of melatonin, blue light at night does so more powerfully. Harvard researchers and their colleagues conducted an experiment comparing the effects of 6.5 hours of exposure to blue light to exposure to green light of comparable brightness. The blue light suppressed melatonin for about twice as long as the green light and shifted circadian rhythms by twice as much (3 hours vs. 1.5 hours). Each color in the visible light spectrum has a different wavelength and energy level. Blue light has shorter wavelengths and higher energy than other colors. Some research shows a link between eye damage and short-wave blue light with wavelengths between 415 and 455 nanometers. Most of the light from the LEDs used in smartphones, TVs, and tablets has wavelengths between 400 and 490 nanometers. Blue Lights cast members Siân Brooke, John Lynch, Martin McCann, Valene Kane, Katherine Devlin, Jonathan Harden, Nathan Braniff and Richard Dormer Every writer wants to explore their own place, and their own society as authentically and as honestly as they can. We feel enormously grateful to BBC drama for letting us do that with Blue Lights. And to do it with a cast boasting so much new and established talent makes it even more exciting. — Declan Lawn and Adam Patterson In 2017, researchers at the University of Haifa, Israel, found that exposure to blue light in the evening, on average, reduced duration of sleep by 16 minutes. It also reduced production of melatonin, a hormone that influences the circadian rhythm.
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We’ve long known that our visual photoreceptors, known as rods (for night sight) and cones (for bright light and colour) do this to some extent. But only in the 21st Century did we discover that we also have photosensitive retinal ganglion cells, which act as light meters that set our circadian responses. These are particularly sensitive to blue light. Other frequencies on the visual light spectrum can, even without blue light, trigger the circadian system (the brighter the light, the greater the effect), but not as readily. Blue light has also been used to effectively treat inflammatory skin conditions, such as psoriasis and atopic dermatitis. Conventional UV light therapy comes with increased risks of skin cancer and skin ageing, but studies now imply that high-energy blue light has a similar dampening effect on the skin’s immune response, reducing inflammation without the side effects. Do blue light glasses work? There couldn’t be anything more ordinary than blue light. It’s the reason the sky looks blue – because it bounces off the molecules in the Earth’s atmosphere more readily than the rest of the visible light spectrum. Modenese, Alberto; Gobba, Fabriziomaria (September 6, 2018). "Macular degeneration and occupational risk factors: a systematic review". International Archives of Occupational and Environmental Health. 92 (1): 1–11. doi: 10.1007/s00420-018-1355-y. PMC 6323067. PMID 30191305.
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