Recently switched to a custom made light theme for Vim, after reading a bit on how dark themes aren't all that good for your eyes.

Oh boy it makes a positive difference. Probably also helps that I reduced the amount of colors used, compared to my previous theme.

This is my new theme in question: https://gitlab.com/yorickpeterse/vim-paper

Also quite happy with how FZF floating windows look in this setup.

One big difference is the complete absence of halation in this theme.

My old theme suffered from this a bit, especially as my eyes got tired. In fact, I had my eyes checked out years ago because of that; only to recently learn the issue was likely halation, not my eyes.