Participants
POAG, normal-tension glaucoma, VF) loss, HTG, glaucoma, glaucomatous optic nerve structural, high-tension glaucoma, NTG
SECONDARY, EYE, GLAUCOMA
Patients seen at the glaucoma department of the Eye Hospital, China Academy of Chinese Medical Sciences, were screened for eligibility. POAG was defined as angles open on the gonioscopy and optic disc or retinal nerve fiber layer (RNFL) structural abnormalities corresponding to visual field (VF) loss without secondary causes. OHT was defined as an IOP of more than 21 mm Hg without glaucomatous optic nerve structural and functional changes. POAG was classified as high-tension glaucoma (HTG) and normal-tension glaucoma (NTG). Both types exhibited open angles, but HTG was characterized by an IOP higher than 21 mm Hg without treatment, while NTG had an IOP lower than 21 mm Hg on multiple clinic visits or peak measurements before treatment