Updated Feb. 18 at 2:30 p.m.: This article was updated with comments from Warby Parker. Increases in screen time since the beginning of the COVID-19 pandemic have surfaced new concerns about blue light and its potential impacts on sleep and eye health. Cross-sectional and self-reported data from a sample of 3052 U.S. adults showed clinically meaningful increases in screen time in those considered “active” or “inactive” prior to the pandemic. LEDs, or light emitting diodes, in televisions, tablets, cell phones and computers emit light that peaks in the blue light range. Among all the colors on the visible light spectrum, blue light contains more energy compared to other colors, like red or orange.