Apple Mac Pro (Early 2008) - Manual (Page 100)

100 Chapter 6 Last, but Not Least
Understanding Ergonomics
Here are some tips for setting up a healthy work environment.
 Use an adjustable chair that provides firm, comfortable support. Adjust the height of
the chair so your thighs are tilted slightly and your feet are 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.
 When you use the computer keyboard, your shoulders should be relaxed. Your upper
arm and forearm should form an approximate right angle, with your wrist and hand
in roughly a straight line.
You may have to raise the chair so that 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 can 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.
 Position the mouse at the same height as the keyboard and within comfortable
reach.
 Arrange the display so that the top of the screen is slightly below 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).