Wearable hands-free mice allow full control of mouse functions without the use of hands. They can be used to access a computer (Windows, Mac, etc.), as well as a tablet or smartphone (Android, iOS)
Primary users of these technologies are or cervical spinal cord injury.
There are various options for hands-free control of your mouse on a computer screen such as reflective dot trackers, lip and chin joysticks, speech recognition or even eye trackers. One other possible group of devices are wearable hands-free mice. With this approach, you wear a sensor (usually on your head but can be worn elsewhere if that works better for you) and as you move, the motion of that sensor controls the mouse cursor.
There is no camera or other optical unit involved, so you do not have to maintain a direct line-of-sight to the computer, and the performance is independent of lighting conditions.
The GlassOuse and the Zono are wireless, requiring no physical connection between the sensor unit that you wear and the computer that you are controlling. They both have perhaps the most thorough and refined designs in this family.
The GlassOuse package is worn like eyeglasses (but without anything in front of the eye). It weighs about 50g. GlassOuse also supplies a range of switches that can be used to perform the mouse click such as bite, puff or a proximity switch.
The Zono is more of a headphone-style mount for its sensor, and also has several alternative ways to wear the sensor, such as an eyeglass clip. The Zono can be used with a breath or puff switch so you can click by blowing lightly on the switch sensor.
The EnPathia and eeZee sensors require that the mouse must be tilted, not rotated, to move the cursor. So the motion used will be quite different in the head-controlled case; to move right, you would tilt your right ear toward your right shoulder, instead of rotating your head to the right. This is a less intuitive and more difficult movement for many people. Finally, an open-source option is the Headmouse by Millmore with build instructions available on instructables.com
Some wearable hands-free mice options to consider are
GlassOuse V1.2 €499
Quha Zono £550
eeZee Switch $599
Head Mouse by Millmore <€50
Video of user using a wearable mouse
The good: These hands-free options can potentially have precise control and are not affected by lighting or sound.
The not so good: Commercial options are expensive.
The verdict: If you need or want the ability to make very fine cursor control, and you are happy to wear a sensor, then these joysticks are a good option for hands-free control.