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Intraocular Pressure: Causes, Measurement & Treatment

Intraocular pressure refers to the fluid pressure inside the eye. Elevated levels are a key risk factor for glaucoma and can lead to permanent vision loss if left untreated.

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Things worth knowing about "Intraocular Pressure"

Intraocular pressure refers to the fluid pressure inside the eye. Elevated levels are a key risk factor for glaucoma and can lead to permanent vision loss if left untreated.

What Is Intraocular Pressure?

Intraocular pressure (IOP) is the fluid pressure inside the eye, maintained by a clear fluid called aqueous humor. This fluid is continuously produced by the ciliary body, circulates through the anterior chamber of the eye to nourish the lens and cornea, and drains out through the trabecular meshwork into the Schlemm canal. The balance between production and drainage of aqueous humor determines the intraocular pressure.

In healthy adults, normal IOP ranges between 10 and 21 mmHg (millimeters of mercury). Values above 21 mmHg are considered elevated (ocular hypertension) and represent a significant risk factor for glaucoma – a group of eye conditions that damage the optic nerve. Chronically elevated pressure can lead to progressive and often painless vision loss.

Causes of Elevated Intraocular Pressure

In most cases, elevated IOP results from impaired drainage of aqueous humor. Common causes include:

Primary open-angle glaucoma: The most common form – the drainage angle appears open but resistance to outflow is increased.
Angle-closure glaucoma: The drainage angle between the iris and cornea is narrowed or blocked.
Secondary glaucoma: Triggered by other conditions such as diabetes, eye inflammation, or trauma.
Long-term use of corticosteroids: Certain medications, particularly corticosteroid eye drops, can raise IOP.
Genetic predisposition: A family history of elevated IOP or glaucoma increases the risk.

Symptoms

Mildly to moderately elevated IOP generally causes no pain and often goes unnoticed. Symptoms typically appear only in more advanced stages of glaucoma and may include:

Visual field loss (tunnel vision)
Blurred vision
Sensitivity to light
Headaches or eye pain (especially during an acute glaucoma attack)
Nausea and vomiting (during an acute glaucoma attack)

An acute angle-closure glaucoma attack is a medical emergency characterized by a sudden sharp rise in IOP, severe eye pain, sudden vision loss, and a red eye. Immediate medical attention is required.

Diagnosis

IOP is measured by an ophthalmologist using a procedure called tonometry. Common methods include:

Goldmann applanation tonometry: The gold standard – a small probe gently touches the anesthetized cornea to measure resistance.
Non-contact tonometry (air-puff): A brief puff of air is directed at the cornea – no contact or anesthesia required.
Perimetry: Visual field testing to detect characteristic glaucoma-related field defects.
Optic disc evaluation: Examination of the optic nerve head for signs of damage.
OCT (Optical Coherence Tomography): Imaging to assess the thickness of the retinal nerve fiber layer.

Since IOP can fluctuate throughout the day, multiple measurements at different times of day may be recommended.

Treatment

The goal of treatment is to lower IOP to a level that protects the optic nerve from further damage. Treatment options include:

Eye Drops

Pressure-lowering eye drops are the most common first-line treatment. Key drug classes include:

Prostaglandin analogs (e.g., latanoprost): Increase aqueous humor outflow.
Beta-blockers (e.g., timolol): Reduce aqueous humor production.
Carbonic anhydrase inhibitors (e.g., dorzolamide): Decrease aqueous humor production.
Alpha-2 agonists (e.g., brimonidine): Both reduce production and enhance drainage.

Laser Treatment

Selective laser trabeculoplasty (SLT) uses targeted laser pulses to improve drainage through the trabecular meshwork. It is a suitable option when eye drops are insufficient or poorly tolerated.

Surgery

If medication and laser therapy do not adequately control IOP, surgical intervention may be necessary. Options include trabeculectomy (creating a new drainage pathway) or implantation of micro-drainage devices (MIGS – minimally invasive glaucoma surgery).

Prevention and Recommendations

Since elevated IOP often causes no symptoms for years, regular eye examinations are essential – particularly for high-risk groups:

Adults over the age of 40
Individuals with a family history of glaucoma in first-degree relatives
People with diabetes mellitus or high blood pressure
People with significant myopia (nearsightedness)
Long-term users of corticosteroid medications

Most ophthalmological societies recommend routine eye check-ups from the age of 40, ideally every one to two years.

References

European Glaucoma Society (EGS): Terminology and Guidelines for Glaucoma, 5th Edition. PubliComm, 2021.
Weinreb R.N., Aung T., Medeiros F.A.: The Pathophysiology and Treatment of Glaucoma – A Review. JAMA, 2014; 311(18): 1901-1911.
World Health Organization (WHO): Priority eye diseases – Glaucoma. Available at: https://www.who.int/blindness/causes/priority/en/index6.html

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