Combination Therapy with Anti-VEGF and PDT
What Is Combination Therapy with Anti-VEGF and PDT?
Anti-VEGF medications block a protein called vascular endothelial growth factor, which causes abnormal blood vessels to grow and leak in your retina. By stopping this protein, the injections help reduce swelling, dry up fluid, and prevent further vision loss.
Our eye doctor injects these medications directly into your eye during a quick in-office procedure. The injection targets the root cause of many retinal diseases and has become the foundation of modern retinal care.
Photodynamic therapy uses a light-sensitive medication called verteporfin that we inject into your arm. The medication travels through your bloodstream and collects in abnormal blood vessels in your eye.
We then shine a special low-power laser at the affected area of your retina. The laser activates the medication, aiming to selectively close abnormal vessels while minimizing impact on surrounding tissue. However, some effects on nearby retinal structures can occur, and changes in vision are possible.
In select cases, using both therapies together may provide benefits that one treatment alone cannot achieve. Combination therapy may be considered when anti-VEGF injections have not fully stopped leakage or when certain types of abnormal vessels need additional treatment.
- PDT can help close off polypoidal lesions and reduce leakage in specific neovascular patterns
- Anti-VEGF injections can reduce new vessel growth and inflammation
- The two treatments work through different mechanisms and may complement each other
- Some research suggests combination therapy may reduce the total number of injections needed over time in certain patients with specific disease subtypes
We may consider combination therapy for a limited set of neovascular conditions affecting the macula. The most common scenarios include:
- Polypoidal choroidal vasculopathy, characterized by aneurysmal polypoidal lesions with a branching vascular network often confirmed on indocyanine green angiography
- Select neovascular age-related macular degeneration subtypes that have not responded adequately to anti-VEGF alone, evaluated case by case
- Pachychoroid neovasculopathy and other choroidal neovascularization patterns determined by your retina specialist
- Many other common retinal vascular diseases, such as diabetic retinopathy and retinal vein occlusions, are usually managed successfully without PDT
Currently, most retinal conditions are managed successfully with anti-VEGF injections as the primary treatment.
Signs You May Need This Treatment
Many patients first notice distortion in their central vision, where straight lines appear wavy or bent. You might also experience a dark or blank spot in the center of your vision, making it hard to read, recognize faces, or see fine details.
- Sudden blurring in one or both eyes
- Colors appearing less vivid or washed out
- Difficulty adjusting from bright to dim lighting
- Objects appearing smaller or larger than they should
When we examine your retina through dilated pupils, we look for signs of fluid buildup, bleeding, or abnormal blood vessel growth. We may see areas of swelling in your macula, the central part of your retina responsible for sharp vision.
Special tests and imaging help us identify the specific pattern and location of these abnormal vessels. Your exam findings guide whether we recommend single therapy or a combination approach.
Certain factors increase the likelihood that you may need more intensive treatment beyond standard anti-VEGF injections. Age over 50, smoking history, and family history of macular degeneration elevate your risk for developing complex retinal disease.
If you have already received multiple anti-VEGF injections with incomplete response, we may evaluate whether combination therapy is appropriate. Asian ancestry can also increase the risk of polypoidal choroidal vasculopathy, a condition where combination therapy may be beneficial.
How We Diagnose and Plan Your Treatment
Advanced imaging technology lets us see detailed cross-sections and blood flow patterns in your retina. These tests are painless and provide crucial information about the type and extent of abnormal vessel growth.
- Optical coherence tomography (OCT) creates high-resolution images of retinal layers
- Fluorescein angiography maps blood flow and leakage patterns
- Indocyanine green angiography can reveal deeper vessel abnormalities
- OCT angiography shows blood vessel details without injecting dye
Before any dye-based imaging test, we review your allergy history and prior reactions to contrast materials or iodine-containing substances. Serious reactions to these dyes are rare.
During fluorescein angiography, we inject a yellow-orange dye into a vein in your arm. As the dye circulates through the blood vessels in your retina, we take a series of photographs that show where and how quickly the dye appears.
Areas of leakage or abnormal vessel growth light up differently than healthy tissue. The test takes about 10 to 15 minutes, and you may notice your skin has a slight yellow tint and your urine appears bright yellow or orange for up to 24 hours afterward.
Some patients experience mild nausea during or after the injection, and allergic reactions such as hives or itching can occur, though serious reactions are rare. Let us know if you have a history of dye allergies, asthma, or prior reactions to contrast materials.
Optical coherence tomography uses light waves to capture detailed images of your retina layer by layer, similar to how an MRI works. We can measure the exact thickness of your retina and identify pockets of fluid that indicate active leakage.
OCT scans are quick, non-invasive, and repeatable, making them ideal for monitoring your response to treatment over time. We compare your scans at each visit to see whether fluid is decreasing and your retinal structure is improving.
Our decision depends on the specific pattern of blood vessel growth, the location and extent of leakage, and how your condition has responded to any previous treatments. If imaging reveals polypoidal lesions or other specific vessel patterns, we may discuss combination therapy.
We also consider your overall health, treatment history, and individual goals. Currently, we start most patients on anti-VEGF injections alone and reserve combination therapy for those who need additional intervention.
What to Expect During Combination Treatment
When we plan combination therapy, the sequencing of PDT and anti-VEGF injection is individualized based on your imaging findings, the presence of hemorrhage, and the treatment protocol best suited to your condition. Some patients receive both treatments on the same day, while others have the procedures staged a few days apart.
PDT may be performed before or after the anti-VEGF injection depending on your specific clinical scenario. We will explain the exact timing and schedule during your treatment planning visit.
Before your PDT session, we will give you detailed instructions on what to expect and how to prepare. You should arrange for someone to drive you home, as your vision may be blurry for several hours after the procedure.
We will review your medical history to ensure PDT is safe for you. Be sure to inform us of:
- Any history of porphyria or severe photosensitivity disorders
- Pregnancy, breastfeeding, or plans to become pregnant
- Liver disease or impaired liver function
- Medications or supplements that increase sun sensitivity, such as certain antibiotics, diuretics, or herbal products
- Prior allergic reactions to verteporfin or problems with intravenous infusions
On the day of treatment, wear protective clothing that covers your arms and legs, and bring sunglasses and a wide-brimmed hat for after the procedure. Avoid scheduling outdoor activities for 48 hours after treatment.
We start by injecting verteporfin into a vein in your arm over about 10 minutes. You then wait for a short period while the medication circulates and accumulates in the abnormal blood vessels of your retina.
Next, we use numbing drops to make your eye comfortable and place a special contact lens on your eye to focus the laser. The laser treatment itself lasts about 90 seconds, during which you will see a bright light but should not feel pain. Afterward, we remove the contact lens and check your eye.
The anti-VEGF injection procedure takes just a few minutes and is performed in our office. We clean the surface of your eye with an antiseptic solution and use numbing drops to ensure you feel minimal discomfort.
Our eye doctor injects the medication through the white part of your eye using a very thin needle. You may feel slight pressure or a brief sensation, but most patients tolerate the injection well. We monitor you briefly before you go home.
Normal temporary effects after your injection may include:
- Mild scratchiness or gritty feeling
- Tearing or watery eye
- A small red spot on the white of your eye (subconjunctival hemorrhage)
- Seeing floaters or the medication bubble for a few hours
Call our office urgently if you develop worsening pain, worsening redness, decreasing vision, increasing floaters, or flashes of light.
The verteporfin medication makes your skin and eyes sensitive to light for 48 hours after your PDT treatment. You must protect yourself from direct sunlight and very bright indoor light during this period, as exposure can cause skin reactions similar to severe sunburn.
- Avoid direct sunlight for two full days, including sunlight coming through car windows and home windows
- Wear long sleeves, pants, gloves, and a wide-brimmed hat if you must go outside briefly
- Use sunglasses when outdoors and during car rides
- Normal indoor ambient lighting is generally acceptable; you do not need to stay in darkness
- Avoid spotlights, halogen work lights, and prolonged time near very bright windows
- Avoid tanning beds and do not use sunlamps
- After 48 hours, gradually test your sensitivity in small amounts of sunlight before resuming normal outdoor activities
Recovery, Follow-Up, and Managing Side Effects
Right after your combination treatment, your vision may be blurry and you may see spots or floaters. These effects are normal and usually improve within a few hours to a day. If we prescribe eye drops for comfort or to reduce inflammation, use them exactly as directed.
Infection prevention relies primarily on the antiseptic preparation and sterile technique used during your injection. Watch closely for warning signs and contact us urgently if you notice worsening pain, redness, or vision changes. Rest your eyes for the remainder of the day and avoid strenuous activities, heavy lifting, or bending over for at least 24 hours.
During the first 48 hours after PDT, protection from direct sunlight and very bright indoor light is your most important responsibility. Normal indoor lighting from standard lamps and overhead fixtures is generally safe for routine activities at home.
Choose comfortable lighting levels and avoid prolonged exposure near large sunny windows or extremely bright task lighting. If you experience any skin redness, swelling, or blistering, contact our office immediately, as this may indicate a light sensitivity reaction.
Most side effects from combination therapy are mild and temporary. You may experience light sensitivity, blurred vision, eye irritation, or mild discomfort for a few days after treatment.
- Eye redness or a gritty sensation typically resolves within two to three days
- Temporary vision changes such as dark spots or wavy lines may persist for one to two weeks
- Mild tearing, scratchiness, or a small red spot on the white of the eye from the injection usually improve over several days
- Headache or back pain from the PDT infusion generally fades within 24 hours
These common effects are distinct from serious warning signs and can be managed with rest and any medications we provide.
While uncommon, both intravitreal injections and PDT carry serious risks that you should understand before treatment. Your retina specialist will review these with you and answer any questions.
Rare but serious risks of intravitreal anti-VEGF injection include:
- Endophthalmitis, a severe infection inside the eye that can cause vision loss
- Retinal detachment or retinal tear
- Significant inflammation inside the eye
- Vitreous hemorrhage or bleeding within the eye
- Injury to the lens causing cataract
- Sustained elevation of eye pressure
- Very rarely, arterial thromboembolic events such as stroke or heart attack
Rare but serious risks of photodynamic therapy include:
- Sudden or severe vision decrease, which can occur immediately or develop over days
- Choroidal ischemia or reduced blood flow to deeper eye structures
- Retinal pigment epithelium tear in certain types of neovascularization
- Severe photosensitivity reactions with skin blistering if light precautions are not followed
- Infusion site injury if the verteporfin leaks outside the vein during injection
- Rare hypersensitivity or allergic reactions to the medication
We will schedule your first follow-up visit within one to four weeks after your combination treatment to check your response. During this visit, we repeat imaging tests to measure changes in fluid and assess the health of your retina.
Based on your results, we determine whether you need additional anti-VEGF injections and how frequently you should return. Some patients need ongoing injections every four to eight weeks, while others can extend the time between treatments once their condition stabilizes.
While serious complications are rare, certain symptoms require immediate attention. Contact our office or seek emergency care if you experience sudden vision loss, worsening eye pain, increasing redness, worsening or new floaters, increasing light sensitivity, or a curtain or shadow across your vision.
These signs may indicate infection, retinal detachment, or other urgent problems. The key infection warning signs are worsening pain, worsening redness, and decreasing vision in the hours or days after your injection. Also call us immediately if you develop severe skin reactions with blistering or swelling after PDT, if the verteporfin infusion site becomes very painful or swollen, or if you experience persistent vomiting, hives, trouble breathing, or other signs of a severe allergic reaction after receiving angiography dye.
Frequently Asked Questions
For most retinal conditions today, anti-VEGF injections alone provide excellent results and are the standard of care. Combination therapy may offer advantages in specific cases such as polypoidal choroidal vasculopathy, where studies have shown that adding PDT can improve vessel closure rates and reduce recurrence in some patients. Your individual response and the characteristics of your condition will guide our recommendation.
The PDT component of combination therapy is usually performed once or occasionally repeated if needed, while anti-VEGF injections are given on an ongoing basis. Many patients require injections every four to twelve weeks depending on how their retina responds. We tailor your treatment plan to your specific needs and adjust the frequency based on your follow-up visits and imaging results.
Coverage for combination therapy varies by insurance plan and depends on medical necessity and the specific diagnosis. Most plans cover anti-VEGF injections for approved retinal conditions, and PDT may be covered when documentation supports its use for certain diagnoses. Our office can help verify your benefits and work with your insurance company to obtain any necessary prior authorizations.
You should not drive yourself home after receiving combination therapy. Both the dilating drops and the treatments themselves can cause temporary vision changes that make driving unsafe. Because PDT requires light avoidance, you will also need to limit your exposure during the trip home, so having a driver who can assist you is essential.
If combination therapy does not adequately control your condition, we have several options to consider. We may adjust the type or frequency of anti-VEGF medication, try a different anti-VEGF drug, or explore other strategies such as supplemental laser treatment in select cases. Ongoing research continues to bring new therapies to the field, and we stay current with emerging treatments that may benefit patients with resistant disease.
Getting Help for Combination Therapy with Anti-VEGF and PDT
If you are experiencing vision changes or have been told you may need combination therapy, we encourage you to schedule a comprehensive eye examination. Our eye doctor will evaluate your retina, discuss all available treatment options, and create a personalized care plan that addresses your specific condition and goals.