Why is this being downvoted? Doesn't it make sense that senior developers spend more time sending emails than staying up through the night writing code?
Dual monitors are so 2000's. It's all about the single large ultra-wide monitor now. You get the benefits of a dual monitor setup without the line in the middle and the RSI neck pain issues.
I bought an ultra wide at the beginning of COVID and when I started my new job, my employer gave me another one. Now I have two side by side (the newer one is in the middle) and my laptop to the side. Sometimes I struggle to open enough applications to fill all that space.
My homeoffice setup is right next to a window, so it's too bright for dark mode during the summer. So I work in light mode from about April-September and in dark mode for the rest of the year
Used dark (not black) themes everywhere for 8 years. My eyesight is still good according to my annual physical, but recently I've noticed that I have a hard time reading text written on a dark background. It is slightly blurred, especially when there is no light in the room.
Somewhere I still use dark themes, but I always try to switch to light mode if things look okay with code highlighting or smth.
If so you should really have a check up with an eye doctor, there are lots of eye health tests that you should regularly get beyond checking that you can read a chart at a distance.