Hi @gintaran and thanks for your query. Yes indeed! It’s very possible to use the gaze data to activate a button on your own customised application.
To get started quickly, we recommend that you download the sample application “Interaction_WPF_101” from the Core SDK Github page @ https://github.com/Tobii/CoreSDK
wherein it is demonstrated how to make a WPF component gaze aware (which of course can include a standard button) and react when gaze data is received.
That being said, I am not sure how you intend to determine accuracy and precision using this technique.. perhaps you could expand on this and your project intentions? Please be aware that any use of the Gaze Data for analysis requires the purchase of the analytical use licence for these purposes.
You can read more about this @ https://analyticaluse.tobii.com/
Also, have you already seen within the Tobii Software in the tray icon the option to “test and improve calibration”? If you select this, you will be given a graphical representation of the accuracy for your profile…perhaps this is sufficient for your needs?