Centermouse mouses are a good alternative to a standard mouse when you want to avoid overload on one of both hands (either left or right). A Centermouse can be used with both hands simultaneously. You navigate the cursor over the screen by moving your finger over the touchpad of the Centermouse (similar to the touchpad of a laptop).
The Centermouse has a touch pad and separate buttons for the functions that are normally performed with a mouse. There are separate buttons on the mouse for left click, right click, double click, cut and paste. The Centermouse is placed in front of you in front of the keyboard.