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Proliferative Diabetic Retinopathy: Protecting Your Vision
Who Is at Risk
PDR is diabetic retinopathy's most severe form, and it becomes more likely the longer a person lives with diabetes. Certain factors increase the risk of reaching this advanced stage, and understanding them can help guide prevention and screening decisions.
The length of time a person has had diabetes is one of the strongest predictors of developing PDR. After 15 years of living with type 1 diabetes, roughly 14 to 17 percent of patients develop proliferative disease. After 20 years with diabetes, the vast majority of patients with type 1 and a substantial portion of those with type 2 will show some degree of retinopathy.
Poorly controlled blood sugar is directly linked to faster progression of diabetic retinopathy. Higher blood sugar levels over time, reflected by a higher hemoglobin A1c, accelerate damage to the retinal blood vessels. Elevated blood pressure also increases risk, particularly in younger patients with diabetes.
Several other conditions and circumstances may further increase the chance that retinopathy will progress to the proliferative stage.
- High cholesterol
- Kidney disease related to diabetes
- Pregnancy in women with pre-existing diabetes
- Smoking
Symptoms to Watch For
One of the most dangerous aspects of diabetic retinopathy is that it often develops without any noticeable symptoms in its early stages. By the time PDR causes obvious vision changes, significant damage may already be present. Knowing what to watch for can make a critical difference.
Diabetic retinopathy can progress through multiple stages over years without causing any symptoms the patient can feel or see. This is why annual dilated eye exams are essential for every person living with diabetes, regardless of how well their blood sugar is controlled.
When PDR reaches an advanced stage, symptoms can appear suddenly or develop gradually. Any of the following changes in vision deserve prompt attention.
- New floaters, which appear as spots or dark strings drifting through your field of view
- Flashes of light in one eye
- Blurred or fluctuating vision
- Dark or empty areas in the visual field
- A curtain or shadow spreading across the vision
- Sudden, significant vision loss in one eye
A sudden increase in floaters, flashes of light, a dark shadow moving across your vision, or sudden vision loss in one eye may indicate vitreous hemorrhage or retinal detachment. These are medical emergencies. See a retina specialist or go to the nearest emergency room right away if you experience any of these symptoms.
How PDR Is Diagnosed
Diagnosing PDR requires a thorough examination by a retina specialist, along with advanced imaging to understand the extent and severity of the disease. Our team uses a full range of diagnostic tools to guide each patient's care.
A comprehensive dilated eye exam is the cornerstone of diagnosing diabetic retinopathy. Drops are placed in the eye to widen the pupil, giving the retina specialist a clear view of the entire retina. The specialist looks for abnormal blood vessel growth, bleeding, scar tissue, and swelling.
During fluorescein angiography, a small amount of dye is injected into a vein in the arm. Photographs are taken as the dye moves through the retinal blood vessels. This reveals areas of poor blood flow, leaking vessels, and abnormal new vessel growth that may not be visible in other ways.
OCT is a non-invasive scan that creates detailed cross-sectional images of the retina. It is especially useful for detecting swelling in the macula (the central area of the retina responsible for sharp vision) and for identifying areas where scar tissue may be pulling on the retina. OCT angiography maps retinal blood vessel structure without injected dye, helping our team identify neovascularization in detail.
Once PDR is diagnosed, regular follow-up visits are essential. Our team determines how often each patient needs to be seen based on the severity of their disease and how well it is responding to treatment. Patients with active PDR typically require more frequent monitoring to catch new bleeding or changes in traction before they progress further.
Treatment Options for PDR
Treatment for proliferative diabetic retinopathy is highly effective when started early, and our retina specialists offer the complete range of current therapies. The right approach depends on the severity of disease, whether complications such as vitreous hemorrhage or retinal detachment are present, and how the eye responds over time.
Anti-VEGF medications are now among the most important treatments for PDR. These drugs block the protein that drives abnormal blood vessel growth and leakage. They are delivered as intravitreal injections, meaning the medication is placed directly into the vitreous cavity of the eye using a very fine needle. Anti-VEGF agents used for PDR include Avastin (bevacizumab), Lucentis (ranibizumab), Eylea (aflibercept), and Vabysmo (faricimab).
Injections are typically given every four to eight weeks at the start of treatment. Clinical studies have shown that anti-VEGF therapy can improve visual acuity in some patients with PDR, in addition to stabilizing the disease. The number of injections needed varies by individual, and our team adjusts the schedule based on how the eye is responding.
Panretinal photocoagulation, also called PRP or scatter laser, has been a standard treatment for PDR for many years. During this procedure, a retina specialist applies hundreds to thousands of small laser burns to the outer areas of the retina. This reduces the retina's overall oxygen demand and lowers the chemical signals that drive abnormal vessel growth.
PRP does not restore vision that has already been lost. Its primary goal is to stabilize the disease and prevent further deterioration. Some patients notice mild reductions in side (peripheral) vision or night vision following laser treatment. These effects are generally considered an acceptable trade-off when the alternative is severe vision loss from uncontrolled PDR. PRP is sometimes combined with anti-VEGF injections for more complete treatment.
When diabetic macular edema (swelling in the central retina) accompanies PDR, or when an eye does not respond well to anti-VEGF therapy, steroid-based treatments may be considered. Options include triamcinolone acetonide and the Iluvien implant (fluocinolone acetonide), a small sustained-release device placed inside the eye that delivers medication over an extended period. Our team evaluates each case individually to determine whether a steroid-based approach is appropriate.
Vitrectomy is a surgical procedure in which the vitreous gel is removed from inside the eye. It is recommended when a vitreous hemorrhage does not clear on its own, or when scar tissue has caused a tractional retinal detachment. During vitrectomy, the surgeon removes the blood-filled vitreous, peels scar tissue away from the retina, and may apply laser treatment to stabilize the retina. In some cases, a gas bubble or silicone oil is placed inside the eye to hold the retina in position while it heals.
What Treatments Feel Like and What to Expect
Many patients have questions about what PDR treatments actually involve. Understanding the process ahead of time can make it easier to feel prepared and comfortable with each step of your care.
Anti-VEGF injections are performed in our office. The eye is numbed with anesthetic drops and the surface is cleaned with an antiseptic solution before the injection. The procedure takes only a few minutes. Most patients feel mild pressure during the injection but not sharp pain. Temporary side effects can include redness, a gritty feeling, or brief floaters after the injection, all of which typically resolve within a day or two.
PRP laser treatment is performed in the office and may be completed in one or more sessions. Numbing drops are used beforehand. Patients often describe the sensation as a mild aching or stinging. Vision may be slightly blurry for a day or two after treatment. Any changes in side vision or night vision from the laser develop gradually and are usually subtle compared to the vision loss PDR itself can cause if left untreated.
Vitrectomy is performed at an outpatient surgery center, generally under local anesthesia with sedation. Recovery time depends on the complexity of the surgery. If a gas bubble is placed inside the eye, you may need to maintain a specific head position for days or weeks while it works. Vision improvement after vitrectomy is gradual and may take weeks to months. Our team provides detailed instructions and schedules close follow-up to monitor healing.
Living Well With Proliferative Diabetic Retinopathy
A PDR diagnosis requires long-term attention, but many patients maintain meaningful vision for years with the right care. Daily habits and consistent follow-up both play an important role in protecting your sight over time.
Keeping blood sugar well controlled is the single most important step in slowing the progression of diabetic eye disease. Work with your diabetes care team to bring hemoglobin A1c levels into a range that is safe and achievable for you. Managing blood pressure and cholesterol levels also contributes meaningfully to retinal health.
Even after successful treatment, PDR requires ongoing monitoring. New abnormal blood vessels can develop, or previously treated vessels can begin to bleed again. Regular visits with a retina specialist allow problems to be caught and addressed before they cause further vision loss. Most patients with a history of PDR will need long-term follow-up care.
A vision-threatening diagnosis can be stressful, and it is completely normal to feel anxious about treatments or uncertain about the future. Support from family, diabetes educators, and low-vision rehabilitation specialists can be genuinely helpful. If some vision loss has already occurred, low-vision aids and adaptive training programs can assist with everyday tasks.
Frequently Asked Questions
Below are answers to questions we commonly hear from patients navigating a PDR diagnosis. These answers are meant to add practical guidance beyond what is covered in the sections above.
PDR cannot be reversed in the sense of returning the retina to a fully normal state. Treatment can halt disease progression and, in some cases, lead to measurable improvements in vision when bleeding clears or swelling responds to anti-VEGF therapy. However, retinal damage that has already occurred may be permanent. This is why beginning treatment before complications develop is so important, and why annual screening for all people with diabetes is not optional.
There is no single answer because treatment is individualized. Many patients receive a series of injections over the first several months, followed by ongoing treatments on a schedule based on how their eye is responding. Some patients with stable disease may eventually extend the time between injections. Newer agents and high-dose formulations may allow for longer intervals for some patients. Your retina specialist will re-evaluate your schedule at each visit and adjust it as needed.
Physical activity is generally beneficial for blood sugar control and overall health. However, for people with active PDR, certain high-intensity activities that involve heavy straining, breath-holding, or jarring movements may increase the risk of bleeding inside the eye. This does not mean exercise should be avoided entirely. It means you should discuss your specific activity plans with both your diabetes care team and your retina specialist so that guidance can be tailored to where your disease currently stands.
Small vitreous hemorrhages sometimes absorb over weeks to months without intervention. During that time, a retina specialist will monitor you closely and may use ultrasound imaging to evaluate the retina when bleeding blocks the view. If the hemorrhage is dense, persistent, or accompanied by signs of retinal detachment, vitrectomy surgery is typically recommended rather than waiting indefinitely. Delaying surgery when detachment is involved can reduce the chance of a good visual outcome.
For most patients with a history of PDR, long-term follow-up is necessary. Even when the disease appears stable, the underlying diabetes continues to affect the blood vessels throughout the body, including those in the retina. New areas of neovascularization can develop at any time. Regular monitoring is what allows our team to intervene early and minimize the risk of additional vision loss. The frequency of visits often decreases once disease is well controlled, but ongoing care is generally recommended.
Schedule a Visit With Our Retina Specialists
Atlantic Retina Center is a single-specialty vitreoretinal practice dedicated exclusively to the health of the retina, vitreous, and macula. Our team of fellowship-trained, board-certified retina specialists has the experience, tools, and technology to diagnose and treat every stage of diabetic retinopathy, including PDR. If you have diabetes and have not had a dilated eye exam recently, or if you are experiencing any new visual symptoms, we encourage you to reach out and schedule an evaluation at one of our five convenient clinic locations serving the Delmarva peninsula.