I have computer glasses that have a prescription specifically for computer distance. If I don't have those, I can still work, but I will have headaches that day

I have computer glasses that have a prescription specifically for computer distance. If I don't have those, I can still work, but I will have headaches that day and be less productive. (I'm quite nearsighted normally and wear transition bifocals to see in the distance, but they're not well suited for looking at a computer). And then about once an hour or so I get up and walk around, preferably outside and look up at the sky for a few minutes (focusing on a different distance). You could even just focus on a far wall or something instead, but I prefer nature. I've read that that helps once somewhere and it does seem to help for me.