system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Do mirrors make our eyes focus further away?

The 20/20/20 rule can help reduce stress on your eyes when looking at screens: every twenty minutes, look at something twenty feet away for twenty seconds. This is supposed to help keep the eyes from being overly injured from staring at a close screen. 
However, if I look in a mirror that’s 5 feet away and at the wall 10 feet behind me, would that count as looking twenty feet away? Would me eyes be focusing the equivalent of twenty feet, or would that only really be five feet?
gpt
Your eyes are focussing on the virtual image which is 15 feet beyond the mirror, so yes you are correct.

I’d suggest physically moving though, even if that just means turning your head. That will cause you to adjust your posture etc.