By reviewing the surgery record: For 120°GT, in the case of the nasal quadrant, a clear corneal incision, typically 2.2-3.0 mm wide, was made in the temporal quadrant before the injection of ophthalmic viscoelastic devices into the anterior chamber. Subsequently, the patient's head was rotated 35-40 degrees away from the surgeon, and the surgical microscope was tilted 30-40 degrees downward toward the surgeon to enable maximal visualization of the nasal angle. Then, a viscoelastic was applied to the corneal surface, and the surgical goniolens was gently positioned on the cornea and adjusted to observe the nasal angle. A microhook was inserted into the anterior chamber through a corneal incision. The tip of a microhook was then inserted into the Schlemm's canal and moved to incise its inner wall and trabecular meshwork with 120°GT. After aspiration of the ophthalmic viscoelastic devices, the corneal incision was closed.

By reviewing the surgery record: For 240°GT, two corneal incisions were made, for example, in the superonasal and superotemporal quadrants or in the temporal and superonasal quadrants. Curved hooks, such as TMH, LAN, were specifically used for the incision in the superonasal position.

By reviewing the surgery record: For 360°GT, a corneal incision was made in temporal quadrant firstly. Viscoelastics were then injected into the anterior chamber to deepen it. A 23-gauge tangential paracentesis was performed in either the superonasal or inferonasal quadrant to allow microcatheter entry. A microcatheter was then inserted into the anterior chamber. Under direct visualization with a surgical goniolens, a 1-2 mm goniotomy was performed at the nasal angle using a microblade. Microsurgical forceps were then used to grasp the microcatheter within the anterior chamber and guide its distal tip into the SC at the goniotomy incision. The microsurgical forceps were used to advance the catheter through the canal circumferentially. Once the distal tip was retrieved after the catheter had passed 360 degrees, it was externalized through the temporal corneal incision. Next, traction was applied to the proximal aspect of the catheter and complete the surgery.

The porportion of participants who achieve Intraocular pressure (IOP) ≤ 21 mmHg regardless of topical hypotensive medications, no vision-threatening complications, and no reoperation. The IOP will be measured using Goldmann applanation tonometry or iCare tonometer.

The porportion of participants who achieve Intraocular pressure (IOP) ≤ 21 mmHg without any topical hypotensive medications, no vision-threatening complications, and no reoperation. The IOP will be measured using Goldmann applanation tonometry or iCare tonometer.

Number of intraocular pressure-lowering medications required postoperatively: the number and types of medications in use at each follow-up visit. The information will be documented per visit from the electric medical system.

Visual acuity (if the patient is capable of performing visual acuity testing): best-corrected visual acuity at each follow-up visit, using Early Treatment Diabetic Retinopathy Study [ETDRS] chart; if the subject is able to cooperate with visual field testing, pre- and postoperative changes in the visual field may be assessed, using Humphrey tonometry (750, Zeiss, CA, US).