It signals your brain to wake up when it should be winding down. The blue light from electronic devices messes with your circadian rhythm, or sleep cycle. Screen time, especially at night, is linked to poor sleep. Symptoms include dry, irritated eyes and blurred vision. More research is needed.Įxperts think digital eyestrain, or computer vision syndrome, affects about 50% of computer users. That’s raised concerns about whether blue light from digital screens is harmful. In large amounts, high-energy light from the sun - like ultraviolet rays and blue light - can boost your risk of eye disease. Most of the light from the LEDs used in smartphones, TVs, and tablets has wavelengths between 400 and 490 nanometers. Some research shows a link between eye damage and short-wave blue light with wavelengths between 415 and 455 nanometers. Blue light has shorter wavelengths and higher energy than other colors. Fluorescent and LED (light-emitting diode) light bulbs also give off blue light.Įach color in the visible light spectrum has a different wavelength and energy level. Together, they make the white light you see when the sun - the main source of blue light - is shining.

You may know them by the acronym ROY G BIV. It’s one of several colors in the visible light spectrum. Blue light from electronics is linked to problems like blurry vision, eyestrain, dry eye, macular degeneration, and cataracts. It’s safe to say most of us spend a lot of time staring at screens.

Sfilter vs night screen