The science of light is amazing. There is visible light and there is light you\u00a0don\u2019t\u00a0see, like the UVA and UVB light from the sun that causes\u00a0sunburn\u00a0and other forms of serious damage to your health. Then there are the light rays you\u00a0do\u00a0see that come from the sun and also emanate from most digital devices, including your smartphone.\r\nWhen you look at a chart about the sun\u2019s damaging UVA and UVB rays, you\u2019ll see that their wavelengths range from 100 nm to 400 nm (\u201cnm\u201d stands for nanometer, which is a measurement of length). Next on the spectrum is blue light, whose wavelength ranges from 380 nm to 500 nm. (The entire light spectrum goes up to 700 nm.) The blue light portion is what emanates from digital devices, such as computers, flat screen TVs, fluorescent light bulbs, and smartphones.\r\nEvolving research has shown that blue light can be bad for skin. It\u2019s certain that blue light in the 380\u2013400 nm range is problematic, although the risk seems to lessen somewhat toward the top end at 500 nm. Long-term exposure to concentrated blue light energy can cause skin damage, including color changes, inflammation, and weakening of the skin\u2019s surface. Simply put, blue light promotes stressors in skin that cause photo-aging; that is, aging from exposure to light.\r\nWithout question, sunlight is the main source of blue light to which we are exposed; digital devices emit only a fraction of that amount of radiation. However, our phones are much closer to us than the sun, and this \u201cclose-up\u201d exposure matters. We spend so much time using our devices, holding them close to our face and eyes, it adds up\u2014that\u2019s where health issues arise. Statistics show that millennials check their smartphones 157 times per day, in comparison to older adults, who check their phones only about 30 times per day. That means millennials are at a much higher risk of blue light exposure\u00a0each and every day.\r\nWhen it comes to the eyes, there\u2019s far more research indicating how damaging unprotected exposure to blue light can be. The research into blue light damage to the skin is less conclusive, however, because while there is research showing it hurts skin, there\u2019s also research showing it helps; for example, blue light is an effective therapy for certain skin disorders. Confusing, yes, but research can be that way.\r\nOur strong recommendation is to cover your phone with a blue light screen shield (amazon.com has plenty of options). It\u2019s a cheap fix and it eliminates the need to worry about skincare or sunglasses when using your phone or tablet (if only it were that easy for your skin and the sun). Some smart phones have a setting that disables blue light in favor of yellow light (often called night mode or nightshift) which is far easier on the eyes\u2014and, in turn, your skin. If your phone has this feature using it all the time can be a great anti-aging and eye saving thing to do.\r\nWhether it\u2019s the light from sun exposure or from your smartphone, without question, you need to protect your eyes during the day. Polarized sunglasses are essential for all outside light exposure to prevent long-term damage as well as damage from your phone (although we realize it\u2019s not practical to wear sunglasses inside). If you don\u2019t have a blue light screen shield, viewing your smartphone at arm\u2019s length will help.\r\nUnless your doctor prescribes a blue light facial treatment, you also need to\u00a0protect your skin\u00a0from the potential damage due to exposure to blue light. In addition to a blue light blocker (obviously we\u2019re keen for you to get that now) on your smartphone screen,\u00a0sunscreens\u00a0and\u00a0products loaded with antioxidants\u00a0are the research-supported options for diminishing the negative effects of blue light on skin. If you\u2019re already using those types of products, that\u2019s one more problem solved!