Apple PowerBook (2400c) User Manual
Page 127
Mouse
m 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.
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Health, Safety, and Maintenance Tips