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Does the 20-20-20 rule prevent eye strain?

Does the 20-20-20 rule prevent eye strain?

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. Following the rule is a great […]