What Is Anti-VEGF Therapy
Anti-VEGF therapy is a type of treatment that helps protect and preserve your eyesight when certain retinal conditions threaten your vision. VEGF stands for vascular endothelial growth factor, which is a protein your body naturally produces. In healthy eyes, VEGF plays a helpful role in forming new blood vessels. However, in certain eye conditions, your body produces too much VEGF. This excess VEGF causes abnormal blood vessels to grow in the retina, which is the thin layer of tissue at the back of your eye that senses light and sends signals to your brain so you can see.
These abnormal blood vessels are fragile and tend to leak fluid or blood into the retina. When this happens, the retina swells and becomes damaged, leading to blurred or distorted vision. Anti-VEGF medications are injected directly into the eye to block the effects of excess VEGF. By doing so, these medications help reduce the growth of abnormal blood vessels, decrease leaking and swelling, and slow or stop further vision loss. In many cases, patients experience meaningful improvements in their vision after beginning treatment.
Anti-VEGF therapy is used to treat several retinal conditions that involve abnormal blood vessel growth or fluid leakage in the eye. One of the most common conditions treated is age-related macular degeneration, often called AMD. In the wet form of AMD, abnormal blood vessels grow beneath the macula, which is the central part of the retina responsible for sharp, detailed vision. Without treatment, wet AMD can cause rapid and significant vision loss.
Another condition commonly treated with anti-VEGF therapy is diabetic macular edema, also known as DME. This condition occurs when diabetes causes blood vessels in the retina to leak fluid into the macula, resulting in swelling and blurred central vision. Diabetic retinopathy affects 7.7 million Americans and is the leading cause of blindness among working-age adults (National Eye Institute, 2023). Anti-VEGF injections are also used to treat retinal vein occlusion, a condition in which a blood vessel in the retina becomes blocked, leading to fluid buildup and vision changes. Your care team at Washington Eye Institute will determine whether anti-VEGF therapy is the right approach for your specific condition.
Who Is a Good Candidate for Anti-VEGF Therapy
If you have been diagnosed with the wet form of age-related macular degeneration, you may be a strong candidate for anti-VEGF injections. Wet AMD typically affects older adults and can progress quickly without treatment. Your retina specialist will use imaging tests such as optical coherence tomography, commonly called OCT, and fluorescein angiography to look for signs of abnormal blood vessel growth and fluid leakage beneath the macula. If these signs are present, anti-VEGF therapy is often recommended as a primary treatment to help stabilize your vision and reduce further damage.
People living with diabetes who develop diabetic macular edema or proliferative diabetic retinopathy may benefit from anti-VEGF treatment. Diabetic macular edema occurs when damaged blood vessels leak fluid into the macula, causing it to swell. Proliferative diabetic retinopathy involves the growth of new, fragile blood vessels on the surface of the retina that can bleed and cause scarring. In both situations, anti-VEGF injections can help reduce swelling, slow abnormal blood vessel growth, and protect your remaining vision.
If you have diabetes, regular comprehensive eye exams are essential for catching these conditions early. The earlier treatment begins, the better the chances of preserving your eyesight. Your care team will work closely with you to monitor your retinal health and recommend treatment when it is needed.
Retinal vein occlusion occurs when one of the veins that carries blood away from the retina becomes blocked, usually by a blood clot. This blockage causes blood and fluid to back up into the retina, leading to swelling and vision loss. Anti-VEGF therapy can help reduce the fluid buildup that results from a retinal vein occlusion and may improve your vision over time. Your retina specialist will evaluate the extent of the blockage and the amount of swelling to determine whether anti-VEGF treatment is appropriate for you.
Before recommending anti-VEGF therapy, your care team will consider several factors. These include the specific condition affecting your retina, how much vision you have lost, the amount of fluid or blood present in the retina, and your overall eye health. Your general health history is also important, as your care team will want to know about any other medical conditions you have and any medications you take.
In most cases, anti-VEGF therapy is well tolerated by a wide range of patients. However, certain eye conditions or health factors may require your care team to consider alternative treatments or take additional precautions. Your care team at Washington Eye Institute will have an open conversation with you about your options so you can make an informed decision together.
How Anti-VEGF Therapy Works
Anti-VEGF medications work by targeting and blocking vascular endothelial growth factor, the protein responsible for triggering abnormal blood vessel growth in the retina. When too much VEGF is present, it signals the body to create new blood vessels in areas where they are not needed. These new vessels are poorly formed, fragile, and prone to leaking. Anti-VEGF drugs bind to the VEGF molecules and prevent them from attaching to receptors on blood vessel cells. This stops the chain reaction that leads to new vessel growth and leakage.
By blocking VEGF, these medications accomplish several important goals. They slow or stop the formation of new abnormal blood vessels. They reduce the permeability of existing blood vessels, meaning less fluid leaks into the surrounding retinal tissue. They also help decrease the swelling in the macula that causes blurred and distorted vision. Over time, this can lead to drier, healthier retinal tissue and clearer vision.
Anti-VEGF medication is delivered through an intravitreal injection, which means the medicine is injected directly into the vitreous cavity of the eye. The vitreous is the clear, gel-like substance that fills the middle of the eye. By placing the medication inside the eye, it can reach the retina directly and begin working right away. This targeted delivery method allows the medication to be highly effective at the site where it is needed most.
The injection uses a very fine needle, and the procedure itself takes only a few seconds. While the idea of an injection into the eye may sound concerning, most patients report that the discomfort is minimal and brief. Your care team takes several steps to make the experience as comfortable as possible, which will be explained in more detail in later sections of this page.
Anti-VEGF medications are effective at controlling the conditions they treat, but the body continues to produce VEGF over time. This means that a single injection is generally not enough to manage most retinal conditions. Instead, patients typically need a series of injections to maintain the benefits of treatment. In the beginning, injections are often given on a monthly basis to build up the effects of the medication and gain control over the condition.
As your condition stabilizes, your retina specialist may be able to extend the time between injections. This approach is often called a treat-and-extend protocol. Your care team will monitor your retina closely with regular imaging and eye exams to determine the right schedule for you. The goal is to find the longest interval between injections that still keeps your retina stable and your vision protected. Every patient responds a little differently, so your treatment plan will be personalized to your needs.
Types of Anti-VEGF Medications Available
Several anti-VEGF medications have received approval from the U.S. Food and Drug Administration for treating retinal conditions. Each of these medications works by blocking VEGF, but they differ in their molecular structure, how long they remain active in the eye, and the specific conditions for which they have been approved. Your retina specialist at Washington Eye Institute is experienced with all available anti-VEGF medications and will recommend the one that is most appropriate for your particular condition and circumstances.
The development of anti-VEGF therapies has been one of the most significant advances in retinal care in recent decades. Before these medications became available, many patients with wet AMD, diabetic macular edema, and retinal vein occlusion had limited treatment options and faced a high likelihood of significant vision loss. Today, anti-VEGF therapy gives patients a meaningful chance to preserve and sometimes improve their vision.
Your retina specialist considers several factors when selecting an anti-VEGF medication for your treatment. The specific condition being treated plays a major role, as some medications may be better suited for certain diagnoses. Your care team will also consider how your eye has responded to any previous treatments, the severity of your condition, and the amount of fluid or abnormal blood vessel activity present in your retina.
The duration of action of each medication is another important consideration. Some anti-VEGF drugs remain active in the eye for a longer period, which may allow for longer intervals between injections. This can be an important factor for patients who find frequent office visits challenging. Your care team will discuss the available options with you and explain the reasoning behind their recommendation so you feel confident in your treatment plan.
Research in the field of anti-VEGF therapy continues to advance. Scientists and clinicians are working on newer formulations that may last longer in the eye, reducing the number of injections patients need over time. Some newer medications target multiple pathways involved in abnormal blood vessel growth, not just VEGF alone. These developments offer hope for even more effective treatments in the future.
Your care team at Washington Eye Institute stays informed about the latest developments in retinal care. If newer treatment options become available that may benefit you, your care team will discuss them with you. The goal is to provide you with the most effective and convenient treatment plan possible based on the current evidence and your individual needs.
In some cases, your retina specialist may recommend combining anti-VEGF therapy with other treatments. For example, laser therapy may be used alongside anti-VEGF injections for certain types of diabetic retinopathy. In other situations, steroid injections or steroid implants may be considered if anti-VEGF therapy alone does not fully control the swelling in your retina. These decisions are highly individualized and depend on how your eye responds to initial treatment.
If your condition does not respond well to one anti-VEGF medication, your care team may suggest switching to a different one. It is not uncommon for patients to respond better to one medication than another, even though they work through similar mechanisms. Your care team will monitor your progress carefully and adjust your treatment plan as needed to achieve the best possible outcome for your vision.
What to Expect During and After Treatment
When you arrive at Washington Eye Institute for your anti-VEGF injection, your care team will guide you through each step of the process. The appointment typically takes less than an hour, though the injection itself lasts only a few seconds. You do not need to fast before the procedure, and you can take your regular medications as usual unless your care team advises otherwise. It is a good idea to arrange for someone to drive you home after the appointment, as your vision may be slightly blurry for a short time afterward.
Before the injection, your care team will check your vision and may perform imaging tests such as OCT to monitor the condition of your retina. Your eye will then be numbed using anesthetic drops so that you do not feel pain during the injection. An antiseptic solution will be applied to clean the surface of your eye and reduce the risk of infection. Your comfort and safety are the top priorities throughout the entire process.
Once your eye is fully numbed, your care team will use a very thin needle to inject the anti-VEGF medication into the vitreous cavity of your eye. You may feel a slight pressure sensation, but most patients report that the injection is much less uncomfortable than they expected. The injection itself is over in just a few seconds. After the medication is delivered, your care team may briefly check your eye to make sure everything looks normal.
Many patients who were initially anxious about the procedure find that their concern decreases significantly after their first injection. Knowing what to expect and trusting your care team can help ease any nervousness. Your care team at Washington Eye Institute performs these injections routinely and is skilled at making the experience as smooth and comfortable as possible.
After the injection, you may notice some mild symptoms that are normal and expected. These can include a gritty or scratchy feeling in the eye, mild redness at the injection site, slight blurriness, and small floaters or spots in your vision. These symptoms typically resolve on their own within a day or two. Your care team will give you specific instructions about caring for your eye after the procedure, including when to use any prescribed eye drops.
Most patients are able to return to their normal daily activities the same day or the day after their injection. You should avoid rubbing your eye and try to keep water and soap away from your eye for a short period after the procedure. If you experience significant pain, a sudden increase in floaters, flashing lights, or a noticeable decrease in vision after your injection, contact Washington Eye Institute right away, as these could be signs of a rare but serious complication that requires prompt attention.
Anti-VEGF injections are considered a safe and well-established treatment, but like any medical procedure, they carry some risks. The most common side effects are mild and temporary, such as eye redness, irritation, and watery eyes. More serious complications are uncommon but can include infection inside the eye, called endophthalmitis, bleeding in the eye, retinal detachment, or increased eye pressure. Your care team takes careful precautions to minimize these risks, including using sterile techniques and monitoring your eye health at each visit.
It is important to attend all of your scheduled follow-up appointments so your care team can monitor your eye for any signs of complications and assess how well the treatment is working. If you have any questions or concerns between appointments, do not hesitate to contact your care team. They are available to help you and want to make sure you feel supported throughout your treatment journey.
Your Treatment Journey at Washington Eye Institute
Your treatment journey begins with a comprehensive eye examination at one of our locations in Greenbelt, Rockville, or Cumberland. During this visit, your retina specialist will perform a thorough evaluation of your eyes, including dilating your pupils to get a clear view of your retina. Advanced imaging tests such as optical coherence tomography and fluorescein angiography may be used to create detailed pictures of your retina and identify any areas of abnormal blood vessel growth, fluid leakage, or swelling.
Based on the results of your examination, your care team will explain your diagnosis in clear, easy-to-understand terms. If anti-VEGF therapy is recommended, your care team will walk you through the treatment plan, including how often you will need injections, what to expect at each visit, and the goals of treatment. You will have the opportunity to ask questions and share any concerns before beginning therapy.
Most anti-VEGF treatment plans begin with a loading phase, which involves a series of injections given at regular intervals, often monthly, over the first few months. The purpose of the loading phase is to build up the concentration of the medication in your eye and gain control over the abnormal blood vessel activity or fluid leakage. During this phase, your care team will monitor your retina closely to see how your eye is responding to treatment.
It is important to attend every appointment during the loading phase, even if your vision seems stable or improved. Skipping or delaying injections during this critical period can allow the condition to worsen and may make it harder to regain lost vision. Your care team understands that frequent appointments can be inconvenient, and they will work with you to schedule visits at times that fit your life as much as possible.
After the loading phase, your retina specialist will transition you to a maintenance phase. During this phase, the interval between injections may be gradually extended based on how well your retina is responding. At each visit, your care team will check your vision, examine your retina, and review imaging results to determine whether it is safe to extend the time until your next injection or whether a shorter interval is needed.
This ongoing monitoring is a key part of successful anti-VEGF therapy. Retinal conditions like wet AMD and diabetic macular edema are chronic, meaning they require long-term management. While this can feel like a significant commitment, many patients find that the benefits of preserving their vision make the effort worthwhile. Your care team at Washington Eye Institute will be with you every step of the way, providing consistent, personalized care throughout your treatment.
The primary goal of anti-VEGF therapy is to protect your vision and prevent further loss. Many patients experience stabilization of their vision, meaning their eyesight stops getting worse. A significant number of patients also experience measurable improvements in their vision, particularly if treatment is started early in the course of the disease. Success may also be measured by reductions in retinal swelling and fluid, which your care team can see on imaging tests even before you notice changes in your vision.
It is important to have realistic expectations about treatment outcomes. While anti-VEGF therapy is highly effective, the results can vary from person to person depending on factors such as the type and severity of the condition, how long the condition has been present before treatment began, and how consistently the treatment schedule is followed. Your care team will help you understand what outcomes are realistic for your situation and will celebrate your progress with you along the way.
Frequently Asked Questions About Anti-VEGF Therapy
Most patients are pleasantly surprised by how little discomfort they experience during an anti-VEGF injection. Before the procedure, your eye is numbed with anesthetic drops, which means you should not feel sharp pain during the injection. You may feel a brief sensation of pressure when the medication is being delivered. Some patients describe a mild sting or a feeling of fullness in the eye that lasts only a moment. After the numbing drops wear off, you may notice some mild irritation or scratchiness, similar to the feeling of having an eyelash in your eye, but this typically goes away within a day.
If you are feeling anxious about the procedure, let your care team know. They are experienced in helping patients feel at ease and can take extra steps to ensure your comfort. Many patients who were nervous before their first injection report that the anticipation was far worse than the actual experience.
The number of injections you will need depends on your specific condition and how your eye responds to treatment. Most patients begin with a series of monthly injections during the loading phase, which typically lasts three to four months. After that, your care team will assess your response and may extend the intervals between injections. Some patients are able to go several months between treatments, while others may need more frequent injections to maintain stable vision.
For many retinal conditions treated with anti-VEGF therapy, treatment is ongoing and may continue for years. This is because these conditions are chronic and the underlying disease process can become active again if treatment is stopped. Your retina specialist will work with you to find the most effective and manageable treatment schedule. Regular communication with your care team about how you are feeling and any changes in your vision helps them make the best decisions about your care.
It is generally recommended that you arrange for someone else to drive you home after your anti-VEGF injection appointment. Your pupils may be dilated during the visit, which can make your vision blurry and your eyes sensitive to light for several hours. Additionally, some patients experience temporary blurriness from the injection itself or from the lubricating gel used during the procedure. For your safety and comfort, having a driver is the best plan.
If arranging transportation is a challenge, talk to your care team at Washington Eye Institute. They may be able to suggest resources or adjust the timing of your appointment to make transportation easier for you.
Staying on schedule with your anti-VEGF injections is important for maintaining the best possible vision outcomes. If you miss or significantly delay an injection, the medication from your previous treatment may wear off, allowing the underlying condition to become more active again. This can lead to a return of fluid leakage, swelling, or abnormal blood vessel growth, which may cause your vision to decline.
If you do miss an appointment, contact Washington Eye Institute as soon as possible to reschedule. In many cases, a brief delay can be managed without significant consequences, but longer gaps in treatment can be more difficult to recover from. Your care team understands that life can sometimes get in the way of medical appointments, and they will work with you to get your treatment back on track as quickly as possible.
Common side effects after an anti-VEGF injection include mild eye redness, a gritty or scratchy feeling, watery eyes, and temporary blurriness. These symptoms are expected and usually resolve within a day or two. You may also notice small floaters in your vision, which are often tiny air bubbles from the injection that will disappear on their own.
While serious side effects are uncommon, it is important to know the warning signs that require immediate attention. Contact Washington Eye Institute or seek emergency care if you experience severe eye pain, a sudden decrease in vision, a significant increase in floaters or flashing lights, or increasing redness and swelling that does not improve. These could be signs of a rare complication such as an infection or retinal detachment, and prompt treatment is essential. Your care team will provide you with detailed instructions and emergency contact information at each visit so you know exactly what to do if any concerns arise.
The results of anti-VEGF therapy vary depending on several factors, including the type and severity of your retinal condition, how long the condition has been present before treatment started, and how consistently you follow your treatment schedule. Many patients experience stabilization of their vision, meaning the condition stops progressing and further vision loss is prevented. A good number of patients also see measurable improvements in their visual acuity, especially when treatment begins early.
However, it is important to understand that anti-VEGF therapy may not fully restore vision that has been lost due to long-standing retinal damage. The treatment is most effective at preventing further decline and may recover some of the vision loss caused by recent fluid buildup or swelling. Your retina specialist at Washington Eye Institute will give you an honest assessment of what you can expect based on your individual situation. Together, you and your care team will set realistic goals and work toward the best possible outcome for your eyesight.