https://learn.microsoft.com/en-us/uwp/api/windows.devices.input.preview.gazeinputsourcepreview.gazeexited?view=winrt-26100
GazeInputSourcePreview.GazeExited Event (Windows.Devices.Input.Preview) - Windows apps | Microsoft...
Occurs when the eye-tracking device detects that the gaze point has moved outside the bounding area of the element.
windows deviceseventinputpreviewapps