"Special photoreceptors in the eye detect light to control our circadian rhythms," he says. The 24-hour circadian clock in the brain regulates sleep and wake cycles, hormonal activity, eating and digesting, and other important processes within the body. Steven Lockley, a neuroscientist at the Division of Sleep and Circadian Disorders at Harvard-affiliated Brigham and Women's Hospital. In addition to helping us see, light also has nonvisual effects on the body, says Dr. And different slices of blue-light wavelengths have different effects on our bodies, including on sleep and alertness. Blue-light wavelengths lie between about 450 and 495 nm. Measured in nanometers (nm), visible light wavelengths range from 400 to 700 nm. Sunlight has a lot of light at all visible wavelengths. At one end of this rainbow, blue light shades toward violet. You may remember looking through a prism to bend the wavelengths that make up white light into a rainbow of colors. Together, the wavelengths of visible light captured by our eyes are translated into white light by our brains. Visible light includes a short segment of wavelengths tucked into the electromagnetic radiation spectrum. So I was intrigued, but a little skeptical: could daytime use of blue light-filtering glasses make a difference in how well he slept? How, when, and why blue light affects us seemed like good questions to pose to an expert before deciding whether those glasses could help me, too.
He wears his glasses mostly for reading screens (both computer and smartphone) during the day while at work. Recently, my brother mentioned he was sleeping better since he got new prescription glasses with a blue-light filter.
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