The TL;DR is that high contrast between background and text colors ... Examples include contrasting light grey versus middle grey, middle pastels versus darks, or white versus light cyan (blue-green).

This is often called night mode or dark mode. It changes the background from white to black. Install blue light-filtering apps on smartphones, tablets, and computer screens. They filter a lot of ...

The green color is produced by atmospheric refraction of light, which causes objects near the horizon to appear slightly higher in the sky than they really are. Refraction is stronger for blue and ...