Almost every computer program used today requires the use of the mouse. Long hours using a mouse incorrectly can lead to fatigue, discomfort, and an increased likelihood of an injury occurring.

The following tips may help reduce mouse-related problems:

• The mouse should be placed on the same level as the keyboard and as close to the middle of the body as possible.
• Grip the mouse loosely—avoid choking or gripping it too tightly. A tightly gripped mouse only increases muscle tension and fatigue.
• Maintain a straight wrist when mousing. Avoid wrist deviations or bending the wrist towards the little finger or thumb.
  
• Avoid unnecessary movements like holding the "clicking" finger up. Lightly click the mouse.
• Set-up the mouse for what you do:
  • Program the mouse to drag lock, if the mouse has this feature, to reduce static loading.
  • Program the mouse to open items with a single click. In Windows, go to the Control Panel > Mouse > Button tab.
  • Set-up macros for complex repetitive tasks. This will also save you time.
• Use the correct mouse. Things to consider when selecting a mouse:
  • Size. Some models come in sizes to fit small to large hands.
  • Shape. Some models are contoured, as well as angled to put your hand in more of a neutral posture.
  • Right- versus left-handed. Some models are designed and contoured to fit either one hand or the other with the buttons preset.
  • Features. Consider a mouse with a scroll wheel or a built-in trackball.
• Always use a mouse pad that allows free movement of the hand, arm, and mouse. If using a ball-type versus an optical or cordless mouse, turn the mouse over and periodically take the ball out and clean it.
• Use keyboard shortcuts to reduce mouse use. (See the ErgoMatters™ Keyboard Shortcuts for more information).
• Consider switching the mouse to your non-dominant hand. This may take a bit of getting used to but can reduce the load on one hand if you use the mouse constantly. Moving from the right hand to the left hand brings the mouse closer to the middle of your body as the numeric keypad forces your hand and arm out further on the right side than on the left side. If you try this, make sure that you change the mouse buttons (In Windows, go to your Control Panel > Mouse > Button tab) and also consider using a symmetrically shaped mouse.

See OSHA Computer Workstations eTool at www.osha.gov/SLTC/etools/computerworkstations/index.html for more information.