Do you long for the days of the WarGames-era VDT with the black screen and green type? Or do you just hate the glare of a bright white display? Are you coping with vision difficulties? If so,  your apps and operating system and some of your programs might include settings that make it easier on your eyes.

For example, If you don’t want to flip your whole operating system around, you can often find a dark or night mode setting in many apps — like Microsoft Edge, Twitter for Android and iOS, the Amazon Kindle and Apple’s own iBooks app, and some apps like Waze and Google Maps might flip to the night mode automatically, depending on the time of day. YouTube’s desktop site just added a dark mode, too.

But if you want things more consistently less glaring, Windows 10 has a Dark Mode available in the Settings app, as well as a High Contrast Mode in the Ease of Access controls. Dark Mode doesn’t make everything dark, mainly just the background of certain apps and system screens, but the High Contrast Mode flips the background and changes the colors of several kinds of screen type to make everything stand out better for those who have trouble discerning different tints. Apple’s System Preferences for macOS has similar controls in the Display area of the Accessibility settings.

And don’t worry — if you get tired of dark mode, you can always come back to the light.