The locations of your keyboard and monitor depend on the table or desk that supports them; that, combined with the importance of the
Begin with the table, countertop, desk, or other work surface that holds your computer; whichever you choose, this surface should be dedicated to the computer. Don't try to squeeze the monitor, mouse, and keyboard onto an already cluttered space, because it will probably force you to adopt an
The work surface should be deep enough to place the monitor screen at least 20 inches (50 cm) from your eyes, with the screen directly in front of you. As mentioned earlier in this chapter, remember to keep the screen
Don't try to make more room for a big CRT monitor by placing it in a corner, unless you can place your chair and your keyboard in a position where you're looking directly at the screen. Don't put it in a place where you have to twist your neck or tilt your head to see the screen.
The keyboard and mouse should fit comfortably under your hands, with your wrists at the same level or slightly below your elbows. This allows the height of the surface to be closely
Underneath the surface, you should have
In general, the height of a work surface for a keyboard and mouse should be about four inches lower than a typical desk designed for reading and writing, so the ideal office workstation often has a split surface or a separate adjustable tray for the mouse and keyboard.
The function of any chair,
A chair used at a computer workstation should have these elements:
at the right height to let you keep your feet on the floor or on a footrest, and your knees slightly higher than the seat of the chair. The seat should be wide enough to accommodate your hips, and deep enough to let you change your
that supports the shape of your spine as you change position. In most cases, this means a chair with adjustable lumbar (spinal column) support that fits the small of your back, and which allows you to lean back at least 15 degrees from vertical. As you lean back, the chair should support the weight of your upper body. The relative
that can support your lower arms (below the elbows), while keeping the upper part close to your body and your shoulders
that provides solid support, regardless of your position. The best office chairs have five horizontal legs to prevent
The height of your chair depends on the height of your keyboard and your monitor. If you're sitting in front of a raised drafting table or counter, you should use a stool with a footrest at the correct height to keep your knees at or slightly below your hips and your forearms level.
They're rare, but you might find a chair or stool that has all of these elements in exactly the right places to fit your body. If you find such a