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What causes pressure in the eye?

The pressure within the eye is defined by the rate of production of aqueous humor (the fluid within the eye) and the rate of drainage of that fluid from the eye through the drainage canal. When eye pressure builds up, it can usually be attributed to one of two factors: Either the drainage canal is failing to drain properly, or there is an excess of production of aqueous humor. The former causal factor is defined medically as glaucoma and is the usual culprit of high ocular pressure, whereas the latter is typically caused by an abnormality or tumor-growth of the ciliary body and far less common.

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