I recently measured the IOP continuously between 18-23 (the kind of IOP meter that looks at a green light in the middle, and the doctor presses a button and a stream of air hits the eye), is it glaucoma? 1. The commonly used methods of measuring IOP are pneumatic IOP, pressure trapping IOP and pressure leveling IOP. The measurement method you are using is non-contact pneumatic IOP, which is simple and fast, and very suitable for general screening, but slightly less accurate. In clinical practice we often encounter patients with high pneumatic IOP, some even around 30, but normal pressure flat IOP. The measurement value of indentation IOP is also susceptible to some factors. And indentation IOP is currently the most accurate measurement method recognized internationally. Therefore, those who have high IOP measured by other tonometers should review the pressure-flat IOP and monitor the 24-hour IOP daily curve (pressure-flat IOP measurement) if necessary to see if the IOP is high or not. 2, In addition, you need to look at the thickness of the cornea, if too thick will make the pressure level IOP measurement high. 3, the most critical point in diagnosing glaucoma is the assessment of the fundus optic papilla and visual function (mainly visual field). If the pressure level IOP value is high, the cornea is not thick, and there is glaucomatous damage to the optic nerve visual field, it is likely to be glaucoma. However, there are some people who do not have high IOP but also have damage to the optic nerve and visual field, which may also be normal pressure glaucoma. 4. If the pressure level is high and the optic nerve is not damaged, the measurement may be high due to a thick cornea, or it may be hypertensive. If it is high IOP, you should see if treatment is needed according to the degree of high IOP and review it regularly, these people are more likely to occur as glaucoma than average.