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by Dr. Cesar A. Perez, Jr.

It is the pressure inside the eye brought about by the amount of fluid within its cavity. It keeps the integrity of the structure of the eyeball. Too much fluid inside makes the intraocular pressure high. High eye pressure is one risk factor in developing glaucoma.

The pressure is measured in units of mmHg, the usual normal range of pressure is from 10-21 mmHg.

The picture below shows the path of fluid production responsible for the basis of the intraocular pressure. Any imbalance in this flow results in fluid retention and subsequent elevation of intraocular pressure. In the same way, decreasing the production of fluid and increasing its drainage result in reduction of pressure.

(From the NEI website)