![]() The science is inconclusive so far, but hopefully additional studies will shed light on the theory. Some studies have hinted that the effects can be even stronger among people with darker skin, as the “blue light” can cause hyper-pigmentation and skin darkening. Recent studies have shown that this “blue light” (otherwise known as high-energy visible light or HEV for short) emitted by electronic devices could potentially be just as damaging as sun exposure. But most televisions, computers, smartphones and tablets emit other types of light that some studies show can be harmful to your skin with prolonged exposure. Generally, newer model computers feature LCD or LED screens and do not emit harmful UV radiation. But what about other types of light, like the warm glow of a computer monitor or smartphone? doi:10.1210/jc.You probably know that UV rays emitted by the sun can be damaging to your skin. The Journal of Clinical Endocrinology & Metabolism. Exposure to room light before bedtime suppresses melatonin onset and shortens melatonin duration in humans. Gooley JJ, Chamberlain K, Smith KA, et al. Published online April 1, 2022.Ĭleveland Clinic. Science with a smartphone: Measure light with lux. The efficacy of light therapy in the treatment of mood disorders: A review and meta-analysis of the evidence. Published online March 11, 2022.Ĭleveland Clinic. Can you change your circadian rhythm? Sleep Foundation. Effects of light on human circadian rhythms, sleep and mood. Light-induced melatonin suppression at night after exposure to different wavelength composition of morning light. Kozaki T, Kubokawa A, Taketomi R, Hatae K. Morning and evening blue-enriched light exposure alters metabolic function in normal weight adults. doi:10.1038/sj.eye.6702597Ĭheung IN, Zee PC, Shalman D, Malkani RG, Kang J, Reid KJ. Light, dark, and melatonin: Emerging evidence for the importance of melatonin in ocular physiology. Stability, precision, and near-24-hour period of the human circadian pacemaker. Effects of light on circadian rhythms.Ĭzeisler CA, Duffy JF, Shanahan TL, et al. This delays your ability to fall asleep and may impact your desire to wake in the morning.Ĭenters for Disease Control and Prevention. There is evidence that exposure to light at night could shift your desire for sleep by about 90 minutes. The Timing of Light: One of the most important variables is when you are exposed to light, including from natural and artificial sources.Digital screen filters, blue light blocking glasses, and prescription glasses with FL-41 tint are sold to block this blue light wavelength to minimize disruption to our circadian rhythms. Full-spectrum light, what you might consider as “white light” or “natural light,” contains the blue wavelengths as well. The Color of Light: Much is made of the fact that blue light is responsible for shifting circadian rhythms, while red, yellow, and orange light waves do not have this effect.Even smaller amounts of light, such as from a smart phone that is held 12 inches from our face before going to sleep, may have a negative impact on our sleep. Using lux helps us understand how nearby screens may have more impact on us than the same screen from across a room. (A unit of lux describes how much light falls on a certain area whereas a unit of lumens tells you the total amount of light emitted by the light source). ![]() For comparison, full sunlight at midday may be 100,000 lux, whereas commercially available light boxes that are used to treat seasonal affective disorder often generate about 10,000 lux, and the screen of your smartphone may create hundreds of lux of light intensity, depending on the settings you use. ![]()
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