11Ergonomic Computing HabitsCAUTION: Improper or prolonged keyboard use may result ininjury.CAUTION: Viewing the monitor screen for extended periods oftime may result in eye strain.For comfort and efficiency, observe the following ergonomic guidelineswhen setting up and using your computer:• Position your computer so that the monitor and keyboard are directlyin front of you as you work. Special shelves are available (from Dell andother sources) to help you correctly position your keyboard.• Set the monitor at a comfortable viewing distance (usually 510 to 610millimeters [20 to 24 inches] from your eyes).• Make sure the monitor screen is at eye level or slightly lower when youare sitting in front of the monitor.• Adjust the tilt of the monitor, its contrast and brightness settings, andthe lighting around you (such as overhead lights, desk lamps, and thecurtains or blinds on nearby windows) to minimize reflections andglare on the monitor screen.• 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 or mouse.• Always leave space to rest your hands while using the keyboard ormouse.• 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.
