Apple PowerBook G3 User Manual
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Appendix
Mouse
If you use an external mouse, position the mouse at the same height as your keyboard. Allow
adequate space to use the mouse comfortably.
Built-In Display
m Adjust the angle of the display to minimize glare and reflections from overhead lights and
windows.
m You may need to adjust the brightness and contrast of the screen when you take the
computer from one work location to another, or if the lighting in your work area changes.
External Monitor
If you use an external monitor, this suggestion may be helpful.
m If possible, arrange the monitor so the top of the screen is slightly below your eye level
when you’re sitting at the keyboard. The best distance from your eyes to the screen is up
to you, although most people seem to prefer 18 to 28 inches (45 to 70 cm).
Avoiding Fatigue
m Change your seated position, stand up, or stretch whenever you start to feel tired.
Frequent short breaks are helpful in reducing fatigue.
m Allow adequate work space so that you can work comfortably. Place papers or other items
so you can view them easily while using your computer. A document stand may make
reading papers more comfortable.
m Eye muscles must work harder to focus on nearby objects. Occasionally focus your eyes
on a distant object, and blink often while you work.
m Clean your screen regularly. Keeping the screen clean helps reduce unwanted reflections.
What About Electromagnetic Emissions?
There has been recent public discussion of the possible health effects of prolonged exposure
to extremely low frequency (ELF) and very low frequency ( VLF) electromagnetic fields. Such
fields are associated with electromagnetic sources such as television sets, electrical wiring,
and some household appliances—as well as computer monitors.
Apple has reviewed scientific reports and sought the counsel of government regulatory
agencies and respected health organizations. Based on the prevailing evidence and opinions,
Apple believes that the electric and magnetic fields produced by computer monitors do not
pose a health risk. In response to those customers who wish to reduce their exposure to
electromagnetic fields, Apple has lowered the emission levels of its products.