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Mean PERG phase (average of the two eyes) measured in different conditions of body posture in normal controls and in patients with either suspicion of glaucoma or manifest glaucoma in the early stages. Labels on the x-axis: Bas, baseline seated; Tilt, whole body −10 degrees head-down; Rec, recovery seated. In all panels, errors bars represent the SEM. P-values for statistical differences with baseline are marked with asterisks (*, <0.05; **, <0.01; *** <0.001).
