iStent for Glaucoma Treatment
What is iStent?
iStent is a microscopic titanium device that creates a new pathway for fluid to drain from your eye. By restoring more normal fluid flow, it helps lower the pressure that can damage your optic nerve and lead to vision loss. This treatment is an example of what we call minimally invasive glaucoma surgery, or MIGS, which offers effective pressure control with less risk and faster recovery than traditional glaucoma procedures.
The iStent was created to provide a safer, less invasive alternative to conventional glaucoma surgeries. First approved by the FDA in 2012, it has since been successfully implanted in tens of thousands of patients around the world. Clinical studies show that iStent can lower eye pressure by an average of 15 to 30 percent, helping patients maintain healthier vision over time.
There are several models of iStent available, including the original iStent, the iStent inject, and the newer iStent inject W. Some versions use a single stent, while others like the iStent inject W place two tiny stents to enhance drainage even further. During your evaluation, we will recommend the version that best fits your specific type and stage of glaucoma.
Each iStent is made from medical-grade titanium, a material widely used in implants because it is safe, durable, and well tolerated by the body. The device is so small that it can be inserted through a self-sealing micro-incision, which means less trauma to your eye and a gentler recovery.
iStent is manufactured by Glaukos Corporation, a leader in minimally invasive glaucoma surgery technology. The company has built a strong reputation for innovation and quality, and their devices are trusted by ophthalmologists worldwide for their proven safety and long-term effectiveness.
How Does iStent Work?
iStent works by bypassing the blocked or damaged areas of your eye's natural drainage system. This allows fluid to flow out more easily, which lowers the pressure inside your eye. Reducing that pressure is the key to protecting your optic nerve from further glaucoma damage.
In a healthy eye, fluid continuously drains through a spongy tissue called the trabecular meshwork. When you have glaucoma, this drainage pathway often becomes clogged, causing pressure to build up. The iStent creates a small, permanent opening in the meshwork that restores your eye's natural outflow, helping fluid drain the way it should.
Most patients receive their iStent during cataract surgery. This combination approach is highly convenient because it allows us to treat both conditions at once, reducing your overall healing time and the number of procedures you need. If you have both cataracts and glaucoma, this dual treatment can be an excellent way to address both issues in a single visit.
Once in place, the iStent is permanent and requires no maintenance. Many patients enjoy stable eye pressure and reduced dependence on glaucoma medications for years after implantation. Regular follow-up appointments remain important so we can monitor your eye health and make adjustments to your treatment plan if needed.
Benefits of iStent
iStent offers multiple advantages for people living with glaucoma. It provides effective pressure control through a quick, minimally invasive procedure, and it often reduces the need for daily eye drops. For many patients, this translates into a simpler routine and a better quality of life.
By improving fluid drainage, iStent effectively lowers intraocular pressure, which is the primary goal of all glaucoma treatment. Lower pressure helps slow the progression of the disease and protects your vision from further damage caused by optic nerve deterioration.
After iStent placement, many patients can reduce or even eliminate their daily glaucoma eye drops. This not only simplifies your routine but also reduces the side effects, costs, and inconvenience that can come with long-term medication use.
Unlike traditional glaucoma surgeries, inserting an iStent requires only a very small incision and adds just a few minutes to your cataract procedure. Recovery is typically faster, and the risk of complications is lower compared to more invasive options like trabeculectomy or tube shunts.
With better pressure control and fewer medications to manage, you can focus more on the activities you enjoy rather than worrying about your glaucoma. Many patients report feeling more confident and less burdened by their eye care routine after receiving an iStent.
Because iStent is a tissue-sparing procedure, it does not limit your options if you need additional glaucoma treatment down the road. You can still undergo laser procedures like Selective Laser Trabeculoplasty, receive newer therapies such as Durysta or iDose, or have more advanced surgeries if necessary. This stepwise approach gives you and your eye doctor flexibility as your needs change over time.
The iStent Procedure
Placing an iStent is a quick outpatient procedure most often performed at the same time as cataract surgery. It is done using numbing eye drops for comfort, and most patients experience very little discomfort during or after the treatment.
Before your surgery, we will perform a thorough eye exam, including Optical Coherence Tomography and Visual Field Testing, to confirm that iStent is right for you. You may be asked to adjust your glaucoma medications in the days leading up to the procedure. You will also need to arrange for someone to drive you home afterward, as your vision may be temporarily blurry.
Your eye will be numbed with anesthetic drops, so you should not feel pain. Using a specialized microscope and applicator, your surgeon will make a tiny incision and carefully insert the iStent into the drainage channel inside your eye. The entire process takes just a few minutes, and most patients report feeling only mild pressure or no sensation at all.
It is normal to experience some mild redness, irritation, or light sensitivity for the first few days. We will prescribe anti-inflammatory and antibiotic eye drops to help your eye heal and prevent infection. Most patients go home the same day and can resume light activities within a day or two.
Recovery and Aftercare
Recovery from iStent placement is usually smooth and straightforward. Following your post-operative instructions carefully will help ensure the best possible outcome and long-term success of your treatment.
Initial healing typically takes about one week, during which your vision will gradually clear. You may notice some mild discomfort or blurriness at first, but this should improve steadily. The full benefit of the iStent on your eye pressure is often seen within one to three months as your eye stabilizes and adjusts to the improved drainage.
To protect your eye and promote healing, please follow these important guidelines.
- Use all prescribed eye drops exactly as directed.
- Avoid rubbing or pressing on your eye.
- Wear sunglasses outdoors to protect against bright light and debris.
- Avoid heavy lifting, strenuous exercise, and swimming for at least two weeks.
- Attend all scheduled follow-up appointments so we can monitor your progress.
Call our office right away if you experience severe or worsening pain, a sudden change in vision, increasing redness, or any discharge from your eye. These symptoms could indicate a complication that needs prompt attention. We are here to support you throughout your recovery.
Potential Risks and Side Effects
iStent has an excellent safety profile, but like any medical procedure, it does carry some risk. Most side effects are mild and temporary, resolving on their own as your eye heals.
The most common side effects include temporary blurred vision, mild redness, light sensitivity, or a small amount of internal bleeding that clears on its own. These issues typically resolve within a few days to a couple of weeks after the procedure and are usually not cause for concern.
Serious complications are uncommon but can include the stent shifting out of position, blockage of the stent, or inflammation inside the eye. Infection is very rare but requires immediate treatment if it occurs. Choosing an experienced glaucoma surgeon significantly reduces these risks.
The best way to reduce your risk is to choose a fellowship-trained ophthalmologist with extensive experience in MIGS procedures. Following all pre-operative and post-operative instructions carefully is equally important. Be sure to provide us with your complete medical history so we can tailor your care plan for the safest and most effective results.
Is iStent Right for You?
Determining whether iStent is a good fit depends on the type and severity of your glaucoma, your overall eye health, and your treatment goals. We will carefully evaluate your condition and discuss all your options to help you make an informed decision.
The best candidates for iStent are typically adults with mild to moderate open-angle glaucoma who are also undergoing cataract surgery. It is also a good option for patients who have difficulty using eye drops consistently or who experience bothersome side effects from their glaucoma medications. The procedure is FDA approved for adults 18 years and older.
iStent may not be suitable if you have certain types of glaucoma, such as angle-closure glaucoma, or if you have significant scarring or damage to the drainage angle from previous surgery or injury. A thorough examination with technologies like Optical Coherence Tomography will help us determine if your anatomy is right for this device.
If iStent is not the right fit for you, we offer a full range of alternatives. These include other MIGS devices like Hydrus Microstent or Kahook Dual Blade, laser treatments such as Selective Laser Trabeculoplasty or Laser Peripheral Iridotomy, sustained-release therapies like Durysta or iDose, and traditional surgeries like trabeculectomy or tube shunts for more advanced or medication-refractory glaucoma.
We encourage you to ask questions so you feel confident in your treatment plan. Consider asking about the expected success rate for your specific condition, what your recovery will look like, how the costs and insurance coverage work, and how iStent compares to other options available to you. Our team is here to provide clear, honest answers.
Frequently Asked Questions
Here are answers to some of the most common questions we hear from patients considering iStent.
The iStent is a permanent implant and is designed to last for the rest of your life. It does not wear out, degrade, or require replacement. However, you will still need regular monitoring to ensure your glaucoma remains well controlled over time.
Most insurance plans, including Medicare, cover iStent when it is placed during cataract surgery, since both procedures are considered medically necessary. If you are considering a standalone iStent procedure without cataract surgery, coverage may vary. We recommend checking with your insurance provider, and our team is happy to help verify your benefits.
Many patients are able to significantly reduce or completely stop using glaucoma eye drops after receiving an iStent. However, some people may still need one or more medications depending on their target eye pressure and the severity of their disease. Your doctor will work with you to find the right balance.
If your eye pressure is not adequately controlled with iStent alone, we have many additional treatment options available. These may include resuming or adjusting your eye drops, performing a laser procedure, adding a sustained-release implant, or considering a more traditional glaucoma surgery. The beauty of MIGS is that it preserves these future options.
Yes, this is actually the most common way iStent is used. Combining cataract removal with iStent placement allows us to treat both conditions in a single procedure, saving you time and reducing your overall recovery period. This approach is especially beneficial for patients who have both cataracts and glaucoma that needs better control.
Expert Glaucoma Care When You Need It
If you are living with glaucoma, exploring advanced treatment options like iStent is an important step toward preserving your vision for the long term. At Dulles Eye Associates, our fellowship-trained glaucoma specialists, including those with expertise in laser and minimally invasive glaucoma surgery, are here to provide compassionate, comprehensive care using the latest technology. We invite you to schedule a consultation at one of our convenient Northern Virginia locations to learn more about whether iStent or another treatment option is right for you.
Dr. Nasrullah is a fantastic LASIK surgeon who truly cares. He explained everything, answered all questions, and ensured my prescription was correct. Perfect vision and very happy!
John Marchessault
I've experienced only the best care from Doctors Nasrullah, Dar and Kang. They explain and answer questions with patience and understanding. Everyone is pleasant and efficient.
Paulette Taylor
Dulles Eye Center has been great. Dr. Nasrullah performed cataract surgery for my family member and did excellent work. Kim Vu was kind and helpful with recovery instructions. Wonderful care!
Christopher Guy
I have visited this practice several times, specifically seeing Dr. Dar. You never feel rushed, and they make you feel important as a patient. I highly recommend them.
Michelle Garrison
Dr. Nasrullah at Dulles Eye Associates impressed me with his thoroughness, knowledge, and individualized Lasik plan. Surgery went smoothly—highly recommend!
Rajesh Subedi