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. Author manuscript; available in PMC: 2015 Aug 13.
Published in final edited form as: Exp Eye Res. 2011 Mar 31;92(5):318–327. doi: 10.1016/j.exer.2011.03.011

Fig. 1.

Fig. 1

Comparison between (IOP–EVP) and ocular transients. Mean intraocular pressure (IOP) in the population is ~16 mm Hg and episcleral venous pressure (EVP) is ~8 mm Hg. The difference between IOP and EVP (IOP–EVP) is thus ~8 mm Hg and represents the baseline hydrostatic pressure gradient driving aqueous flow from the eye. Ocular transients of the cardiac pulse, blinking and eye movements superimpose relatively large cyclic IOP gradients on the underlying baseline IOP–EVP gradient. Ocular transient IOP amplitudes from data reported by Coleman and Trokel (1969).