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General Information
Optical is a technology that uses a sensor to determine the relative position of the mouse instead of the traditional mechanical ball. Using an optical sensor means more precise mouse movement and no dirt and grime build-up associated with ball-based mice. Also, using an optical sensor means you can use the mouse on almost any surface. All these factors contribute to the overall reliability of an optical mouse.
Surface
The surface on which you use the mouse plays an important role in its tracking. The optical sensor must use the pattern on the surface to track the position of the cursor. Therefore, using the mouse on a glass or otherwise see-through surface will inhibit the ability of the sensor to track the cursor. Also, if you are using the mouse on a reflective surface, such as a mirror or shiny metal desk, you may also experience tracking problems. In both these situations, try using the mouse on a mousepad or piece of paper. By using the mouse on a white sheet of paper, you can also conserve battery life. Other surfaces that have been known to cause tracking problems are:
Some wood grains
Grooved surfaces
Trackballs
The ball in trackballs is held in position inside the ball cage by three ball bearings. If one of these bearings becomes dislodged or is missing, the ball will not rest evenly and the tracking will be affected. To see if this is the problem, remove the ball from the ball cage. (This may require removing the retainer ring or simply pushing it out.) Inspect the ball cage and look for three tiny bearings. If one or more is missing, please contact Logitech Sales at 1-800-231-7717, US and Canada, for replacement bearings. Please note, a shipping and handling fee may apply.
Cordless
If you are using a cordless optical device, there are extra variables that might affect the tracking.
Batteries: Tracking can be affected by low or dead batteries. Try replacing the batteries with a fresh set and test the tracking. Although you can use rechargeable batteries, alkaline batteries have been found to have the longest battery life.
Interference with other electrical products: Other electrical devices may interfere with the radio signal that the mouse uses to communicate with the receiver. Try placing the receiver in a different location, away from the monitor, zip drives, and other electrical devices. Also, try rotating the receiver so it is on its side (or back).
Range of the receiver: Logitech cordless pointing devices can transmit a signal up to six feet. Make sure the receiver and mouse are within six feet of each other.





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