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Visual field loss or deterioration of optic disc, or both, among patients randomised to pressure lowering treatment v no treatment in open angle glaucoma (panel A). Panel B shows subgroup analysis of data in normal tension glaucoma. Hazard ratios of less than 1.0 favour pressure lowering treatment. Boxed area is proportional to weight given to each trial in the statistical model. Heterogeneity: χ2 = 0.13 (P=0.72) for open angle glaucoma and χ2 = 0.001 (P=0.97) for normal tension glaucoma
