Under normal circumstances, the IOP value should be between 8-21 mmHg, which is the normal IOP range. If the IOP is 30mmHg, it means that there is an elevated IOP, which may cause pressure on the optic nerve and lead to optic nerve damage and optic nerve atrophy over time, so the impact on the eye is still relatively serious. Once this happens, you need to go to the hospital as soon as possible to improve the glaucoma related examination, including fundus examination, intraocular pressure examination, visual field examination, optic nerve fiber layer analysis, and give active IOP lowering treatment, only then can you avoid damage to the optic nerve tissue. However, there is one exception, there are a few people who have an IOP value of 30mmHg, but do not produce any manifestation of optic nerve damage, in this case it is possible to observe long-term follow-up, this condition is also called hyperopia.