16 When Using Your C omput erw w w . d e l l . c o m | s u p p o r t . d e l l . c o m Ergonomic Computing HabitsCAUTION: Improper or prolonged keyboard use may result ininjury.CAUTION: Viewing the display or external monitor screen forextended periods of time may result in eye strain.For comfort and efficiency, observe the following ergonomic guidelineswhen setting up and using your computer:• Position your computer directly in front of you as you work.• Adjust the tilt of the computer’s display, its contrast and/or brightnesssettings, and the lighting around you (such as overhead lights, desklamps, and the curtains or blinds on nearby windows) to minimizereflections and glare on the display.• When using an external monitor with your computer, set the monitorat a comfortable viewing distance (usually 510 to 610 millimeters [20to 24 inches] from your eyes). Make sure the monitor screen is at eyelevel or slightly lower when you are sitting in front of the monitor.• Use a chair that provides good lower-back support.• Keep your forearms horizontal with your wrists in a neutral,comfortable position while using the keyboard, touch pad, track stick,or external mouse.• Always use the palm rest with the keyboard, touch pad, or track stick.Leave space to rest your hands when using an external mouse.• Let your upper arms hang naturally at your sides.• Sit erect with your feet resting on the floor and your thighs level.• When sitting, make sure the weight of your legs is on your feet and noton the front of your chair seat. Adjust your chair’s height or use afootrest, if necessary, to maintain proper posture.• Vary your work activities. Try to organize your work so that you do nothave to type for extended periods of time. When you stop typing, tryto do things that use both hands.1H018bk3.book Page 16 Monday, October 14, 2002 2:26 PM
