What is that? You ask.
One of the most important rules for vision improvement and for keeping back pain away.
It basically says this:
Every 20 minutes. (25 if you work according to the Pomodoro method.)
Get up from your chair. Walk to a window.
20 second at least stare to the distance of at least-
20 ft which is 6 meters.
That's it.
Give your eyes a rest from screens and from looking at a close distance.
Do that and reduce becoming myopic.
Want me to do a post about the benefits of the Pomodoro method?