OSH Answers Fact Sheets
Easy-to-read, question-and-answer fact sheets covering a wide range of workplace health and safety topics, from hazards to diseases to ergonomics to workplace promotion. MORE ABOUT >
Why isn't the most common placement of the computer mouse the best?
Typically we position the mouse at the right (or left) of the keyboard.
This is not the easiest place to reach, however. Having 'extra keys' to the right of the letter and number keys (for example, arrow keys, insert, page down and the number pad) do not allow users to place the mouse more directly in line with their arm and shoulder. Reaching your arm forward or sideways beyond an "easy reach" zone can lead to these discomfort and even injury. (For more on this, please see the OSH Answers document Computer Mouse: Common Problems from Use).
Where is the right place for a computer mouse?
There is no right or wrong place for a mouse. Rather, you must properly assess your work space to ensure you can use the keyboard and mouse without causing discomfort to the body.
Some computer workstations (Figure 2) do not have enough space to properly position a mouse, but a space must be made so that the workstation is safe and comfortable. One way to make this space is by using a mouse platform. Another way to make this space is by using a shorter keyboard (for example, one without a number pad).
How can a mouse platform help computer users?
When there is not enough space on the desk to position a mouse within easy reach, you can use a mouse platform. A mouse platform covers the numerical pad on the right side of the keyboard - which is rarely used in many office functions - and serves as a place for the mouse to sit. (Figure 2). The mouse is then closer to the person using it. As well, because the mouse is on a platform, you avoid the tendency to wiggle it further and further away, which would make you reach even further and cause muscle strain.
However, the height of the mouse platform puts your hand in a slightly unnatural position. To make using it more comfortable, you can use a forearm support. (Figure 3).
Advantages of a mouse platform:
- Reduces sideways and forward reaching.
- Reduces the overall area in which you use the mouse.
Disadvantages of a mouse platform:
- The platform raises the mouse a little above the keyboard. Using a slightly higher arm support with the platform can position your hand more naturally.
How can a shorter keyboard help computer users?
Computer keyboards come in many sizes. By using a shorter (35.6 cm or 14" long) keyboard instead of a regular (45.7 cm or 18" long) one, you will have an extra 10.2 cm or 4 inches of space at the side of the keyboard where the mouse can be placed (Figure 4).
Advantages of a shorter keyboard:
- The extra 10.2 cm (4 inches) gained by using a shorter keyboard will make you have to reach sideways much less.
- Fewer sideways movements mean you will be more comfortable and less likely to get injured.
Disadvantages of a shorter keyboard:
- A shorter keyboard means you have to get used to a slightly different key arrangement. However, most people don't mind this as long as using the mouse becomes more comfortable.
Note: Whatever shape, size, or application of mouse you use, a battery-powered cordless mouse is highly recommended. It eliminates one of the most common problems with using a mouse: the cord getting stuck or in the way.
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