The goal of this observational study is to discuss the correlation between primary angle-closure glaucoma and the state of the suspended ligament of the lens and the pathogenesis of PACG by measuring the biological data of primary angle-closure glaucoma and observing its anatomical changes.

Patients clinically diagnosed with Primary angle-closure glaucoma (PACG) and normal control patients from December 2020 to January 2022 were enrolled in this study.

Inclusion Criteria:

• The depth of the anterior chamber is normal, and the whole corner of the chamber is open;
• The cup-to-plate ratio is less than 0.5;
• No family history of glaucoma.

Exclusion Criteria:

• Previous history of trauma or internal eye surgery in both eyes or one eye;
• Used "pilocarpine", "atropine" and other drugs to change the size of the pupil and the shape of the chamber Angle within 1 week;
• Combined with other eye diseases affecting the Angle and suspension ligament, such as uveitis, ciliary cyst, high myopia, retinal diseases, etc.;
• Can not cooperate with UBM and Angle scopy;
• Refuse to participate in this researcher.

From December 2020 to January 2022, patients with primary angle-closure glaucoma and normal control patients were diagnosed for the first time and intended to undergo cataract surgery in the ophthalmology department of the First Affiliated Hospital of Shandong First Medical University (Shandong Qiandfo Hospital).