diff --git a/eye2bids/_base.py b/eye2bids/_base.py
index f32cd3b..4739855 100644
--- a/eye2bids/_base.py
+++ b/eye2bids/_base.py
@@ -78,10 +78,12 @@ class BasePhysioJson(dict[str, Any]):
     input_file: Path
     has_validation: bool
     two_eyes: bool
+    has_calibration: bool
 
     def __init__(self, manufacturer: str, metadata: dict[str, Any] | None = None) -> None:
 
         self["Manufacturer"] = manufacturer
+        self["PhysioType"] = "eyetrack"
 
         self["Columns"] = ["x_coordinate", "y_coordinate", "pupil_size", "timestamp"]
         self["timestamp"] = {
diff --git a/eye2bids/edf2bids.py b/eye2bids/edf2bids.py
index 5a2ccb0..c34bfec 100644
--- a/eye2bids/edf2bids.py
+++ b/eye2bids/edf2bids.py
@@ -128,6 +128,10 @@ def _calibrations(df: pd.DataFrame) -> pd.DataFrame:
     return df[df[3] == "CALIBRATION"]
 
 
+def _has_calibration(df: pd.DataFrame) -> bool:
+    return not _calibrations(df).empty
+
+
 def _extract_CalibrationType(df: pd.DataFrame) -> list[int]:
     return _calibrations(df).iloc[0:1, 2:3].to_string(header=False, index=False)
 
@@ -422,16 +426,19 @@ def generate_physio_json(
     base_json.input_file = input_file
     base_json.has_validation = _has_validation(df_ms_reduced)
     base_json.two_eyes = _2eyesmode(df_ms_reduced)
+    base_json.has_calibration = _has_calibration(df_ms_reduced)
 
     base_json["ManufacturersModelName"] = _extract_ManufacturersModelName(events)
     base_json["DeviceSerialNumber"] = _extract_DeviceSerialNumber(events)
-    base_json["EyeTrackingMethod"] = _extract_EyeTrackingMethod(events)
     base_json["PupilFitMethod"] = _extract_PupilFitMethod(df_ms_reduced)
     base_json["SamplingFrequency"] = _extract_SamplingFrequency(df_ms_reduced)
 
     base_json["StartTime"] = _extract_StartTime(events)
     base_json["StopTime"] = _extract_StopTime(events)
 
+    if base_json.has_calibration:
+        base_json["EyeTrackingMethod"] = _extract_EyeTrackingMethod(events)
+
     if base_json.two_eyes:
         metadata_eye1: dict[str, str | list[str] | list[float]] = {
             "RecordedEye": (_extract_RecordedEye(df_ms_reduced)[0]),
diff --git a/tests/test_edf2bids.py b/tests/test_edf2bids.py
index a753aa8..0c1abae 100644
--- a/tests/test_edf2bids.py
+++ b/tests/test_edf2bids.py
@@ -273,7 +273,7 @@ def test_extract_CalibrationUnit(folder, expected, eyelink_test_data_dir):
                     [1126, 636],
                     [794, 444],
                     [960, 348],
-                ]
+                ],
             ],
         ),
         (