Surgical procedures
LENS
KDB goniotomy and ab interno trabeculotomy with the microhook were performed as per the instructions for use. Cohesive viscoelastic was injected into the anterior chamber through a 2.4-mm corneal incision temporally after the standard phacoemulsification and intraocular lens implantation. The patient’s head was rotated 30° to the contralateral side of the corneal incision area, and a surgical microscope is adjusted to allow nasal angle visualisation using the Ocular Hill Open Access Surgical Gonio lens (Ocular instruments, WA, US). Either the KDB or the microhook was inserted into the anterior chamber under the gonio prism. In KDB goniotomy, a strip of TM spanning for approximately 4 h was excised circumferentially in a band, whereas in ab interno trabeculotomy with the microhook, approximately 4 o’clock circumferential incision was created. All patients received similar preoperative topical medications: 0.5% levofloxacin three times daily for 3 days pre-operatively. All patients received similar postoperative topical medications: 0.5% levofloxacin and 0.1% betamethasone three times daily for a week and nepafenac three times daily for 3 months postoperatively, respectively.