{"id":91596460052,"date":"2025-09-01T09:31:12","date_gmt":"2025-09-01T07:31:12","guid":{"rendered":"https:\/\/www.augenarzt-banyai.de\/blog\/general\/intraocular-pressure-simply-explained-what-do-the-values-mean-dr-med-banyai-explains\/"},"modified":"2026-06-18T16:13:46","modified_gmt":"2026-06-18T14:13:46","slug":"intraocular-pressure-simply-explained-what-do-the-values-mean-dr-med-banyai-explains","status":"publish","type":"post","link":"https:\/\/www.augenarzt-banyai.de\/en\/blog\/glaucoma\/intraocular-pressure-simply-explained-what-do-the-values-mean-dr-med-banyai-explains\/","title":{"rendered":"Intraocular pressure, simply explained: What do the values mean? Dr. med. B\u00e1nyai explains"},"content":{"rendered":"\n

Intraocular pressure \u2014 medically abbreviated IOP and also called tensio \u2014 is a central measurement in ophthalmology.<\/p>\n\n

But what exactly does this value indicate? When is it considered elevated? And what does that mean for the risk of glaucoma (green star)? We at B\u00e1nyai Augenheilkunde clearly explain what matters in the assessment and why it’s worth knowing your eye measurements.<\/p>\n\n

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Glaucoma \u2013 learn more<\/a><\/div>\n<\/div>\n\n

What is normal intraocular pressure?<\/h2>\n\n

The normal intraocular pressure in most people is between 10 and 21 mmHg<\/strong> (millimetres of mercury). It results from the aqueous humour in the eye \u2013 a clear fluid that is continuously produced and drained through fine channels.\u00a0<\/p>\n\n

If this balance is disrupted, pressure can build up inside the eye. This pressure regulation is essential for nourishing the internal structures of the eye and for maintaining vision.<\/p>\n\n

When is intraocular pressure considered elevated?<\/h2>\n\n

If the measured pressure exceeds 21 mmHg, specialists refer to it as an elevated intraocular pressure<\/strong>. If this persists without any detectable damage to the optic nerve or visual field, it is referred to as ocular hypertension<\/strong>.\u00a0<\/p>\n\n

However, this does not necessarily mean that a disease such as glaucoma<\/strong> is present. What matters is how sensitive the optic nerve is to pressure.<\/p>\n\n

Some people tolerate slightly elevated eye pressure well, while others can develop damage even at “normal” pressure (normal-tension glaucoma). Therefore, an individual assessment by an ophthalmologist is indispensable.<\/p>\n\n

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Intraocular pressure \u2013 further information<\/a><\/div>\n<\/div>\n\n

Why is intraocular pressure so important in glaucoma?<\/h2>\n
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A persistently elevated intraocular pressure is one of the most important risk factors for glaucoma<\/strong> \u2014 a chronic condition in which the optic nerve is progressively damaged.\u00a0<\/p>\n\n

If left untreated, this can lead to visual field loss and, in the worst case, blindness. The good news is that if glaucoma is detected early, its progression can often be halted.<\/p>\n\n

Early diagnosis and targeted treatment\u2014medication-based, laser-based, or surgical\u2014can protect the optic nerve and preserve quality of life.<\/p>\n\n

How is glaucoma diagnosed?<\/h2>\n\n

A glaucoma diagnosis is not based on a single measurement but on a combination of several tests.<\/p>\n\n

Tonometry measures intraocular pressure, either non-contact using an air puff<\/strong> or more precisely with applanation tonometry<\/strong>. This method is performed under local anesthesia and provides particularly reliable measurements.<\/p>\n\n

In addition, OCT (optical coherence tomography)<\/strong> is used. It enables high-resolution imaging of the nerve fiber layer and the optic nerve head.\u00a0<\/p>\n\n

This makes it possible to detect even the smallest structural changes early \u2013 before any functional limitations become noticeable.<\/p>\n\n

Another component is the visual field test (perimetry)<\/strong>. This test checks whether and where the visual field is restricted.\u00a0<\/p>\n\n

Many patients do not initially notice such deficits, and perimetry provides objective evidence of early or progressive damage.<\/p>\n\n

In addition, individual factors such as corneal thickness (pachymetry), diurnal pressure fluctuations, and the course observed across multiple follow-up appointments are taken into account in the assessment. Only by combining these elements can a reliable picture of eye health be formed.<\/p>\n\n

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OCT vs. Visual Field \u2013 Simply Explained<\/a><\/div>\n<\/div>\n\n

What treatment options are available for glaucoma?<\/h2>\n
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The goal of any glaucoma treatment is to lower intraocular pressure permanently and relieve pressure on the optic nerve.<\/p>\n\n

Therapy often begins with eye drops. These either reduce aqueous humor production or improve its drainage.<\/p>\n\n

Depending on the individual case, different classes of medication may be used \u2013 such as prostaglandin analogues<\/a>, beta-blockers, or carbonic anhydrase inhibitors.<\/p>\n\n

Laser treatment can be beneficial for certain types of glaucoma. Selective laser trabeculoplasty (SLT)<\/strong> is an established procedure that specifically targets the trabecular meshwork in the eye and thereby improves the outflow of aqueous humor. SLT can be used as an adjunct to, or as an alternative to, eye-drop therapy.<\/p>\n\n

If this is not sufficient, surgical procedures offer an effective solution. The classic trabeculectomy<\/strong> creates an artificial drainage pathway for the aqueous humor.\u00a0<\/p>\n\n

In many cases, minimally invasive glaucoma surgery (MIGS) or combined cataract surgery is also considered \u2014 especially if lens opacity is present at the same time.<\/p>\n\n

These procedures not only lower pressure but also often improve the quality of vision.<\/p>\n\n

In addition to medical treatment, lifestyle factors should not be overlooked.<\/p>\n\n

Reducing stress, getting enough sleep, exercising regularly, and taking prescribed medications as directed support successful treatment.<\/p>\n\n

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More information on glaucoma surgery<\/a><\/div>\n<\/div>\n\n

How often should the intraocular pressure be measured?<\/h2>\n\n

We recommend regular eye examinations\u2014especially starting at age 40 or if you have known risk factors such as:<\/p>\n

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