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In page Computer vision syndrome:

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Computer workers are often advised to take breaks and look at distant objects.[1] A routinely recommended approach is to consciously blink the eyes every now and then to help replenish the tear film and to look out the window to a distant object or to the sky—doing so provides rest to the ciliary muscles.[2] An example of a common catchphrase is the "20–20–20 rule":[3] every 20 minutes, focus the eyes on an object 20 feet (approximately 6 meters) away for 20 seconds. This gives a convenient distance and timeframe for a person to follow advice from an optometrist or ophthalmologist.[citation needed]