IBM Aptiva 2198, Reference Manual

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If you place the monitor near a 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 that it shines on your work surface but not onto the
monitor screen.
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Use the monitor controls to adjust the screen 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 comes 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 farther away. This will give the muscles in
your eyes a chance to relax.
Positioning the keyboard
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Make sure the keyboard height is comfortable for typing.
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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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Type with a light touch, keeping your hands and fingers relaxed. Your
wrists should also be straight.
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If your computer comes with a wristrest and you choose to use it, do not
rest your hands on the wristrest or desktop while you are typing.
Instead, use the wristrest only when resting. If you prefer not to use the
wristrest, you may remove it and use the keyboard without it.
Positioning the mouse
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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.
Chapter 1. Product overview
5