> So, the thing that I need help with is this: I frequently work late
> and for  long time, so I need to rest my eyes a little. That's why I
> used some tools before to invert the colors of the screen.

Inverting the screen colors isn't something I've done before, but here's
my approach to minimizing eye strain:

I find a high-color-contrast low-brightness-contrast color theme like
Solarized or (my preference) Zenburn to be easier on the eyes than
bright white text on a dark black background (which is probably
approximately what you get when inverting everything), based on how much
pain I feel when looking at a screen while I have a headache or am
working late at night.  I don't know anything about the science of this,
but my best guess is that different brightnesses require different
amounts of pupil dilation, so keeping everything at around the same
brightness and instead relying on color contrast to tell objects apart
causes less train.  I don't know though.  I've just observed what
is/isn't painful for me.

I use Numix-Zenburn[1] as my GTK theme, use this Zenburn vim theme,[2]
have set mate-terminal to use a Zenburn colors, and have modified
Abrowser/Icecat color preferences to strip out background images, use
Zenburn's background color for all webpages, Zenburn's blue shade for
links, and Zenburn's white for all other text.  With all this,
everything on my screen is easily readable, and always at a constant and
pretty low level of brightness, which I find pretty easy to work with.

[1] https://github.com/williamkray/Numix-Zenburn

[2] https://github.com/jnurmine/Zenburn

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