So I was trying to look at some of the specs on my LG monitor on Vanns.com and noticed that it had a feature based on a 20 20 20 Rule which I have never heard about before. Basically Ergonomics experts Reccomend that every 20 minutes you look at something 20 feet away for 20 seconds. So I thought this was a cool feature, however I could not anything about 20 minutes, I only found a timer for an hour on it. However Feature or not, Try to use this rule if you stare at a computer screen a lot like I do!
It is an Interesting concept, I never heard of that, but can you really keep track every 20 minutes? I heard something similar on http://www.eyestrainfromcomputers.com which mentions every 20 minutes take a 5 minute break or every hour take a 20 minute break.