[simonebrunozzi]

> 3) THE BIGGEST: The 20/20/20 rule. Every 20 minutes, look at an object 20 feet (6m) for 20 seconds.

What is this suggestion based on?

[geocrasher]

Doing research of my own on the subject. Just google "20/20/20/ rule". I just did, and found the following article. An eye care professional tracked it down and attributed to... another eye care professional.

https://www.optometrytimes.com/view/deconstructing-20-20-20-...