From Chris Adams,
Your Guide to Ergonomics.
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Ergonomically speaking, you should take a 10-minute break every hour you're working to prevent fatigue and repetitive stress injuries. You should get up, walk around and stretch. The reality is, however, that you may have less time to cram this in -- and that time may be spent running off to another task. Here is a set of 10 essential stretches that you can do during your elevator ride, on the way to the parking lot, while on the phone or any time you can find two minutes.

Eye strain can easily be relieved. One way to relax the eye is to stretch the muscles that focus the lens. The key is to focus on things at different distances. You can follow your finger if nothing else will do.

• Focus near, then far, near, then far.
  
• Repeat a couple of times.
  
• Take a couple of long blinks.
  

More on Eye Strain

• How to Relieve Eye Stain
• Tips to Prevent Eye Strain