To compare the effect of intraocular pressure control and the incidence of peripheral anterior synechia between CLASS combined with phacoemulsification and CLASS alone in the treatment of primary open-angle glaucoma

Group A: CO2 Laser-Assisted Sclerectomy Surgery combined with phacoemulsification; Group B: simple CO2 Laser-Assisted Sclerectomy Surgery. The patients were followed up for 1 year. The incidence of peripheral anterior synechia and Intraocular pressure changes at 1 day, 1 week, 1 month, 2 months, 3 months, 6 months and 12 months were observed and compared between the two groups.

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.