Who Needs to Know Regarding This Emergency
Anyone can experience an acute angle-closure attack, but certain groups face a higher risk. If you fall into any of these categories, learning the details of this emergency is especially important for you and your loved ones.
- Adults older than forty, particularly those older than sixty, as the lens of the eye grows thicker with age and can push the iris forward
- Women, who are affected by angle-closure glaucoma at higher rates than men
- People of Asian or East Asian descent, who tend to have naturally shallower anterior chambers in the eye
- People of Inuit or Native Alaskan heritage, who also have higher rates of this condition
- Individuals who are farsighted, also called hyperopic, because farsighted eyes tend to be shorter with shallower drainage angles
If someone in your family has narrow angles or angle-closure glaucoma, you should learn the details of this condition. Family members and caregivers play a key role in spotting symptoms and getting emergency help. A person in the middle of an acute attack may be in too much pain to drive or call for help.
Learning the symptoms ahead of time means you can act fast. You can help your loved one get to an emergency room or eye care professional right away, which can make a significant difference in the outcome.
Some medications can trigger an acute angle-closure attack in people who already have narrow drainage angles. If you take any of the following types of medications, talk to your eye doctor regarding your risk.
- Certain cold and allergy medications that contain decongestants or antihistamines
- Some antidepressants and anti-anxiety medications
- Medications used to treat motion sickness or nausea
- Some medications used during anesthesia before surgery
- Certain migraine medications
This does not mean you should stop taking prescribed medications without talking to your doctor. It does mean you should talk with both your prescribing doctor and your eye care provider to understand your personal level of risk.
During a routine eye exam, your eye doctor may tell you that you have narrow angles. This means the drainage angle in your eye is smaller than average. This puts you at higher risk for an angle-closure attack. If you have been told this, make sure you understand the symptoms and have a plan for getting emergency care.
Your eye doctor may recommend a preventive laser procedure to reduce your risk. Even if you have had this preventive treatment, staying informed on the warning signs remains a good idea.
Who Is at Risk for Angle-Closure Glaucoma
The natural aging process changes the eye in ways that increase the risk of angle-closure. As you get older, the lens inside your eye continues to grow. This growth pushes the iris forward toward the drainage angle. The iris is the colored part of your eye. Some people already have a shallow anterior chamber. The anterior chamber is the fluid-filled space between the cornea and the iris. In these people, age-related lens growth can narrow the drainage angle even further.
People older than fifty should have regular eye exams that include a check of the drainage angle. Your eye doctor can use a special lens called a gonioscope to look at the angle. This painless test takes only a few minutes. It can find people who may be at risk before an emergency occurs.
Research has shown that women develop angle-closure glaucoma at two to four times the rate of men. This may be related to differences in eye size and shape. Women tend to have slightly shorter eyes and shallower anterior chambers. This makes the drainage angle narrower.
Ethnic background also plays a role. People of Asian, East Asian, Inuit, and Native Alaskan descent have higher rates of angle-closure glaucoma. Open-angle glaucoma accounts for 90% of all glaucoma cases in the United States (National Eye Institute, 2023). But in Asian populations, angle-closure glaucoma makes up a larger share of cases.
Having a close family member with angle-closure glaucoma increases your own risk. A parent or sibling with this condition is a strong signal. Eye shape and the depth of the anterior chamber are partly set by genetics. If angle-closure glaucoma runs in your family, let your eye doctor know. They can watch your drainage angles more closely during your regular exams.
Even if no one in your family has been formally diagnosed with angle-closure glaucoma, a family history of any type of glaucoma is worth mentioning to your eye care provider. Some family members may have had the condition without knowing it.
People who are farsighted tend to have shorter eyeballs. Being farsighted means you can see distant objects more clearly than close ones. A shorter eye means less space inside the anterior chamber. This results in a narrower drainage angle. The more farsighted you are, the greater your risk may be.
If you wear glasses or contacts for farsightedness and you are older than forty, ask your eye doctor if your drainage angles are narrow. This simple question can start a key talk with your doctor regarding your risk.
Certain eye conditions can increase the risk of angle-closure. These include large cataracts, tumors or cysts behind the iris, and past eye injuries. Inflammation inside the eye, known as uveitis, can also cause the iris to stick to the lens. This can block the drainage angle.
If you have a history of eye disease or injury, let your eye care provider know. They can factor this into your risk for angle-closure glaucoma.
What Happens During an Angle-Closure Attack
To understand an acute attack, it helps to know how fluid moves in a healthy eye. The eye makes a clear fluid called aqueous humor. This fluid flows from behind the iris, through the pupil, and into the front chamber of the eye. It then drains out through a mesh-like channel called the trabecular meshwork. This channel sits at the drainage angle where the iris meets the cornea.
In an angle-closure attack, the iris bulges forward. It presses against the meshwork and blocks the drainage path. Fluid keeps being made but has nowhere to go. This causes eye pressure to rise fast. Doctors call this intraocular pressure. Normal eye pressure ranges from 10 to 21 millimeters of mercury. During an acute attack, it can spike to 40, 50, or even 70 within hours.
The symptoms of an acute attack are hard to ignore. They come on fast and get worse quickly. Knowing these symptoms can help you seek help right away.
- Sudden, severe pain in or around one eye that may spread to the forehead and temple area
- A severe headache, often on the same side as the affected eye
- Nausea and vomiting, which can sometimes be mistaken for a stomach illness or migraine
- Seeing halos or rainbow-colored rings around lights, especially at night
- Blurred or foggy vision that comes on suddenly
- Redness of the eye, caused by swollen blood vessels on the surface
- A fixed, mid-dilated pupil that does not respond normally to light
The nausea and vomiting can be so bad that some people think they have a stomach problem. If you have nausea along with eye pain or vision changes, tell the medical team right away.
When eye pressure stays very high for an extended period, it damages the optic nerve. The optic nerve is made up of more than a million tiny nerve fibers. Once these fibers are damaged, they do not grow back. The longer the pressure remains high, the more nerve fibers are lost. This leads to greater impact on your vision.
Treatment within the first few hours gives you the best chance of saving your vision. Delays of even a few hours can lead to significant and lasting damage. This is why acting fast is so critical. If you suspect an acute angle-closure attack, do not wait to see if the symptoms go away. Go to the nearest emergency room or call your eye doctor right away.
An acute attack can be triggered by situations that cause the pupil to dilate, or widen. When the pupil dilates in a person with narrow angles, it can push the iris into the drainage angle and block it. Common triggers include the following.
- Being in a dark room or watching a movie in a dark theater, which causes the pupil to widen
- Emotional stress or excitement, which can cause the pupil to dilate
- Certain medications, including eye drops used to dilate the pupils during an eye exam
- Cold or allergy medications containing ingredients like pseudoephedrine or certain antihistamines
- Reading or doing close work for long periods in dim lighting
Not every person with narrow angles will have an attack in these cases. Being aware of triggers can help you take steps to stay safe. If you know you have narrow angles, talk with your eye doctor.
If an acute attack is not treated promptly, the damage can worsen with each passing hour. In the early stages, the cornea becomes swollen and cloudy from the high pressure. This is why vision appears foggy or blurred. The iris may become inflamed and develop adhesions. Adhesions are areas where the iris sticks to other structures inside the eye.
As the pressure stays high, the blood supply to the optic nerve is reduced. Nerve fibers begin to die. This leads to patches of vision loss that start in the side vision. If the pressure is not brought under control, the damage can spread toward the center of your visual field. This is why seeking treatment as soon as symptoms begin is so important.
Treatment Options for Angle-Closure Glaucoma
The first step in treating an acute attack is to lower the eye pressure as quickly as possible. Doctors use medications to do this. These are given in the emergency room or at your eye doctor's office. Several types may be used together.
- Eye drops that constrict the pupil, pulling the iris away from the drainage angle to help open the blocked channel
- Eye drops that reduce fluid production inside the eye, helping to lower the pressure
- Oral medications or intravenous medications that draw fluid out of the eye to bring the pressure down quickly
- Pain medications and anti-nausea medications to help manage your symptoms while the pressure-lowering treatments take effect
These medications work to bring the pressure down quickly. The goal is to lower it within one to two hours so a laser procedure can be done safely.
Laser peripheral iridotomy is the standard treatment for acute angle-closure glaucoma. It is also used to prevent attacks in people with narrow angles. During this procedure, the doctor uses a focused laser beam to create a tiny hole in the outer edge of the iris. This small opening creates a new pathway for fluid to flow from behind the iris into the front chamber. It bypasses the blocked pupil area.
The procedure is typically performed in the doctor's office or a clinic setting. Here is what you can expect during a laser iridotomy.
- Numbing eye drops are placed in your eye so you do not feel pain during the procedure
- A special contact lens is placed on your eye to help focus the laser beam
- The laser creates one or two small openings in the iris, which takes only a few minutes
- You may see a bright flash of light and feel a mild pinching sensation
- Anti-inflammatory eye drops are given after the procedure to reduce swelling
The opening is very small. It is usually hidden under the upper eyelid, so others cannot see it. This procedure is very effective at relieving the blockage and preventing future attacks.
In some cases, laser iridotomy may not be enough. If the drainage angle was damaged by the acute attack, or if the pressure stays high after laser treatment, surgery may be needed.
- Trabeculectomy, which creates a new drainage path in the wall of the eye to let fluid flow out
- Glaucoma drainage implants, which are small devices placed in the eye to help fluid drain
- Lens extraction, also known as cataract surgery, which removes the natural lens and replaces it with a thinner one, making more room in the front chamber
Your eye doctor will discuss which option is best for you. This depends on the amount of damage to the drainage angle, your eye pressure, and your overall eye health.
After the emergency has been resolved, you may need to use eye drops on a regular basis. These drops keep your eye pressure at a safe level. They come in several types. Your doctor will choose the type or mix that works best for you.
Use your eye drops exactly as prescribed, even if you feel fine. High eye pressure often has no symptoms until major damage has occurred. Skipping doses or stopping your drops without your doctor's approval can put your vision at risk.
Your doctor may change your drops over time. Some patients do well with one type. Others may need two or three kinds to keep their pressure down.
If you have an acute attack in one eye, the other eye faces a high chance of a similar event. Both eyes often share the same narrow shape. Your doctor will likely recommend a preventive laser iridotomy on the other eye, even if it has not had an attack. This step can greatly reduce the risk of a second emergency.
Having the preventive procedure done on the fellow eye is considered one of the most important steps in your treatment plan.
What to Expect During and After Emergency Treatment
When you arrive at the emergency room with symptoms of an acute attack, the medical team will quickly check your condition. Tell them right away that you think you are having an eye emergency. They will check your eye pressure using a device called a tonometer. This device gently touches the surface of your eye after numbing drops have been applied. If your pressure is very high, treatment will begin right away.
The emergency room doctor may consult with an eye specialist called an ophthalmologist. This specialist may come to the emergency room or ask that you be moved to their office. In some cases, the laser iridotomy will be done the same day once medications have brought the pressure down enough.
During the first few hours, you will receive several medications to lower your eye pressure. You may be given eye drops every few minutes at first. You may also receive oral or IV medications. The medical team will check your eye pressure often to see how well the treatment is working.
You may feel groggy or lightheaded from the medications. The pain should start to decrease as the pressure comes down. Most patients feel much better within one to two hours of starting treatment. It can take longer in some cases. Your medical team will stay with you until the pressure reaches a safer level.
After a laser iridotomy, you can usually go home the same day. Your vision may be blurry for a few hours. Your eye may feel sore or sensitive to light. Your doctor will prescribe anti-inflammatory eye drops to use for several days.
Here is what to expect during your recovery period.
- Mild discomfort or a dull ache in the treated eye for one to two days
- Sensitivity to bright light, which can be managed by wearing sunglasses
- Slightly blurred vision that usually clears within a day or two
- A follow-up appointment within one to two weeks to check your eye pressure and the iridotomy site
Most people can return to normal activities within a day or two. Do not rub your eye. Follow all of your doctor's instructions for eye drops and rest.
Even after successful treatment, you will need ongoing monitoring of your eye health. Your eye doctor will want to see you regularly. They will check your eye pressure, examine your optic nerve, and test your visual field. Visual field testing measures your side vision to detect any areas of vision loss.
How often you visit depends on how well your pressure is controlled. It also depends on whether the optic nerve was damaged during the attack. In the first few months, you may need to see your eye doctor every few weeks. Over time, if your condition is stable, visits may become less frequent. They will still remain an important part of protecting your vision.
After your treatment and recovery, stay alert for any signs that something may need more attention. Contact your eye doctor right away if you notice any of the following.
- A return of severe eye pain, headache, or nausea
- Sudden changes in your vision, such as new blurriness or fogginess
- Seeing new halos around lights
- Increased redness in the treated eye
- Any concerns regarding how your eye is healing
These symptoms do not necessarily mean something serious is happening. They should be checked promptly. Catching new or worsening symptoms early helps your doctor address issues before they get worse.
Your Journey at Washington Eye Institute
At Washington Eye Institute, your care begins with a thorough check of your eye health. Your doctor will use advanced imaging to examine the structures inside your eye. They will measure your eye pressure and assess the width of your drainage angles. This evaluation helps your care team understand your eye shape and create a treatment plan for your needs.
If you come to us during an acute emergency, our team is ready to act fast. We know that time is critical during an angle-closure attack. We focus on getting your pressure under control as fast as possible. Our goal is to protect your vision and ease your pain from the moment you arrive.
Every patient's eyes are different. Your treatment plan at Washington Eye Institute will reflect your unique situation. Your doctor will explain all of your options clearly and answer your questions. Whether you need emergency laser treatment, preventive care for narrow angles, or ongoing glaucoma management, your care team will work with you to find the best approach.
We take the time to discuss the benefits and risks of each option. Your input matters, and we want you to feel sure of the plan we make together.
Managing angle-closure glaucoma is an ongoing process. Washington Eye Institute is here to support you through every phase. Our team will teach you how to use your eye drops. We will help you understand your condition. We will make sure you know what signs to watch for between visits.
We believe that informed patients make the best decisions for their health. Your care team will explain test results and discuss any changes in your condition. They will adjust your treatment plan as needed. You are an active partner in your eye care, and we are here to support you.
Washington Eye Institute uses modern diagnostic and treatment tools to provide top-level care. Our imaging systems let your doctor see detailed views of the drainage angle, the optic nerve, and other key structures. This technology helps us detect problems earlier and track your condition over time.
Our team stays current with the latest developments in glaucoma treatment to bring you the best possible outcomes.
Questions and Answers on Acute Angle-Closure Glaucoma
If you experience sudden, severe eye pain along with blurred vision, headache, nausea, or halos around lights, seek emergency medical care right away. Do not wait to see if the symptoms improve on their own. Go to the nearest emergency room and tell the staff you are having an eye emergency. Have someone else drive you if possible, as your vision may be impaired. Time is one of the most important factors in protecting your eyesight.
While you cannot change the shape of your eye, there are steps you can take to lower your risk. The most effective preventive step is a laser iridotomy. Your doctor may recommend this if you have narrow drainage angles. This quick procedure creates an extra drainage pathway in the iris. It greatly reduces the chance of a sudden blockage. Regular eye exams are also important. They allow your doctor to detect narrow angles before an emergency occurs. If you are in a higher risk group, routine screening can help catch problems early.
The outcome depends largely on how quickly treatment is received. When an acute attack is treated within the first few hours, many patients keep good vision. Delays in treatment can lead to significant and lasting vision loss. This is because high eye pressure damages the nerve fibers in the optic nerve. Some patients do have some reduced vision even after prompt treatment. This depends on how high the pressure rose and how long it stayed elevated. Recognizing the symptoms and seeking immediate care is very important.
Most patients report that laser iridotomy is not very painful. Before the procedure, your doctor will place numbing drops in your eye. These drops prevent you from feeling sharp pain. You may feel a mild pinching or tapping during the laser pulses. You will also see bright flashes of light. Some patients feel slight discomfort after the numbing drops wear off. This usually goes away within a few hours. Over-the-counter pain relievers can help manage any discomfort.
In most cases, yes. If one eye has had an acute attack, the other eye usually has a similar narrow shape. It is at high risk for having its own attack in the future. Your doctor will likely recommend a preventive laser iridotomy on the other eye. This is a widely accepted practice among eye care providers. It is considered an important step in preventing a second emergency. Your doctor will examine both eyes and discuss the recommendations with you.
The schedule for follow-up visits depends on your situation. In the weeks right after treatment, you may need to see your eye doctor every one to two weeks. They will monitor your eye pressure and check for complications. As your condition stabilizes, visits typically become less frequent. They may move to every few months. If you are using pressure-lowering eye drops, your doctor will want to see you regularly. They will make sure the medications are working well and check for side effects. Your care team will create a schedule that fits your needs and adjust it over time.