I had a conversation with my eye doctor a few years back about computer screens and brightness.
He said, that whole thing about blue light being damaging to your eyes? Not true. At least if we're talking about electronic screens.
According to my doctor, and I fully recommend this myself, is to set the brightness of your screen properly in the environment they're in.
Easiest way to do that is to adjust the amount of light in the room to your liking. Turn the brightness on your screen(s) all the way down. Slowly turn the brightness up until black text on white background is easy and comfortable to read.

Tl;dr
Lower the brightness on your screens to save your eyes from strain.