The pressure inside the eye is known as the intraocular pressure, which is the equalized pressure exerted by the contents of the eye on the walls of the eye. The IOP in a normal person needs to be stable within a certain range so that the normal shape of the eye and the visual function of the eye can be maintained. The range of normal IOP is 1.47 to 2.79 kPa (11 to 21 mmHg). IOP is mainly the pressure of the three eye contents, atrial fluid, lens and vitreous humor, acting on the inner wall of the eye. Only by maintaining a normal range of intraocular pressure can we maintain the normal near spherical shape of the eye and keep a constant and precise distance between each refractive media interface and the retina in order to obtain a good refractive state. If the IOP increases, it will break the balance of various parts of the eye, thus causing eye disease, the most common disease is glaucoma, eye swelling and pain, and individual patients will have nausea, vomiting, headache and other symptoms, or no symptoms If the IOP increases or decreases, it is a disease, you need to go to the hospital ophthalmology examination in time to see what causes it in order to treat the symptoms, you need to be under clinical The treatment should be under the guidance of a doctor, and surgery may be required if necessary.