Apple MA200Y/A iMac Manual - Page 97
Display, Mouse, Keyboard, More Information About Ergonomics, your thumbs under your palms.
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Display Arrange the display so that 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). Position the display to minimize glare and reflections on the screen from overhead lights and windows. Mouse Position the mouse at the same height as your keyboard and within comfortable reach. Keyboard When you use the keyboard, your shoulders should be relaxed. Your upper arm and forearm should form an angle that is slightly greater than a right angle, with your wrist and hand in roughly a straight line. Use a light touch when typing and keep your hands and fingers relaxed. Avoid rolling your thumbs under your palms. Change hand positions often to avoid fatigue. Some computer users may develop discomfort in their hands, wrists, or arms after intensive work without breaks. If you begin to develop chronic pain or discomfort in your hands, wrists, or arms, consult a qualified health specialist. More Information About Ergonomics Go to www.apple.com/about/ergonomics. Appendix B Safety, Use, and Care Information 97