I also use dark mode it's so comfortable on my eyes! On my iPhone I find it bit blinding especially at night in bed.
Glad Samsung has these settings. I will have to try the extra dim and see if it helps more. (Don't think so).
I'm sorry to hear about your eye, I understand I have a bad left eye myself. Sucks doesn't it.
You're welcome, I hope you have a goodnight. Takecare 😊