UBM were performed in the same eye of each subject include: Anterior Chamber Depth (ACD), Angle opening distance at 500 µm (AOD500), angle opening distance at 750 µm (AOD750), Trabecular-Ciliary Process Distance (TCPD), Trabecular-iris angle (TIA θ1), Angle recess area (ARA). Then, compare UBM data and gonioscopy.