| Tobii Pro SDK C API
    | 
| Data Fields | |
| TobiiResearchNormalizedPoint2D | position_in_tracking_area | 
| TobiiResearchValidity | validity | 
Provides properties for the HMD pupil position.
| TobiiResearchNormalizedPoint2D TobiiResearchHMDPupilPosition::position_in_tracking_area | 
The (normalized) 2D coordinates that describes the pupil's position in the HMD's tracking area.
| TobiiResearchValidity TobiiResearchHMDPupilPosition::validity | 
The validity of the pupil position data.