void setFieldOfView([VRFieldOfView leftFov, VRFieldOfView rightFov])

Source 

void setFieldOfView([VRFieldOfView leftFov, VRFieldOfView rightFov]) {
  if (rightFov != null) {
    _blink.BlinkHMDVRDevice.instance.setFieldOfView_Callback_2_(this, leftFov, rightFov);
    return;
  }
  if (leftFov != null) {
    _blink.BlinkHMDVRDevice.instance.setFieldOfView_Callback_1_(this, leftFov);
    return;
  }
  _blink.BlinkHMDVRDevice.instance.setFieldOfView_Callback_0_(this);
  return;
}