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Intraocular pressure
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==Physiology== Intraocular pressure is determined by the production and drainage of [[aqueous humour]] by the [[ciliary body]] and its drainage via the [[trabecular meshwork]] and uveoscleral outflow. The reason for this is because the [[Vitreous body|vitreous humour]] in the [[Posterior segment of eyeball|posterior segment]] has a relatively fixed volume and thus does not affect intraocular pressure regulation. An important quantitative relationship (Goldmann's equation) is as follows:<ref name="pmid27477112">{{cite journal | vauthors = Aptel F, Weinreb RN, Chiquet C, Mansouri K | title = 24-h monitoring devices and nyctohemeral rhythms of intraocular pressure | journal = Prog Retin Eye Res | volume = 55 | pages = 108–148 | date = November 2016 | pmid = 27477112 | doi = 10.1016/j.preteyeres.2016.07.002 | s2cid = 24677841 }}</ref> :<math>P_o = \frac{F - U}{C} + P_v</math> Where: * <math>P_o</math> is the IOP in millimeters of mercury (mmHg) * <math>F</math> the rate of aqueous humour formation in microliters per minute (μL/min) * <math>U</math> the resorption of aqueous humour through the uveoscleral route (μL/min) * <math>C</math> is the facility of outflow in microliters per minute per millimeter of mercury (μL/min/mmHg) * <math>P_v</math> the episcleral venous pressure in millimeters of mercury (mmHg). The above factors are those that drive IOP.
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