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The thing with backlit screens is that you need to adjust them to match ambient lighting conditions (or vice versa). If you read them in the dark you need to dial down the brightness, or even change the color scheme so they throw less light (white text on black background etc.). Of course if the display can't be adjusted enough, and you can't change the color scheme, the only recourse may be to turn on some external lighting, or go to sleep.
Apple has figured this out, so that their laptops (and iPad) have light sensors that automatically adjust the brightness level of the screen. OSX also has a hotkey to change the toggle the color scheme from 'black on white' to 'white on black' (colors get remapped to some complementary value). There's probably some software that lets you do something similar on Windows.
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