Eye pressure, also known as intraocular pressure (IOP), refers to the fluid pressure inside the eye. This pressure is essential for maintaining the eye's shape and ensuring proper function. It is measured in millimeters of mercury (mmHg) during an eye exam, and normal IOP typically ranges from 10 to 21 mmHg. Elevated eye pressure can be a risk factor for glaucoma, a condition that can lead to vision loss if not treated. Regular eye check-ups are important for monitoring IOP, especially for individuals with a family history of glaucoma or other eye conditions.