When using the hands or the head (for example for a head mouse) has become impossible and if also pressing a switch by a foot (for example for scan mode) is not possible, an eye tracker is recommended. An eye trackeris a camera that watches where the patient is looking at on the screen. The eye tracker then places the mouse pointer accordingly on the screen. By blinking or by staring at a certain point (this is called "dwelling"), a mouse click can be done at this location. This way cells in OnScreenCommunicator can comfortably be clicked, and a text can be typed using OnScreenCommunicator's virtual keyboard which can then be spoken by the computer voice. OnScreenCommunicator directly connects to most eye trackers. This way the user can perform possibly needed re-calibrations comfortably from within OnScreenCommunicator, and the camera window will be shown in one of OnScreenCommunicator's cells.
There are several eye tracking systems available.
The most popular systems are "EyeTech®", "SeeTech®" and "Intelligaze®".
These eye trackers are to be recommend over other systems because they allow the patient to navigate the desktop just the usual way.
Using one of the mentioned systems, you may freely choose your communication software, and you may also use any other applications that you would normally control with a computer mouse.
It is important to start training with the eye tracker early.
There will be body position from time to time where the eye tracker will not work as expected.
Sometimes the eye tracker has to be positioned in a different way so that the camera can properly track the eyes.
It is recommend to try that out together with the health care people while one can still communicate and move relatively easily.
Owning an eye tracker does not mean that you have to use it anytime.
It should simply be about getting familar with the eye tracker in calm times.
Doing that, using the eye tracker during times where there is no other possibility will be much more relaxed, and one will not be overtaxed.