Apple iBook (Original) - Manual (Page 29)

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Chair
An adjustable chair that provides firm, comfortable support is best.
Adjust the height of the chair so your thighs are horizontal and your
feet flat on the floor. The back of the chair should support your lower
back (lumbar region). Follow the manufacturer’s instructions for
adjusting the backrest to fit your body properly.
You may have to raise your chair so your forearms and hands are at the
proper angle to the keyboard. If this makes it impossible to rest your
feet flat on the floor, you can use a footrest with adjustable height and
tilt to make up for any gap between the floor and your feet. Or you
may lower the desktop to eliminate the need for a footrest. Another
option is to use a desk with a keyboard tray that’s lower than the
regular work surface.
External mouse
If you use an external mouse, position the mouse at the same height as
your keyboard and within a comfortable reach.
Built-in display
Adjust the angle of the display to minimize glare and reflections from
overhead lights and windows.
You can adjust the brightness of the screen when you take the
computer from one work location to another, if the lighting in your
work area changes.
For more information
For additional ergonomic information, see the Apple ergonomic
Web site at www.apple.com/about/ergonomics