Eye strain from long periods on a screen

One way or another, many of us are using various devices and screens for many hours of the day through working from home or in our leisure time. Spending long periods looking at computer, phone, or tablet screens can strain the eyes. Using the 20-20-20 rule can help to prevent this problem.

The rule says that for every 20 minutes spent looking at a screen, a person should look at something 20 feet away for 20 seconds. Read more:
https://www.medicalnewstoday.com/articles/321536