High intraocular pressure (IOP) can be caused by a variety of reasons, such as glaucoma and hypertensive eye disease. Normal intraocular pressure fluctuates between 10 mmHg and 21 mmHg. If the intraocular pressure is elevated, it is usually caused by one of the following two conditions: 1. caused by glaucoma, glaucoma is usually caused by abnormal development of structures such as the atrial angle and trabecular meshwork of the eye, or trauma to the eye, long-term use of hormone eye drops, etc., resulting in an increase in resistance to atrial fluid circulation within the eye, and a large amount of aqueous humor accumulates inside the eye, which will cause the intraocular pressure to rise. The high intraocular pressure will compress the optic nerve and cause optic nerve atrophy and visual field defects. 2. Hyperosmia. Often the patient is born with hypertension, but it is not detected by an ophthalmologic examination at the time. It is usually caused by corneal thickness greater than normal, most of which will not cause pressure on the optic nerve, and very few of which will cause damage to the eye function. It is recommended that patients with ocular discomfort go to the hospital in a timely manner to have their condition evaluated by a doctor and receive standardized treatment.