Normal eye pressure usually ranges between 12 and 22 millimeters of mercury. Readings at 22 mmHg are considered higher than normal, and this condition is sometimes referred to as ocular hypertension.
When a person's intraocular pressure is above the normal range but vision is not impaired, it is considered ocular hypertension. Ocular hypertension is a risk factor for glaucoma, but doesn't necessarily cause the condition. If a person is at risk for glaucoma, then it is recommended to get regular eye screenings every few years starting at the age of 35, states the Glaucoma Research Foundation. Glaucoma can be effectively treated if diagnosed early enough, and many patients who catch the symptoms early do not lose their sight.