Clinical Efficacy and Safety of Minimally Invasive Glaucoma Surgery on Primary Angle Closure Glaucoma

Inclusion Criteria: * Primary Angle Closure Glaucoma (PACG) with visible trabecular meshwork from 90︒ to 180︒ on gonioscopy and IOP couldn't be controlled ≤21mmHg with pilocarpine eye drop only. * willing to accept the antiglaucoma surgery * volunteer to participate in this study and be able to follow up on time * previous antiglaucoma filtering surgery or laser surgery(LPI, SLT) and previous cataract surgery were not ruled out * Exclusion Criteria: * visual acuity lower than HM or central tubular visual field * corneal edema or large pterygium affecting the observation of anterior angle * the demarcation of the scleral process and trabecular meshwork is not clear on gonioscopy * new vessels on the iris surface or in the anterior angle chamber * the eye received surgery is the only eye with visual function, that is the contralateral eye is blind * requiring long-term use of anticoagulant drugs for systemic reasons * abnormal coagulation function * with specific clear scar physique * cannot participate in follow-up