Particularly, when using the display for work, you'll often be comparing paper documents with documents on the screen, so by adjusting the brightness of the screen to the brightness of the paper under the lighting, you'll reduce the strain on your eyes, making this an effective measure against eye fatigue.

Is a dim screen bad for your eyes?

Watching Television in the Dark

Eye Smart notes that playing video games or viewing TV in low light is unlikely to cause any actual damage to your eyes, but the high contrast between a bright screen and dark surroundings may cause eyestrain or fatigue that could lead to a headache.

Does lowering brightness help eyes?

Adjusting the display settings of your computer can help reduce eye strain and fatigue. Generally, these adjustments are beneficial: Brightness: Adjust the brightness of the display so it's approximately the same as the brightness of your surrounding workstation.