Like me, many of you probably get tired eyes after reading online content that consists of dark type against a light, bright background. Personally, I've come to HATE that type of layout for this very reason.

My eyes don't like bright light.
Well, today I learned about a downloadable browser extension (hey, better late than never, eh?)

that you can add to your browser that will convert the format of all the websites that you visit to a dark or night format. Best of all its free.

Its called "Dark Reader".
With my secondary cateracts being affected by bright light, I find that reading light colored type against a dark background is much easier on my eyes.
If you're in the same boat, I'd suggest you give Dark Reader it a try:
https://darkreader.org/