Although mice with a rolling ball can still be found like the Logitech RX300, most mice are now optical, using a small beam of light rather than a rolling ball to track movement. An optical mouse is more reliable and has no moving parts that can break. They are also slightly lighter and can be used effectively on a surface that isn’t entirely flat.

Most mice have the left and right click buttons at the front; these should be easy to use and be able to be applied with minimum pressure. Some mice have various other buttons on them used to scroll or move up and down a page. If you need these, again make sure that they are easy to locate and use; if you don’t need them, consider a simpler mouse that has the left and right click buttons only.