I'm a programmer with pretty bad astigmatism, and didn't go to an eye doctor until my late twenties. I had never worn glasses before that, and had no idea how fucked my vision was.

Yet, I still have no problem writing code in dark mode without glasses. Even though the text is blurry, I've gotten used to it. I squint a lot, and idk if there are any negative consequences from doing that, but glasses tend to tire out my eyes faster, so I sometimes prefer the blurriness.

Some of us just got used to it before cheap monitors could show black letters on a white background.