viiiFor comfort and efficiency, observe the following ergonomic guidelines when settingup and using your computer:• When setting up the computer for work, place it on a level surface.• Position your computer directly in front of you as you work.• Adjust the tilt of the computer’s display, its contrast and/or brightness settings,and the lighting around you (such as overhead lights, desk lamps, and thecurtains or blinds on nearby windows) to minimize reflections and glare onthe display.• When using an external monitor with your computer, set the monitor at acomfortable viewing distance (usually 510 to 610 millimeters [20 to 24 inches]from your eyes). Make sure the monitor screen is at eye level or slightly lowerwhen 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 positionwhile using the keyboard, trackball, touch pad, or external mouse.• Always use the palmrest with the keyboard, touch pad, or trackball. Leave spaceto 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 not on thefront of your chair seat. Adjust your chair’s height or use a footrest, if necessary,to maintain proper posture.• Vary your work activities. Try to organize your work so that you do not have totype for extended periods of time. When you stop typing, try to do things thatuse both hands.arms at desk levelcomputer positioneddirectly in frontof user wrists relaxedand flat
