Flux actually hurts my eyes?



  • I wasn't sure where to post this and I couldn't find anything by searching online for the same problem. When I have flux turned on, my eyes get very dry and tired and it's hard for me to see clearly. With it off I have absolutely no problems. On my iPhone when night mode is turned on I have no issues with it like I do on my computer.

    Could this be a color issue with my monitor or something?



  • I think it's the difference in size between the displays. On the phone, it's just a small display and you still see a lot around the phone (outside of the display). With the computer monitor, it's not quite like that because the display is bigger.

    Perhaps your computer monitor's brightness setting is too low, or your room lighting isn't bright enough - or a combination of both.


  • f.lux team

    You could try changing the settings. It's hard to say more without knowing what you're dialed in at, but the common sense answer is that if something hurts your eyes you should probably stop using it.



  • I've tried all three settings 3400-5000k, 3400 is the worst. I think it has to be something with my monitor because I've never had this issue with any previous monitor.

    Should I be setting my monitor brightness at high and set flux low do its thing or set it low and set flux high? what's an ideal setting?



  • @suosuo If you're monitor is adjusting it's brightness when you enable f.lux and your screen has "pulse width modulation" or PWM backlighting, then it may be the cause.

    If you could open your monitor menu and go to the info section and let us know your model we can all search it for PWM. That would be the first step I think. Another thing is, how old is your monitor, if it's got cold cathode fluorescent lamps, and they're five or six years old, then it's time for a new monitor.



  • @suosuo Turn down your monitor brightness well below 50%. Wave your hand in front of the screen. If you see a chop in the movement, then it is indeed PWM, modulating the speed at which the backlight "pulses" pure on, to pure off, with minimal fade in the backlight. The absence of a fading, is what causes a chop, that direct, near instant darkness in the screen, then right back to 100% brightness--this pulsing gives the illusion that it's not at full brightness but it still is. Be sure to look for "Flicker Free" monitors!


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