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Health, Safety, and Maintenance 69
To prevent discomfort and eye fatigue:
m Arrange your work space so that the furniture is properly adjusted for you and doesn’t
contribute to an awkward working posture.
m Take frequent short breaks to give your muscles and eyes a chance to rest.
Arranging Your Work Area
Here are some guidelines for adjusting the furniture in your office to accommodate your
physical size and shape.
m An adjustable chair that provides firm, comfortable support is best. Adjust the height of
the chair so your thighs are horizontal and your feet flat on the floor.
The back of the chair should support your lower back (lumbar region). Follow the
manufacturer’s instructions for adjusting the backrest to fit your body properly.
m When you use the computer keyboard, your shoulders should be relaxed. Your upper arm
and forearm should form an approximate right angle, with your wrist and hand in roughly
a straight line.
You may have to raise your chair so your forearms and hands are at the proper angle to
the keyboard. If this makes it impossible to rest your feet flat on the floor, you can use a
footrest with adjustable height and tilt to make up for any gap between the floor and your
feet. Or you may lower the desktop to eliminate the need for a footrest. Another option is
to use a desk with a keyboard tray that’s lower than the regular work surface.
m Position the mouse at the same height as your keyboard. Allow adequate space to use the
mouse comfortably.
m Arrange the monitor so the top of the screen is slightly below your eye level when you’re
sitting at the keyboard. The best distance from your eyes to the screen is up to you,
although most people seem to prefer 18 to 28 inches (45 to 70 cm).