IBM Aptiva Handbook page 16

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Place the monitor at a comfortable viewing distance.
You can also use the length of your arm to determine a
comfortable viewing distance.
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Adjust your monitor so the top of the screen is at, or
slightly below, eye level.
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Keep the screen clean. For cleaning instructions, refer
to the documentation that came with your monitor.
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If you place the monitor near window, consider using
curtains or blinds to minimize glare from sunlight. Also
be sure to keep the monitor perpendicular to the
windows to reduce glare when the curtains or blinds are
open. Try to avoid placing the monitor directly in front of
a window.
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Use dim room lighting. If you need more light on your
work, you should position the light so it shines on your
work surface but not onto the monitor screen.
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Use the monitor controls to adjust the screen's
brightness and contrast levels to a comfortable level.
You may have to do this more than once a day if the light
in the room changes. For monitor control adjustment
instructions, refer to the documentation that came with
your monitor.
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When your eyes focus on a specific object for a long
period of time, they may become tired. If you spend a lot
of time looking at your screen, remember to take
frequent breaks. Look up periodically and focus on an
object that is further away. This will give the muscles in
your eyes a chance to relax.
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When you type, the keyboard should be positioned so
that your arms are relaxed and comfortable, and your
forearms are roughly horizontal. Your shoulders should
be relaxed and not hunched up.
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Position your mouse on the same surface as your
keyboard so that they are at the same level. Allow
enough space so that you can use your mouse without
stretching or leaning over.
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When you use the mouse, hold it lightly with all your
fingers and click gently. Move the mouse with your entire
arm instead of only using your wrist.
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For more detailed information and tips about how to use
your computer, refer to the online help on your computer
or visit the IBM Healthy computing Web site at
http://www.pc.ibm.com/us/healthycomputing