If you are often looking into your screen well into the evening (who isn’t?) you might want to try f.lux, which adjusts the brightness (or more accurately, the color temperature) of your screen based on the time of day, making life a whole lot easier for your eyes. Disabling f.lux, will return your screen to its normal calibration. I have tried f.lux myself and while it’s hard to judge objectively whether or not it really makes things easier on your eyes, I do know that after a long day looking into my screen they are fatigued so I figure they can use all the help they can get.
Automatic Screen Brightness Adjustment
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