The computer mouse has undergone a lot of changes and improvements since the first mouse was created in 1964 by Douglas Englebart of Stanford University. The design has been improved, made more accurate, and made much more ergonomic for daily use. The role of the computer mouse has also evolved from simply moving a cursor on the screen to now controlling almost all operations on your computer.

The graphical user interface was introduced in the computer world in the late 1980s. After that computer companies realized the fact that users were forced to use only the keyboards and most of them wished another device to ease their interaction with the computer. The mouse was introduced and became a quick success; we cannot imagine a computer now without a computer mouse on the side. I don't know if there are any users who work only with the keyboard, although it is technically possible to utilize keyboard shortcuts to replace the mouse. However, using a mouse is quicker and easier. First there was the traditional roller mouse, that was ok for its time, but it had a lot of inconveniences: the ball got dirty and sticky very often and the cursor movement was not very smooth and accurate. Then there was the optical mouse, much better than the ball one, but still lacking some features.

The latest upgrade to the computer mouse is the introduction of a laser instead of the LED light source of the optical mouse; this is the laser computer mouse. The laser mouse is the most sensitive mouse available invented so far. A laser mouse is a type of computer device that uses a laser beam rather than a ball to track the movement of the cursor. Laser mice are becoming increasingly common because they have better tracking ability. Plus, they do not stick to the mouse pad or get dirty and do not distort the signal as conventional ball mice did. They lack moving parts so they are far less subject to damage.
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The laser mouse uses less power and is able to detect even the smallest movements of the user. Big computer companies such as Logitech and Microsoft saw the great demand of laser mice, especially coming from avid gamers and visual artists, so they are now producing this kind of computer mouse on a large scale. The new sensitivity of the laser mouse is an improvement you have to pay for, often double that for a standard optical mouse and 4 times the price of a mechanical mouse.
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In 1998, Sun Microsystems provided a laser mouse with their Sun SPARCstation servers and workstations. However, laser mice invaded the market only starting with 2004, when Logitech, in partnership with Agilent Technologies, introduced its MX 1000 laser mouse. This mouse has significantly increased the resolution of the image taken by it. When it comes to surface tracking power the laser mouse is 20 times more efficient compared to conventional optical mice, because of their interference effects.

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