Mouse Trays

What purpose does a mouse tray serve?

One of the most common problems with using a mouse is that there is no room for the mouse next to the keyboard - either the tray is too small, or the keyboard takes up all the available space on the ideal work surface. As a result, people often put the mouse up on the desk (causing them to overextend as they reach up and over the keyboard to perform mousing actions). When the mouse is is too high or far away, using it is uncomfortable and this can lead (over time) to pain and even injury.

A mouse tray allows adjustment of the mousing surface to the appropriate height, rotation and tilt to accomodate an individual's ideal neutral posture. It can also be used to accomodate multiple neutral postures which are required in sit/stand workstations. In many circumstance, a mouse tray can allow an individual to bring the mouse to a much closer, more comfortable and convenient distance from the body than would be possible if the mouse is on the desk.

A palm rest built into a mouse tray can offer support for the palms during periods of rest from typing.

How should my mouse tray be adjusted?

For most people the ideal height of the mouse tray is just below the height of your elbows, as this allows a slightly downward slope (10 degrees) of the forearm to the mousing surface. The orientation of the tray itself should be tilted negatively (i.e. to match the slope of your forearm) and the rotation should be such that the keyboard tray is perpendicular to the arm position.

What should I look for in a mouse tray?

There are only a couple different types of mouse trays available. The main difference is whether they clamp to the desk surface or mount on an articulating arm.

Trays which are made of thin plastic or particle board will often flex, whereas MDF or heavier duty materials will retain their form even with the weight of your hand resting on your mouse. Of course, it is important to have a stable arm to support the tray, as an unstable arm will result in inaccurate mousing motions as you move your mouse in three dimensions..

Palm or wrist rests can serve a useful purpose, however it is important to never rest your wrists on a surface (as this can reduce circulation). Always use your palms to provide contact with any resting surface to ensure an ergonomic neutral resting position.