Intraocular pressure 20 belongs to a kind of normal high state, generally speaking is normal, but does not exclude the existence of disease, need to improve the examination to determine. Intraocular pressure refers to the pressure of the contents of the eyeball on the wall of the eyeball, mainly produced by the aqueous humor, vitreous humor, etc., and the aqueous humor circulation has a greater impact on intraocular pressure. Clinically, intraocular pressure of 10~21mmHg is considered normal. Therefore, intraocular pressure 20 belongs to the normal high level and is generally considered normal. Clinically, there exists a kind of normal intraocular pressure glaucoma, which refers to a kind of ophthalmic disease that the intraocular pressure does not exceed 21mmHg within 24 hours without using any intraocular pressure-lowering medication, but there is a kind of clinical symptom such as optic disc damage and visual field defects. Patients are advised to go to the hospital regularly to have their intraocular pressure, visual field and fundus checked for early detection of problems.