This is worth considering in the context of driving at night.

I used to get terrible eye strain, causing fatigue and sleepiness. Obviously not good.

Then I bought a Saab 900. It had a 'night mode' that disabled all dials except the speedo. The lights went off and the dial went down. (It came back on if it needed to alert you of something, say low fuel.) [0]

This made a radical difference, and led me to the dash-brightness dial that nobody ever touches. Turns out if you turn that way down, reducing the contrast between you and the road, it's actually enough to get you 90% there. Because you probably don't drive a 1992 Saab (more's the pity).

[0]: https://www.youtube.com/watch?v=KIfzUqYEkiw