What is the normal eye pressure?

Intraocular pressure refers to the pressure inside the eye, primarily generated by the aqueous humor within the eye. In healthy individuals, intraocular pressure remains stable within a certain range, which helps maintain the normal shape of the eye and the proper condition of the refractive media.

Generally, the normal intraocular pressure range is between 10 and 21 millimeters of mercury (mmHg). However, it is important to note that this range is statistically derived from data collected from many individuals, and variations exist among people. Some people may have intraocular pressure at the upper limit of the normal range without any problems, while others may experience optic nerve damage even with slightly lower intraocular pressure.

Elevated intraocular pressure (above 21 mmHg) is an important risk factor for glaucoma, but having elevated intraocular pressure does not necessarily mean one will develop glaucoma, and not all glaucoma patients have high intraocular pressure.

In addition, in healthy individuals, the 24-hour fluctuation range of intraocular pressure is generally no more than 8 mmHg, and the difference between the intraocular pressures of the two eyes is generally no more than 5 mmHg.

If you find that your intraocular pressure falls outside the normal range, it is advisable to seek timely medical attention for further examination and treatment. Maintaining good lifestyle habits in daily life, such as balanced nutrition, moderate exercise, and avoiding prolonged eye strain, can help maintain normal intraocular pressure.