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Rates of global visual field (VF) change based on the baseline level of VF damage and mean follow-up intraocular pressure (IOP). 
, 1st IOP tertile; 
, 2nd IOP tertile; 
, 3rd IOP tertile. Mean IOP values for each tertile: mild: <14.68, 14.68–17.45, and 17.45–23.81 mm Hg; moderate: <14.50, 14.50–16.80, and 16.80–22.81 mm Hg; severe: <13.31, 13.31–15.35, and 15.35–21.58 mm Hg.
