A trackball is a specific style of computer mouse that allows the user to keep their hand and arm in one place, while manipulating a ball that moves the on-screen pointer. The computer mouse is a critical element to any home or office PC (personal computer) set up. The mouse provides the user a way to move the pointer on the computer screen to the desired location, as well as the means to select an object. Used in all applications from office software to gaming and web surfing, mouse comfort and ease of use is paramount.

The traditional computer mouse has been a “point and click” tool, where the user physically moves the mouse across a mouse pad, desktop, or other surface with either left or right hand until the pointer (or cursor) is at the correct position on the screen. Once there, the user clicks either the right button or the left button to select the location and place the cursor. This type of navigation requires arm and wrist movement, and the location of the mouse assembly is variable.

The trackball mouse performs the same functions as the original style mouse, however instead of moving the entire mouse to position the cursor, a small solid ball is located left of center or directly on the top of the mouse which is used to navigate the cursor across the screen. Using a trackball style mouse allows the PC user to roll the ball with the thumb (or fingers or palm) and move the cursor to the desired location without moving the complete mouse assembly. This reduces the arm and wrist movement previously required to maneuver the original style mouse and prevents the user from having to reposition the mouse frequently.

In addition to the diminished need for arm movement while manipulating the mouse, the thumb controlled trackball mouse offers greater accuracy in placing the cursor at the anticipated location. Unlike some conventional desktop computer mouse tools, the trackball mouse navigates smoothly and does not “jump” or stick on the mouse pad or desktop surface. Excellent for using when arm movement is constrained, the trackball mouse does not need a mouse pad or smooth surface underneath it to operate efficiently, as the trackball doesn’t depend on contact with anything other than the user moving the ball itself.

Though not proven to prevent computer-related injuries, such as repetitive stress injuries, users with physical constraints may find the trackball mouse a better choice than the conventional point and click tools. Prior to choosing a computer mouse, users should consider what applications are used most frequently, duration of use, space constraints and physical limitations. To compare conventional and trackball mouse makes and models, consult your local computer store or research online.