[kakarot]

If you have dim lighting, you can cause eye strain, and in extreme cases actual eye damage, by having small points of bright light in your vision like a phone or computer monitor because your pupils will be more relaxed.

Even now with the benefits of warmer color temperatures becoming mainstream knowledge, most people still use blindingly bright screens with high color temperatures, which causes more eye strain.

Also when you're staring at a monitor for 8-12 hours a day, it becomes less about readability and more about comfort. That's why most programmers prefer dark themes.