If the unit of the number in the title is mmHg, then the intraocular pressure of 30mmHg is beyond the normal range of intraocular pressure, but whether it is abnormal or not needs further examination. Intraocular pressure is the pressure of the contents of the eyeball on the interaction between the wall and the contents of the eyeball, the normal intraocular pressure range is 10-21mmHg. However, if the patient’s cornea thickness is thicker, the patient’s intraocular pressure can be higher than the normal range. Normal intraocular pressure is not only reflected in the value of intraocular pressure, but also the symmetry of both eyes, day and night pressure is relatively stable. The higher the IOP, the higher the chance of optic nerve damage and progression to glaucoma. However, high IOP is not the same as glaucoma, as different individuals have different optic nerve tolerance to IOP, so there is no strictly speaking absolute safe limit for IOP. High intraocular pressure is one of the factors contributing to glaucoma, but it is also extremely important and the only factor that can be measured and controlled. It is recommended that patients with abnormal intraocular pressure be seen promptly for evaluation of their condition and treatment as prescribed by their physician.