AAO accepted the ISGEO classification, and in PPP 2016 , the diagnostic criteria of PACS, PAC, and PACG were listed in [Table 1].[16]{Table 1}
The traditional definition and classification of PACG are still the most widely accepted in China despite the ISGEO definition having been proposed for more than a decade.
The Expert Consensuses 2014 kept the same definition and classification of PACG as that of The Expert Consensuses 2008 ; however, it suggested that Chinese ophthalmologists adopt the ISGEO classification and also advocated for the combination of the ISGEO classification, classification based on clinical manifestations, and classification based on angle-closure mechanisms.[7]
The basis of the ISGEO definition of PACG is that PAC is a unique disease of the anterior ocular chamber, which can increase the risk of developing PACG.
Some Chinese researchers believe that the ISGEO definition was disputable and argued that 'there is a causal relationship between PAC, elevated IOP, and the occurrence of GON.