My own theme preference strongly reflects the fact that I’m colorblind (and like OLED dark modes). I use Dieci on my iPhone and Panic Mode on macOS. Some of the syntax highlighting within codeblocks has been less-than-ideal, but other than that, I’ve liked the contrast and visibility best of the different dark mode themes. When you offer so many great themes, it’s reasonable for someone color blind to make sure to pick one that works well with their particular colorblindness. I haven’t gone through and spent a lot of time on each theme, but none jumped out at me as inaccessible.
That said, it’s an easy line to cross without realizing it. Instapaper’s OLED dark mode makes the link color TOTALLY imperceptible to me. The rest of their modes are fine, but I so prefer OLED dark mode that I find it to be a real issue personally. The current distinction in Panda’s dark theme is readable, but comes off as a bit more subtle than ideal IMO. Will enjoy testing it with my regular themes when they become usable in the testing process.