Comparation of CLASS Combined With Phacoemulsification and CLASS Alone in the Treatment of Primary Open Angle Glaucoma

Inclusion Criteria: * Primary open-angle glaucoma patients with cataract in our Ophthalmic Center; * Topical use of hypotensive drugs in the treatment of poor or intolerable intraocular pressure control; * The patients were aged from 50 to 80 years old, regardless of gender; * Class operation and phacoemulsification were performed; * Patients are able and willing to comply with the research guidance and may complete all visits required by the research; * Informed consent has been signed. Exclusion Criteria: * Allergic to any perioperative medication in this study; * History of ocular trauma; * Any previous intraocular surgery; * Angle of the chamber was narrow by angle microscopy (Schaffer grade III and below); * Patients diagnosed as secondary glaucoma; * Optic atrophy caused by other reasons; * The serious complications such as posterior capsule rupture and choroidal hemorrhage occurred during the operation; * Serious complications of eyes occurred after operation; * The patient's history indicated that he had severe dysfunction of heart, lung, liver and kidney; * Women in pregnancy, lactation or planned pregnancy; * The researchers believe that the patient's condition may put the patient at significant risk, and may confuse the research results.