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Susvimo: A Refillable Eye Implant for Fewer Treatment Visits
How the Implant and Refill Process Work
Understanding the full treatment rhythm with Susvimo helps set realistic expectations. There are three stages: initial placement surgery, continuous delivery between visits, and periodic refill appointments that replace most of the routine injection schedule.
A Retina Specialist places the implant during a short outpatient procedure, typically performed with local numbing and sedation rather than general anesthesia. A small, precise opening is made in the wall of the eye, the implant is secured in position, and the conjunctiva and underlying tissue are closed carefully over it. This closure matters because a secure tissue covering over the implant is an important part of reducing the risk of infection later on.
Once the implant is in place and healing is complete, it works passively. Ranibizumab is released at a controlled rate into the eye throughout the day, without any action required on the patient's part. This continuous supply is what allows months to pass between treatment visits. Unlike an injection that peaks and then fades, the implant maintains a more consistent level of medicine. Most patients are not aware of the implant in day-to-day life once healed.
When the medicine supply runs low, the implant is refilled rather than removed or replaced. A Retina Specialist performs the refill in the office using a specialized needle that accesses the same implant, exchanging the remaining fluid for a fresh supply of ranibizumab. For wet AMD, this is scheduled approximately every 24 weeks, or about twice a year. The refill procedure involves numbing and is generally comparable in feel to an injection visit, but it happens far less frequently. Refill intervals for diabetic conditions may differ, so each patient's schedule is tailored to their diagnosis and how their eye responds.
Who Is a Good Candidate for Susvimo
Susvimo suits a specific group of patients, and the decision is genuinely personal. The right candidate has a combination of the right medical history, practical circumstances, and realistic expectations about both the benefits and the responsibilities involved.
The clearest candidate is someone whose wet AMD or diabetic eye disease is being controlled by anti-VEGF injections but who finds the frequency of those visits burdensome over time. Because the medicine inside the implant is the same class already working for that patient, the shift is about changing how the medicine is delivered, not finding something new. A proven response to at least two prior injections is the medical starting point for consideration.
Susvimo is not the right choice for everyone. Patients who are uncomfortable with eye surgery, or who prefer a lower-risk delivery method even at the cost of more frequent visits, may reasonably continue with injections. Those whose disease has not responded to anti-VEGF treatment are not candidates. Anyone who cannot reliably attend follow-up appointments or report changes promptly may also be safer with the standard approach, since the implant requires attentive monitoring that injections do not.
Real-life circumstances carry weight in this decision. Patients for whom travel, work schedules, or caregiving responsibilities make frequent clinic visits difficult may find the twice-a-year refill rhythm a meaningful improvement. On the other hand, the implant asks patients to notice and report changes quickly and to keep monitoring appointments consistently. Bringing an honest picture of your daily routine to the consultation helps your Retina Specialist give guidance that fits your actual life, not just the ideal scenario.
Risks, Complications, and What Results to Expect
Like any surgical device, Susvimo carries risks that go beyond what standard injections involve. Understanding those risks clearly, alongside the benefits, is what informed consent looks like for this treatment.
The most significant risk associated with Susvimo is endophthalmitis, a serious infection inside the eye. Clinical trial data showed a rate of endophthalmitis that was meaningfully higher with the implant than with monthly injections, and many of those infections followed a complication called conjunctival erosion, where the tissue covering the implant thins or pulls back. Both complications are uncommon, and careful surgical technique and prompt repair of any tissue changes help reduce them. Still, this risk is real and is higher than the risk from injections alone, which is why it sits at the center of the decision-making conversation.
Because Susvimo involves surgery, it carries risks that a simple injection does not. These can include bleeding inside the eye, fluid leakage, movement of the implant, development or worsening of a cataract (clouding of the natural lens), retinal detachment, and eye pain. Most are uncommon, and many can be managed when caught early. Your Retina Specialist will review the specific risks that apply to your eye health and history before any decision is made.
In the pivotal wet AMD trial, patients who received the implant refilled every 24 weeks maintained vision that was equivalent to patients receiving monthly ranibizumab injections. The implant did not produce better vision than intensive injections. Its advantage was achieving comparable vision outcomes with dramatically fewer treatment visits. For patients whose primary goal is to maintain current vision with less frequent care, this is the key finding. For patients hoping the implant will improve vision beyond what injections already provide, that expectation is not supported by the evidence.
Warning Signs That Require Prompt Attention
Knowing which symptoms to act on quickly is one of the most important parts of living with the Susvimo implant. Fast action is how a rare problem is kept from causing lasting damage.
Certain changes after implant surgery or a refill appointment should prompt same-day contact with your Retina Specialist, not a wait-and-see approach. Do not wait for a scheduled visit if you experience any of the following.
- Eye pain that is increasing or that returns after seeming to settle
- Growing redness, new discharge, or a visible bump or opening at the implant site
- Vision that is getting worse, or a new dark shadow or curtain across any part of your sight
- A sudden burst of new floaters or new flashing lights
These signs do not always mean something serious has occurred, but only a prompt exam can determine the cause. Because the implant carries a higher infection risk than standard injections, acting quickly on these symptoms is the single most protective thing a patient can do.
Some changes are not immediate emergencies but are still worth reporting before your next scheduled visit. A gradual increase in blurriness, new distortion where straight lines appear bent or wavy, a persistent scratchy sensation, or a visible change in the appearance of the tissue over the implant site are all worth calling about. Catching a disease flare or an early tissue problem while options are still straightforward is far easier than addressing it later. When in doubt about how urgent something is, call and describe it, and let the clinic decide how quickly you need to be seen.
Recovery After Implant Surgery
Recovering from Susvimo placement is similar in some ways to recovery from other minor eye surgery, though the tissue healing over the implant deserves particular attention during the early weeks.
After surgery, it is normal to notice some redness, mild soreness, a gritty or scratchy feeling, and a small red patch on the white of the eye that gradually fades. Vision may be blurry at first and then settle as the eye heals. Your Retina Specialist will prescribe eye drops and provide specific instructions about activities to avoid, typically including rubbing the eye, heavy lifting, and swimming for a period while the tissue over the implant heals. Following these instructions closely supports the healing that protects against later complications.
After full healing, the implant is designed to stay quietly in place for years. Because problems with the tissue covering the implant have been linked to more serious complications, catching and addressing any changes to that tissue early is an ongoing part of care. This means keeping monitoring appointments even when things are going well, and reporting any new redness, discomfort, or visible change at the implant site without delay. The implant is low-maintenance day to day, but steady follow-up is the trade-off for fewer treatment visits overall.
Frequently Asked Questions
These answers address common points of uncertainty that often come up after patients have read the basics about Susvimo.
No. Susvimo manages these conditions rather than curing them, just as ongoing injections do. The underlying disease remains present, which is why the implant is refilled on a regular schedule rather than removed once things improve. Stopping treatment entirely can allow the disease to become active again. Think of it as a lower-maintenance way to keep a chronic condition under control, not a one-time solution.
Susvimo was voluntarily recalled in late 2022 after testing identified that the seal on some implants did not hold up reliably to repeated refills. The manufacturer updated both the implant and the refill needle, confirmed through testing that the updated components met required performance standards, and the product was reintroduced in the United States in 2024. If you are considering Susvimo now, this history is worth discussing directly with your Retina Specialist, who can explain what changed and what the current device involves.
The refill-exchange visit uses numbing and a specialized needle to access the existing implant, swap out the remaining medicine, and introduce a fresh supply. Most patients describe the experience as broadly similar in comfort level to a standard injection visit. The important difference is frequency: for wet AMD, refills are scheduled approximately every six months rather than every one to two months. If you notice significant pain during or after a refill, that is not expected and warrants a same-day call.
Yes, removal is possible. It involves another surgical procedure with its own considerations and is not done lightly, but the option exists. In some complication scenarios, removal may be the appropriate step. Discussing this possibility before the initial implant surgery, including what the process looks like and what returning to injections would involve, is a reasonable and important part of the consultation. Going in with a clear picture of all available paths supports a truly informed decision.
Yes, if the other eye has its own condition requiring treatment. Each eye is managed separately based on its own status, and the implant in one eye has no effect on the other. It is common for patients to receive different treatments in each eye simultaneously, which is a normal part of individualized retinal care rather than a sign of a problem. Your Retina Specialist monitors both eyes at each visit and adjusts the plan for each one independently.
Clinical evidence does not support expecting better vision from the implant than from well-managed injection therapy. The trial results showed that the implant maintained vision at a level equivalent to monthly injections, which is a strong outcome, but not a superior one. If the goal is to preserve the vision gains already achieved through injections while reducing how often treatment is needed, that is precisely what Susvimo is designed to offer. Patients hoping for a vision improvement that injections could not produce should have a candid conversation with their Retina Specialist about realistic expectations.
Talk With Our Team About Your Options
At Atlantic Retina Center, our fellowship-trained Retina Specialists are exclusively focused on the retina, vitreous, and macula, bringing deep experience to every decision about long-term disease management across the Eastern Shore of Maryland and central and southern Delaware. If you are managing wet AMD or diabetic eye disease and wondering whether a different treatment approach might fit your life better, we welcome that conversation. Our team is here to help you weigh every option with the clarity and honesty you deserve.