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To assess the cumulative risk of progression in glaucomatous eyes in the severe stage of disease. This was a retrospective observational study. Patients that had severe damage in at least one eye, as defined by three criteria including a mean deviation of ≤ - 20dB, were included. Glaucoma progression was defined as a loss of ≥ 2dB in mean deviation confirmed in three consecutive visual field tests, or a persistent loss of two or more lines of vision-not attributable to non-glaucomatous causes-in three consecutive follow-up examinations