Bad habits when sitting at a computer cause eye strain (collected by Mr. Hao Chen)


Bad habits when sitting at a computer causes eyestrain
When working with computers, remember rules 20x4 (20-20-20-20): keep your eyes from the screen at least 20 inches (50 cm) and rest your eyes for 20 seconds after 20 minutes of work by looking at a distant object at least 20 feet (6 m).
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Lan Lan, according Allaboutvision.com