New Delhi, Nov. 12 -- Up late scrolling through your phone or laptop and notice that comforting yellow glow on your screen? That's a blue light reduction filter. This feature is now nearly universal across devices and designed to make evening use easier on your eyes. If you haven't used it, try it from your 'Display' settings today. But is this warm tint more than just a comfort setting and does it really help?

On Apple devices, you'll find this option labelled as Night Shift on iPhones and Macs. It gradually shifts the colour temperature of your display towards warmer hues after sunset. Windows laptops also offer Night Light which is a setting that can be scheduled or triggered manually. On Android, it is typically called the Blue Light...