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The normal range for intraocular pressure (IOP) in adults is between 10 to 21 mmHg. This range is clinically significant as it is used to help identify individuals at risk for glaucoma, a condition characterized by elevated IOP that can lead to optic nerve damage and vision loss. A measurement above this range may suggest potential glaucoma or other ocular conditions requiring further evaluation.

Understanding IOP is crucial in ophthalmology practice, as it is a key factor in assessing eye health. An IOP below 10 mmHg is not typically associated with any pathological conditions, although very low pressures may have clinical correlations in certain circumstances. Pressures above 21 mmHg are often categorized as elevated and warrant further investigation, as they are correlational with increased risk for glaucomatous changes.

Knowledge of the normal IOP range is essential for clinicians to appropriately interpret measurements and guide management decisions for patients presenting with ocular issues.