public EyeData(EyeData other) : this(other.Validity, other) { }
public SingleEyeGazeData(EyeData other, DateTimeOffset timestamp) : base(other) { Timestamp = timestamp; }
public GazeData(EyeData leftEye, EyeData rightEye, DateTimeOffset timestamp) { LeftEye = leftEye; RightEye = rightEye; Timestamp = timestamp; }