Power Computing PowerCenter PRO User Manual page 136

Safety and Health Information
Preventing eye strain
Whenever you focus your eyes on a nearby object for a long time — whether
you are reading, sewing, or working on a computer — your eyes can get tired.
Follow these suggestions to prevent eye strain:
Take frequent breaks. Periodically look away from the screen and focus
your eyes on something farther than 20 feet away.
To prevent glare on the screen, avoid working with a window or light
source behind you. Turn off lights or close drapes if necessary.
Place your monitor, chair, and work table so that the top of the monitor is
slightly below the top of your head and the screen is 18-28 inches away
from you. This may require placing something under the monitor.
Preventing discomfort and fatigue
Like any activity that involves sitting for long periods of time, using a
computer can make you tired and stiff. In addition, using a keyboard and
mouse improperly can sometimes be associated with RSIs (repetitive stress
injuries), particularly in the wrists. Follow these suggestions to prevent
discomfort:
Take frequent breaks. Stand up, stretch, and walk around. These breaks are
not wasted time. They help you work more effectively in the long run.
Adjust your chair so that your lower back and thighs are supported and
your feet are flat on the ground (or on a footrest).
Adjust your chair and work table so that you can type and use the mouse
with your elbows at a 90° angle, your forearms level, and your hands in a
straight line with your forearms. A work table equipped with an adjustable
keyboard tray may make this easier.
Do not place your wrists on the hard edge of your table. Use a wrist pad.
Sit up straight in your chair. Slouching puts unnecessary strain on your
back.
Do not strike the keys any harder than necessary.
106
PowerCenter Pro User's Guide
For Technical Support, Call 1-800-708-6227