Apple iMac (21.5-inch, Late 2011) - Manual (Page 64)

64 Chapter 5 Last, but Not Least
Cleaning Your Mouse
You may need to clean your mouse from time to time to remove dirt and dust that has
accumulated in the scroll ball area. Hold the mouse upside-down and roll the scroll
ball vigorously with a clean, soft, lint-free cloth, to help dislodge any particles that may
interfere with proper scrolling.
Understanding Ergonomics
Here are some tips for setting up a healthy work environment.
Keyboard
When you use the 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.
Change hand positions often to avoid fatigue. Some computer users might 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.
Mouse
Position the mouse at the same height as the keyboard and within a comfortable reach.