Laser Iridotomy
What Is Laser Iridotomy?
Laser iridotomy is a targeted treatment for a specific type of glaucoma caused by a blocked drainage angle inside the eye. It addresses the root cause of the blockage by creating a new pathway for fluid to move freely, reducing the buildup of pressure that can damage the optic nerve and lead to vision loss.
Aqueous humor is the clear fluid that circulates inside your eye. In some people, the iris sits too close to the drainage angle and blocks that fluid from flowing out normally. The laser creates a small hole in the iris that acts as an alternate route, allowing the fluid to bypass the blockage and drain properly. This relieves pressure on the drainage angle and reduces the risk of an acute glaucoma attack.
Laser iridotomy is used to treat or prevent several related conditions involving narrow or closed drainage angles.
- Primary angle-closure suspect, which involves narrow angles without elevated eye pressure
- Acute angle-closure glaucoma, where pressure rises suddenly and requires urgent relief
- Chronic angle-closure glaucoma, where the drainage angle is progressively blocked over time
- Plateau iris syndrome, an anatomical condition that keeps the angle narrowed
- Secondary angle closure caused by inflammation or certain medications
Your eye doctor will determine which diagnosis applies to you based on a thorough evaluation before recommending this procedure.
Although laser iridotomy is considered safe for most people, there are situations where a different approach may be more appropriate. Your eye doctor will review your complete history and may suggest an alternative if any of the following apply.
- Advanced cataracts that are causing significant vision problems, where cataract surgery may address both the lens and the drainage angle at the same time
- Severe corneal clouding that prevents the laser from reaching the iris clearly
- Active eye infection or uncontrolled inflammation inside the eye
- Known allergies to the eye drops used during the procedure
Who Benefits From This Procedure?
Laser iridotomy is most valuable for people whose eye anatomy puts them at heightened risk for sudden or progressive pressure damage. Identifying and treating this risk early is one of the most effective ways to preserve long-term vision.
Some people are born with eyes that have less space between the iris and the drainage structures. This is called a narrow or occludable angle. On its own, a narrow angle may not cause symptoms, but it significantly increases the chance of a sudden pressure spike. Certain triggers, like dim lighting, strong medications, or emotional stress, can cause the pupil to widen and push the iris against the drainage angle entirely.
When the drainage angle closes completely, eye pressure can rise sharply within hours. This is called an acute angle-closure attack, and it is a medical emergency. Symptoms include severe eye pain, headache, nausea, and blurred or rainbow-tinted vision. Without prompt treatment, an acute attack can cause permanent vision loss. Laser iridotomy performed in advance prevents this emergency from occurring.
When laser iridotomy is performed before any acute episode, the treatment is straightforward and highly effective. Waiting until after an attack has occurred means that some damage to the drainage angle or optic nerve may have already happened. For patients identified as having narrow angles during a routine exam, early intervention offers the best chance of protecting their sight for years to come.
Preparing for Your Procedure
Preparing for laser iridotomy is simple and does not require the same level of preparation as surgery. Your care team will walk you through everything you need to know in advance so the appointment goes smoothly and safely.
Before scheduling the laser treatment, your eye doctor will perform a detailed evaluation that includes tonometry to measure eye pressure, gonioscopy to examine the drainage angle directly, and imaging of the optic nerve. These tests confirm that laser iridotomy is the right choice for your situation and establish a clear baseline to compare against after the procedure.
A few practical steps will help ensure your appointment goes as planned.
- Do not wear contact lenses on the day of the procedure
- Eat a light meal beforehand, since fasting is not required
- Bring a pair of sunglasses, as your eyes may be sensitive to light afterward
- Arrange for someone to drive you home, since your vision may be temporarily blurry
- Continue using your regular eye drops unless your eye doctor tells you otherwise
Let your eye doctor know about all medications you currently take, especially blood thinners, aspirin, or anti-inflammatory drugs, since these can affect how your eye responds during and after the procedure. It is equally important to mention any known allergies to eye drops or topical anesthetics. Sharing this information ahead of time allows the team to make any necessary adjustments to keep you safe and comfortable.
What Happens During the Procedure?
Laser iridotomy takes only a few minutes per eye and is performed in our office. Knowing what to expect at each stage helps reduce any anxiety you might have about the visit.
When you arrive, the team will apply anesthetic drops to numb the surface of your eye so you do not feel discomfort. You may also receive drops to constrict the pupil, which positions the iris to make the laser treatment more precise. A small, smooth contact lens will be gently placed on your eye to help steady your gaze and direct the laser accurately.
Your eye doctor will position the laser at the iris and create the small opening in a matter of seconds. You may notice brief flashes of bright light and possibly a mild sensation of pressure or a faint clicking sound, but the procedure is not painful. The entire treatment for one eye is usually complete within a few minutes, and both eyes can often be treated during the same visit or on separate occasions depending on your doctor's recommendation.
After the laser is applied, you will rest briefly in the office while the team monitors your eye pressure. This check is important because a temporary pressure rise can occur after the procedure in some patients. If your pressure increases beyond a safe level, your eye doctor will address it before you leave. You should not leave the office until your pressure has been confirmed stable.
Recovery and Aftercare
Most people return to their normal routines within a day or two after laser iridotomy. Following your aftercare instructions carefully supports healing and helps prevent complications.
Mild redness, light sensitivity, and slight blurring of vision are common in the hours following the procedure. These symptoms typically improve on their own within 24 to 48 hours. You will be given anti-inflammatory eye drops to use for a short period after the procedure to calm any irritation inside the eye.
Taking a few simple precautions at home will help your eyes heal comfortably.
- Use your prescribed anti-inflammatory drops exactly as directed
- Wear sunglasses outdoors to reduce light sensitivity
- Avoid rubbing your eyes
- Limit strenuous activity and heavy lifting for the first day or two
- Rest your eyes from screens for the remainder of the day of your procedure
Complications after laser iridotomy are uncommon, but you should call our office immediately if you experience sudden or worsening eye pain, a significant drop in vision, increasing redness, or any discharge from the eye. These signs may indicate a problem that needs prompt evaluation and should not be waited out at home.
Your eye doctor will schedule a follow-up visit within the first week after the procedure to confirm that the opening is clear, that eye pressure is within a normal range, and that your eye is healing as expected. Additional monitoring appointments will be scheduled over the following months, since ongoing evaluation of eye pressure and optic nerve health remains essential even after a successful procedure.
Risks and Side Effects
Laser iridotomy has a strong safety record, and serious complications are rare. Being informed about the possible risks helps you weigh the benefits of the procedure against the risks of leaving a narrow angle untreated.
The most frequently reported side effects are mild and short-lived. Temporary inflammation, light sensitivity, blurred vision, and a feeling of pressure in the eye can occur in the first day or two. These are normal responses to the laser and generally resolve on their own with the help of the prescribed anti-inflammatory drops.
A small number of patients may experience minor bleeding inside the eye at the treatment site, a temporary spike in eye pressure, or, very rarely, unintended effects on nearby eye structures. These situations are monitored closely during and after the procedure, and treatment is available if needed. The vast majority of patients have no significant complications.
A small percentage of patients notice a faint line of light, a ghost image, or increased glare after laser iridotomy, particularly in bright environments. This is caused by light passing through the new opening in the iris. For most patients, these disturbances fade over time or become less noticeable as the brain adjusts. In rare cases, they may persist, which is something to discuss openly with your eye doctor.
In some cases, the body's natural healing response can cause the laser-created opening to shrink or close over time. If this happens, the drainage angle may narrow again and a repeat laser iridotomy may be recommended. This is typically a straightforward procedure and does not indicate a treatment failure. Regular follow-up visits are the best way to catch this early before pressure becomes a concern.
Frequently Asked Questions
These answers address common questions patients have before and after laser iridotomy, with a focus on practical guidance and decision-making.
If both eyes have narrow angles, your eye doctor will typically recommend treating both, even if only one eye has shown symptoms or a pressure spike. Angle-closure risk is an anatomical issue, and the untreated eye carries the same vulnerability as the one already treated. The second eye can often be treated at the same visit or shortly after, depending on how the first eye responds.
This depends on your specific diagnosis. Laser iridotomy addresses angle closure by creating a new fluid pathway, but it does not treat open-angle glaucoma or lower pressure caused by other mechanisms. If you were already using drops for elevated eye pressure, your doctor will reassess your pressure readings at follow-up visits before making any changes to your medication plan. Never stop or reduce your drops without guidance from your eye doctor.
Going without treatment when narrow angles have been identified means you remain at risk for an acute angle-closure attack, which is a painful, vision-threatening emergency. Permanent vision loss can occur within hours if the attack is not reversed quickly. Because laser iridotomy is a low-risk, outpatient procedure, the benefit of prevention far outweighs the risks of the treatment in most cases where it has been recommended.
Yes, laser iridotomy can generally be performed on an eye with a cataract, provided the lens clouding is not so advanced that it blocks the laser from reaching the iris. In some situations, your eye doctor may recommend cataract surgery instead, since removing a thickened lens can itself open the drainage angle and address the underlying problem. Your doctor will help you understand which approach is better suited to your eye's anatomy and the severity of your cataract.
In most patients, the opening created during laser iridotomy remains open indefinitely and does not require any maintenance. A small number of patients may have the opening narrow or close due to the healing process, which would require a repeat treatment. This is why routine follow-up exams are important even after a successful procedure, since early detection of a closing opening allows for timely intervention.
Most major insurance plans and Medicare cover laser iridotomy when it is medically necessary, which includes cases of documented narrow angles, angle-closure glaucoma, or a history of an acute angle-closure attack. Your out-of-pocket costs will depend on your specific plan, deductible, and co-payment structure. Our team can help you navigate insurance questions before your appointment so there are no surprises.
Schedule Your Consultation at Rhode Island Eye Institute
If you have been told you have narrow angles or are at risk for angle-closure glaucoma, we encourage you to schedule a consultation with our team at Rhode Island Eye Institute. Our glaucoma specialist, Dr. Sarah Anis, trained at the Wilmer Eye Institute at Johns Hopkins and the New York Eye and Ear Infirmary and brings advanced expertise in laser and surgical glaucoma care to every patient she sees. We are proud to offer comprehensive glaucoma diagnostics and treatment in one trusted practice, with the goal of protecting your vision for the long term.