Increased Intraocular Pressure - Causes, Treatment & When to See a Doctor

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What is Increased Intraocular Pressure?

Increased intraocular pressure (IOP), also known as ocular hypertension, occurs when the pressure inside the eye rises above normal levels. The eye constantly produces a clear fluid called aqueous humor, which flows out through a drainage system. When this fluid doesn’t drain correctly, pressure builds up. While high IOP doesn’t always cause symptoms, it’s a key risk factor for glaucoma—a group of eye conditions that damage the optic nerve and can lead to vision loss. According to the Mayo Clinic, normal IOP ranges from 10 to 21 mmHg. Persistently elevated levels above 21 mmHg may require medical attention.

Common Causes

Several conditions or situations can lead to increased IOP. Here are some of the most common causes:

• Open-angle glaucoma: A chronic condition where drainage of aqueous humor is slowly compromised, often due to structural changes in the eye’s angle.
• Acute angle-closure glaucoma: A medical emergency caused by a sudden blockage of the eye’s drainage angle, often triggered by a narrow angle or ongoing use of dilating eye drops.
• Eye injuries or surgeries: Trauma or past surgical procedures can damage the drainage system.
• Infections: Conditions like uveitis (inflammation of the eye’s middle layer) or keratitis (corneal infection) may increase IOP.
• High blood pressure: Chronic hypertension can affect blood flow to the optic nerve, sometimes elevating IOP.
• Diabetes: Poorly controlled diabetes may impair eye fluid dynamics due to vascular changes.
• Steroid medications: Long-term use of corticosteroids (oral or injected) is known to raise IOP in some individuals.
• Angle-recession injury: A past surgical cut near the cornea can scar and narrow the drainage angle.
• Pupillary block: In nearsighted individuals, the iris may bulge toward the lens, restricting fluid drainage.
• Congenital glaucoma: Present in infants due to abnormal drainage system development.

Associated Symptoms

High IOP often has no symptoms in its early stages, which is why regular eye exams are critical. However, in acute cases or advanced glaucoma, individuals may experience:

• Severe eye pain or headache: Common in acute angle-closure glaucoma.
• Blurred vision: Sudden or gradual clouding of vision.
• Nausea or vomiting: Often linked to the body’s response to intense eye pressure.
• Redness or twitching of the eye: Sign of inflammation or irritation.
• Halos around lights: A sign of peripheral vision loss in chronic glaucoma.
• Eye drainage or tearing: May occur in severe cases.

Note: Chronic cases like open-angle glaucoma may progress without noticeable symptoms until significant optic nerve damage occurs.

When to See a Doctor

You should seek immediate medical care if you experience:

• Sudden, severe eye pain.
• Blurred or double vision.
• Acute nausea or vomiting accompanied by eye symptoms.
• Signs of redness or light sensitivity.

Even if symptoms are mild, consult an eye specialist (ophthalmologist) if:

• You have a family history of glaucoma.
• You experience routine pressure spikes (e.g., after steroid use).
• You’re over 40, as age increases glaucoma risk.

The CDC emphasizes that early treatment is essential to prevent permanent vision loss.

Diagnosis

Doctors diagnose increased IOP through a combination of tests and evaluations:

1. Tonometry: Measures IOP directly using devices like the Goldmann applanation tonometer (per National Eye Institute).
2. Slit-lamp examination: A detailed look at the eye’s structures to check for drainage issues or angle blockages.
3. Visual field test: Assesses peripheral vision to detect early glaucoma damage.
4. Optic nerve assessment: Examines the optic nerve for thinning (cupping), a sign of nerve damage.

Additional imaging, such as optical coherence tomography (OCT), may be used to evaluate retinal health and nerve fibers.

Treatment Options

Treatment depends on whether the elevated IOP is chronic or acute:

• Medicated eye drops:
  • Beta-blockers (e.g., timolol) reduce fluid production.
  • Prostaglandin analogs (e.g., latanoprost) improve drainage.
  • Alpha agonists (e.g., brimonidine) lower pressure by constricting the pupil.
  • Carbonic anhydrase inhibitors (e.g., dorzolamide) decrease fluid production.
• Laser therapy: Procedures like trabeculoplasty enhance drainage or cyclopegation repairs angle blockages.
• Surgery:
  • Trabeculectomy: Creates a new drainage channel.
  • Drainage implants: Shunts fluid away from the eye (e.g., Ahmed valve, iStent).
• Lifestyle measures: Avoid eye strain (e.g., prolonged screen time), follow prescribed regimens strictly, and use protective eyewear during sports. Patients should never adjust medications without medical advice.

For acute cases (e.g., angle-closure glaucoma), emergency treatments like laser iridotomy or immediate surgery may be necessary to restore drainage.

Prevention Tips

While not all causes of high IOP can be prevented, these steps can reduce risk:

• Regular eye exams: Adults should have a comprehensive exam every 1–2 years, especially after age 40 or if risk factors exist.
• Manage systemic conditions: Control hypertension, diabetes, and cholesterol to protect ocular health.
• Limit steroid use: Discuss alternatives with your doctor if long-term steroid medication is required.
• Avoid known triggers: For example, prolonged use of dilating eye drops or contact lens wear if advised against.
• Know your family history: Glaucoma and other IOP-related conditions often run in families.

The World Health Organization highlights that early detection through routine screenings is the most effective prevention strategy.

Emergency Warning Signs

Remember, even if symptoms seem minor, high IOP should never be ignored. Early treatment significantly improves outcomes. Always consult a healthcare provider for personalized advice.

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