Abstract
Aqueous outflow via the conventional outflow pathway is dependent on the pressure gradient between intraocular pressure (IOP) and episcleral venous pressure (EVP). According to the Goldmann equation: IOP = F/C + EVP (F aqueous humor inflow, C outflow facility). This implies that EVP elevation uncompensated by reduced aqueous inflow or increased aqueous outflow facility will result in increased IOP.4 The definite relation between EVP and IOP, however, is unclear. The normal episcleral venous pressure is 8-10 mm Hg; variability depends on the measurement technique.5 It is thought that for every mm Hg rise in EVP, there is an equal increase in the intraocular pressure; although it has been suggested that the magnitude of rise of intraocular pressure can be more.6
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