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Eyestrain occurs due to bad lighting and staring at one object, such as your computer screen, for too long a period. To reduce eye strain, focus on an object that is at least 20 feet away for 5-10 seconds every 30 minutes. Another way to reduce eyestrain is to close and gently rub your eyes every half hour.
See the section on Lighting for more information and the Eye Relaxer for related exercises.