Differences and Similarities Between Primary Open Angle Glaucoma and Primary Angle-Closure Glaucoma

Yiwei Wang,1 Yanzhi Guo,1 Yang Zhang,1 Shouyue Huang,1 Yisheng Zhong1,2 1Author Affiliations Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiao tong University, Shanghai, 200025, People’s Republic of China; 2Author affiliations Department of Ophthalmology, Wuxi Branch of Ruijin Hospital Affiliated Medical School, Shanghai Jiao tong University, Wuxi, People’s Republic of ChinaCorrespondence: Yisheng Zhong; Shouyue Huang, Email [email protected]; [email protected]: Glaucoma is the leading cause of irreversible blindness worldwide. It is an ocular disease characterized by an increase in intraocular pressure or, in some cases, normal intraocular pressure, which leads to optic nerve damage and progressive constriction of the visual field (VF). Primary Open-Angle Glaucoma (POAG) and Primary Angle-Closure Glaucoma (PACG) represent the predominant forms of glaucoma. Numerous hypotheses have been posited to elucidate the pathogenic mechanisms underlying these conditions. There is an emerging understanding of the distinct pathological processes that differentiate the various types of glaucoma. While some similarities in the mechanisms between PACG and POAG have been suggested, evidence indicates that there are also significant differences between the two. This review synthesizes the similarities and differences in the etiology of optic neuropathy caused by POAG and PACG, considering their respective pathophysiological mechanisms, the morphology of the optic disc and surrounding tissues, genetic characteristics, optical coherence tomography angiography, optical coherence tomography, and structural and functional features from VF examinations. These characteristics may contribute to a deeper comprehension of the underlying pathogenesis of glaucoma and enhance the management of different types of this ocular condition.Keywords: pathophysiology, lamina cribrosa, optic nerve head, visual field