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Autoregulation of choroidal blood flow in humans. Change in mean choroidal blood flow (ChBFm) is plotted versus mean ocular perfusion pressure (PPnorm), where PP was decreased by slowly increasing the intraocular pressure. Both ChBFm and PP are normalized. Note that relationship is not linear, indicating an autoregulatory mechanism. Error bars represent the 95% confidence interval; from Riva et al. (1997b).
