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Transitions of the definition and classification of PACG. PACG: Primary angle-closure glaucoma; IOP: Intraocular pressure; ISGEO: International Society of Geographical and Epidemiological Ophthalmology; PACS: Primary angle-closure suspect; PAC: Primary angle closure; EGS: European Glaucoma Society; AAO: American Academy of Ophthalmology; APGS: Asia-Pacific Glaucoma Society; GON: Glaucomatous optic neuropathy.
