What to Expect During Angle-Closure Glaucoma

Angle-closure glaucoma is a serious eye condition where the drainage angle in your eye suddenly narrows or closes, causing a rapid increase in eye pressure. This can lead to sudden vision loss if not treated quickly. Treatment aims to open the drainage angle and lower eye pressure to prevent permanent damage to the optic nerve.

What is What to Expect During Angle-Closure Glaucoma?

Angle-closure glaucoma is an emergency eye condition that occurs when the drainage angle of your eye becomes blocked, leading to a sudden and significant rise in internal eye pressure (intraocular pressure or IOP). This blockage prevents fluid from draining properly, which can quickly damage the optic nerve and cause irreversible vision loss if not treated promptly.

Your eye constantly produces a clear fluid called aqueous humor. This fluid normally drains out through a mesh-like channel called the drainage angle, located where the iris (the colored part of your eye) meets the cornea (the clear front surface of your eye). In angle-closure glaucoma, this drainage angle suddenly narrows or closes. When the drainage angle closes, the aqueous humor cannot exit the eye, causing pressure to build up rapidly. This sudden increase in intraocular pressure (IOP) can damage the optic nerve, which transmits visual information from your eye to your brain. Symptoms often include severe eye pain, blurred vision, redness, halos around lights, headache, nausea, and vomiting. Immediate medical attention is crucial to preserve your vision.

Why it's done

Treatment for angle-closure glaucoma is performed to quickly lower the dangerously high eye pressure and open the blocked drainage angle. This urgent intervention is essential to prevent further damage to the optic nerve, which can lead to permanent vision loss. The goal is to restore proper fluid drainage and stabilize eye pressure.

The primary reason for treating angle-closure glaucoma is to protect your vision. High intraocular pressure (IOP) can rapidly and irreversibly damage the optic nerve, leading to blind spots and, eventually, complete blindness. By opening the drainage angle, medical professionals can allow the aqueous humor to flow out of the eye normally, reducing the pressure. Early and effective treatment can relieve symptoms such as severe eye pain, headache, and blurred vision. While treatment can prevent further vision loss, it cannot restore vision already lost due to optic nerve damage. Therefore, prompt diagnosis and intervention are critical to preserving as much vision as possible.

How to prepare

Preparing for angle-closure glaucoma treatment involves following specific instructions from your eye care team, often on an urgent basis. You may need to stop eating or drinking for several hours before certain procedures. It's important to discuss all medications you are currently taking with your doctor, as some may need to be adjusted or temporarily stopped.

Before your procedure, your doctor will conduct a thorough eye examination and may perform tests to measure your eye pressure and assess the drainage angle. These tests help determine the best course of treatment. You should inform your doctor about any allergies you have, especially to medications or anesthesia. If you wear contact lenses, you will be instructed to remove them before the procedure. Arrange for someone to drive you home afterward, as your vision may be temporarily blurred, and you may receive sedating medications. Follow all pre-operative instructions carefully to ensure the safest and most effective outcome.

What happens during

During treatment for angle-closure glaucoma, medical professionals will first work to lower your eye pressure using medications. Once the pressure is somewhat controlled, a procedure such as laser iridotomy is typically performed. This involves creating a tiny hole in your iris to improve fluid drainage and prevent future blockages.

Initial treatment often involves eye drops, oral medications, or intravenous (IV) drugs to quickly reduce the intraocular pressure (IOP). These medications help to shrink the iris or reduce fluid production, temporarily opening the drainage angle. Once the immediate crisis is managed, a common procedure is a laser peripheral iridotomy. During this outpatient procedure, a laser creates a small hole in the iris (the colored part of your eye). This hole acts like a new bypass, allowing fluid to flow more freely from the back of the iris to the front of the eye, where it can access the drainage angle. This helps to pull the iris away from the drainage angle, preventing future blockages. In some cases, if laser treatment is not sufficient or if the angle closure is due to a large cataract (clouding of the eye's natural lens), cataract extraction surgery may be performed. Removing the cataract can create more space in the eye and open the drainage angle. Rarely, other surgical procedures like trabeculectomy may be considered if laser treatment fails to control pressure.

Recovery & timeline

Recovery after angle-closure glaucoma treatment, such as a laser iridotomy, is usually quick, with most people resuming normal activities within a day or two. You may experience mild discomfort, light sensitivity, or temporary blurred vision. Your doctor will prescribe eye drops to prevent infection and reduce inflammation, and you will need follow-up appointments to monitor your eye pressure.

Immediately after a laser iridotomy, you might feel a slight ache in your eye or notice some temporary blurriness. Your doctor will check your eye pressure shortly after the procedure. You will typically be prescribed anti-inflammatory eye drops for about a week to help with healing and prevent complications. It is important to use these eye drops as directed and attend all follow-up appointments. These visits allow your doctor to monitor your eye pressure and ensure the drainage angle remains open. While the physical recovery is fast, ongoing monitoring is crucial to manage glaucoma long-term and prevent recurrence. You should avoid rubbing your eyes and strenuous activities for a few days, as advised by your doctor.

Risks & side effects

While angle-closure glaucoma treatments are generally safe and effective, like any medical procedure, they carry some potential risks and side effects. These can include temporary blurred vision, mild eye discomfort, or inflammation. More serious but rare complications might involve a temporary increase in eye pressure, bleeding, or the need for additional procedures.

Common side effects after a laser iridotomy are usually mild and temporary. You might experience some light sensitivity, a foreign body sensation in your eye, or a temporary increase in intraocular pressure (IOP) immediately after the procedure. These typically resolve within a short period. Less common risks include inflammation of the iris (iritis), bleeding inside the eye, or damage to the cornea or lens. In rare instances, the laser hole might close, requiring a repeat procedure. There is also a small risk of developing glare or seeing a new light streak, though this is uncommon. Your doctor will discuss all potential risks with you before the procedure and monitor you closely afterward.

Success rate

The success rate for treating acute angle-closure glaucoma is generally high, especially with prompt intervention. Laser iridotomy, the most common treatment, is effective in preventing future acute attacks in a large majority of people. While it can prevent further vision loss, it does not reverse existing damage.

For acute angle-closure glaucoma, immediate medical and laser treatment is highly effective in lowering eye pressure and preventing further damage. Sources indicate that laser peripheral iridotomy successfully opens the drainage angle and prevents future acute attacks in most cases. However, some individuals may still require ongoing medication to manage their eye pressure. It's important to understand that while treatment can prevent additional vision loss, any vision already lost due to optic nerve damage from the initial high pressure cannot be restored. Regular follow-up appointments are crucial to monitor eye pressure and ensure the treatment remains effective. In some instances, additional procedures or long-term eye drops may be necessary to maintain optimal eye health.

Frequently asked questions

Can angle-closure glaucoma be cured?

Angle-closure glaucoma cannot be cured, but it can be effectively managed and controlled. Treatment aims to prevent future acute attacks and preserve your remaining vision by lowering eye pressure and keeping the drainage angle open. You will likely need ongoing monitoring and possibly long-term treatment.

How quickly does angle-closure glaucoma cause blindness?

Acute angle-closure glaucoma can cause significant and irreversible vision loss very quickly, sometimes within hours, if not treated immediately. The rapid rise in eye pressure can severely damage the optic nerve. Prompt medical attention is crucial to minimize damage.

Will I need surgery for angle-closure glaucoma?

Many cases of angle-closure glaucoma are treated with a laser procedure called laser iridotomy, which is not considered traditional surgery. In some situations, if laser treatment is insufficient or if a cataract is contributing to the condition, surgical procedures like cataract extraction or trabeculectomy may be necessary.

What are the long-term effects of angle-closure glaucoma?

Even after successful treatment, individuals with angle-closure glaucoma may have a higher risk of developing chronic (long-term) glaucoma in the treated eye or the other eye. Regular eye exams and lifelong monitoring of eye pressure are essential to detect and manage any ongoing issues and prevent further vision loss.

Can angle-closure glaucoma affect both eyes?

Yes, angle-closure glaucoma can affect one or both eyes. Even if only one eye experiences an acute attack, the other eye is often at risk and may be treated preventatively with a laser iridotomy to reduce the chance of a future attack.

What should I do if I suspect I have angle-closure glaucoma?

If you experience sudden severe eye pain, blurred vision, redness, halos around lights, headache, nausea, or vomiting, seek immediate emergency medical attention. These are symptoms of acute angle-closure glaucoma, and prompt treatment is critical to prevent permanent vision loss.

Sources

• MedlinePlus — What to Expect During Angle-Closure Glaucoma
• Mayo Clinic — What to Expect During Angle-Closure Glaucoma
• Cochrane Library — What to Expect During Angle-Closure Glaucoma