Protect your Eyes, the FOSS way! ;-)

When we live most of our lives in front of screens, they bring us a lot of 'occupational hazards':
Our eyes, wrists and backbones are the most affected.
And that is where the importance of good ergonomic practices come into being.
There have been a lot of innovative solutions devised around it, and here are two to protect your eyes:

SafeEyes - https://itsfoss.com/reduce-computer-eye-strain-linux/

F.lux (flux), RedShift (a better alternative to flux) and Twilight (for your phones) - https://itsfoss.com/night-shift-flux-ubuntu-linux/

More about Redshift:
https://www.maketecheasier.com/protect-eyes-redshift-linux/