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Venn diagram showing the number of eyes classified as progressing by visual-field index (VFI), Progressor and early manifest glaucoma trial (EMGT) criteria. There was significant agreement between VFI and Progressor criteria (k=0.43, p=0.001) and between Progressor and EMGT criteria (k=0.21, p=0.013) but not between VFI and EMGT criteria (k=0.073, p=0.51).
