IOP (intraocular pressure): The pressure created by the continual renewal of fluids within the eye. The normal IOP varies among individuals. The intraocular pressure is increased in glaucoma.
In acute angle-closure glaucoma, the intraocular pressure rises because the canal which normally drains the fluid in the front part of the eye is suddenly blocked.
In chronic glaucoma, there is a gradual imbalance between the production and removal (resorption) of the fluid in the back part of the eye (with supply exceeding demand).
Source: MedTerms™ Medical Dictionary
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