Elevated Eye Pressure – Causes, Symptoms & Treatment
Elevated eye pressure, or ocular hypertension, refers to an intraocular pressure above the normal range. It is a key risk factor for developing glaucoma and requires regular monitoring.
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Elevated eye pressure, or ocular hypertension, refers to an intraocular pressure above the normal range. It is a key risk factor for developing glaucoma and requires regular monitoring.
What Is Elevated Eye Pressure?
Elevated eye pressure, medically known as ocular hypertension, occurs when the pressure inside the eye – the intraocular pressure (IOP) – rises above the normal range of approximately 10 to 21 mmHg. This pressure is regulated by the production and drainage of aqueous humor, a clear fluid that circulates within the eye. When the balance between production and drainage is disrupted, intraocular pressure can increase to potentially harmful levels.
Causes
Elevated eye pressure can result from several factors:
- Impaired aqueous humor drainage: The most common cause is a blockage or dysfunction of the trabecular meshwork, the drainage system of the eye located at the chamber angle.
- Overproduction of aqueous humor: In rarer cases, the ciliary body produces excessive amounts of fluid.
- Medications: Corticosteroid eye drops or systemic steroids are known to increase intraocular pressure.
- Eye conditions: Uveitis (eye inflammation), eye injuries, or pseudoexfoliation syndrome can affect drainage and pressure.
- Genetic predisposition: A family history of ocular hypertension or glaucoma increases the risk.
Symptoms
In most cases, elevated eye pressure causes no noticeable symptoms. Patients typically experience no pain and no change in vision until optic nerve damage has already occurred. The exception is an acute angle-closure glaucoma attack – a medical emergency – which presents with sudden severe eye pain, nausea, vomiting, blurred vision, and halos around lights.
Diagnosis
Because elevated eye pressure is usually asymptomatic, regular eye examinations are critical for early detection. Common diagnostic methods include:
- Tonometry: Measurement of intraocular pressure; Goldmann applanation tonometry is considered the gold standard.
- Perimetry (visual field testing): Detects any existing visual field defects caused by optic nerve damage.
- Ophthalmoscopy (optic disc assessment): Evaluates the optic nerve head for glaucomatous changes.
- Pachymetry: Measures central corneal thickness, which influences the accuracy of IOP readings.
- Gonioscopy: Examines the chamber angle to differentiate between open-angle and angle-closure mechanisms.
Treatment
Not every case of elevated eye pressure requires immediate treatment. The decision depends on the level of pressure, associated risk factors, and the individual risk of developing glaucoma.
Medications
Eye drops are the most common first-line treatment. The main classes of medications used include:
- Prostaglandin analogues (e.g., latanoprost): Increase aqueous humor outflow.
- Beta-blockers (e.g., timolol): Reduce aqueous humor production.
- Carbonic anhydrase inhibitors (e.g., dorzolamide): Decrease fluid production in the eye.
- Alpha-2 agonists (e.g., brimonidine): Act on both production and drainage of aqueous humor.
Laser Treatment
Selective laser trabeculoplasty (SLT) uses targeted laser energy to improve aqueous humor outflow through the trabecular meshwork. It can be used as an alternative or complement to eye drop therapy.
Surgical Treatment
If medications and laser therapy are insufficient, surgical procedures such as trabeculectomy or the implantation of drainage devices may be considered to create new pathways for fluid drainage.
Risks and Complications
Persistently elevated intraocular pressure is the most significant known risk factor for the development of glaucoma. In glaucoma, the optic nerve is progressively damaged by the elevated pressure, potentially leading to irreversible visual field loss and, in severe cases, blindness. Regular follow-up with an ophthalmologist is therefore essential for all individuals with elevated eye pressure.
References
- European Glaucoma Society (EGS): Terminology and Guidelines for Glaucoma, 5th Edition, 2020. Available at: https://www.eugs.org
- Weinreb R.N., Aung T., Medeiros F.A. – The Pathophysiology and Treatment of Glaucoma: A Review. JAMA. 2014;311(18):1901-1911.
- Kanski J.J., Bowling B. – Clinical Ophthalmology: A Systematic Approach. 8th Edition. Elsevier, 2016.
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