Apple M9971LL User Guide - Page 74

Mouse Position the mouse at the same height as your keyboard and within a comfortable reach. Shoulders relaxed Forearms and hands in a straight line 45-70 cm (18-28 in.) Top of the screen at or slightly below eye level (You may need to adjust the height of your display by raising or lowering your work surface.) Forearms level or tilted slightly Lower back supported Screen positioned to avoid reflected glare Clearance under work surface Thighs tilted slightly Feet flat on the floor or on a footrest 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. 74 Appendix B Care, Use, and Safety Information