But there are also other uses for dark mode that antecede Apple’s OS – photo or video editing programs, where you need a neutral background, and early monitors that often had a green-on-black look. Over at WIRED US, Paris Martineau argues that the first modern operating system to offer it was probably Apple’s System 7 OS, which debuted in 1991. Like the science behind it, the history of dark mode is mired in confusion. Yet there is contrasting evidence that if you are reading large amounts text, black on a white background is easier on the eye. According to Silas Brown, a partially-sighted computer scientist from the University of Cambridge, looking at a dark backgrounds does reduce video glare and eye fatigue. Regarding the latter claim, the scientific evidence leaves a lot of questions unresolved.

And, even more crucially, dark mode cuts the amount of light flooding into your peepers, reducing eye strain and perhaps making it easier for you to get to sleep. First, the device uses less light and so consumes less battery or electricity. The benefits of dark mode, acolytes say, are twofold.

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