Measurement of intraocular pressure (IOP), there are two types of IOP measurement, the former is to estimate IOP by finger touch, the latter is to use a machine to measure IOP, of which non-contact IOP measurement is more common. In acupressure measurement, the doctor touches the patient’s eyelid with his index finger and feels the pressure on the eyeball directly to estimate the level of intraocular pressure. It is usually compared with the feeling of touching the lips, tip of the nose and forehead with the finger. A touch as if pressing the lips indicates low pressure, and if touching the forehead, high pressure. The tonometer measures intraocular pressure (IOP) and gives a more accurate value of IOP. The most widely used clinically is the non-contact tonometer, where the patient is positioned in the prescribed position and the tonometer ejects established air into the cornea, and the airflow pressure and other conditions are detected in order to arrive at an accurate IOP value. To check the intraocular pressure, three measurements are usually taken and the average value of intraocular pressure is obtained as a reference. Patients with abnormal intraocular pressure are advised to seek prompt medical attention to assess their condition and follow medical advice.