Diabetic Retinopathy: Protecting Your Vision
Understanding Diabetic Retinopathy
Diabetic retinopathy develops when high blood sugar damages the delicate blood vessels inside the eye. Knowing how this process unfolds can help you take the right steps to protect your vision before serious harm occurs.
Diabetic retinopathy is an eye disease caused by diabetes. Over time, elevated blood sugar levels damage the tiny blood vessels that supply the retina, the light-sensitive layer of tissue at the back of the eye that sends visual signals to the brain through the optic nerve. When these vessels are damaged, they can leak fluid, swell, or close off entirely, threatening the clarity of your vision.
Damage begins gradually as high blood sugar weakens the walls of the small vessels nourishing the retina. These weakened vessels may begin to leak blood or fluid into surrounding tissue. As circulation worsens, the eye releases chemical signals called vascular endothelial growth factor, or VEGF, which trigger the growth of new, abnormal blood vessels on the retina's surface. This process is called neovascularization, and it marks a more dangerous stage of the disease.
Diabetic retinopathy progresses through two main stages. The first is non-proliferative diabetic retinopathy, or NPDR. In this stage, the blood vessels weaken, develop tiny bulges called microaneurysms, and may leak fluid or blood into the retina. Many people notice no changes to their vision during this stage, which is why regular screening is so important.
The second and more advanced stage is proliferative diabetic retinopathy, or PDR. In PDR, the retina grows new abnormal blood vessels that are fragile and prone to breaking. These vessels can bleed into the vitreous (the gel-like substance filling the inside of the eye), form scar tissue, or pull on the retina causing a retinal detachment. In severe cases, abnormal vessel growth on the iris (the colored part of the eye) can block the eye's natural drainage, leading to dangerously high eye pressure.
Diabetic macular edema, or DME, occurs when damaged blood vessels leak fluid into the macula. The macula is the central portion of the retina responsible for the sharp, detailed vision used for reading and recognizing faces. When fluid accumulates in this area, the macula swells and vision becomes blurry or distorted. DME can develop at any stage of diabetic retinopathy and is one of the most common causes of vision loss in people with diabetes.
Who Is at Risk
Diabetic retinopathy can affect anyone living with diabetes, though certain factors raise the risk of developing or worsening the condition. Understanding your personal risk profile helps you and your care team stay ahead of potential complications.
Anyone diagnosed with diabetes is at risk, including those with type 1, type 2, or gestational diabetes. Gestational diabetes is a form of the condition that develops during pregnancy. Risk increases with the duration of diabetes, and over time, more than half of people living with diabetes will develop some degree of diabetic retinopathy.
Several factors increase the likelihood of developing diabetic retinopathy or accelerating its progression. Poor blood sugar control and long-standing diabetes are the most strongly linked factors, but other conditions also play an important role.
- Long duration of diabetes
- Poorly controlled blood sugar levels
- High blood pressure
- High cholesterol
- Tobacco use
- Pregnancy in women with pre-existing diabetes
Addressing these risk factors through medical management and lifestyle changes can meaningfully slow the progression of retinal damage.
Women with pre-existing diabetes who become pregnant face a heightened risk of rapid changes in their retinas. Hormonal shifts and fluctuations in blood sugar during pregnancy can accelerate retinal damage significantly. If you have diabetes and are pregnant or planning to become pregnant, a dilated eye exam should be scheduled as early as possible. Our retina specialists can monitor your eyes throughout pregnancy and act quickly if treatment is needed.
Signs and Symptoms
One of the most challenging aspects of diabetic retinopathy is that it often causes no noticeable symptoms in its early stages. Knowing what to look for as the condition advances can prompt you to seek care before serious vision loss occurs.
In the early stages, most people with diabetic retinopathy experience no vision changes at all. Some notice mild and intermittent difficulties such as trouble reading small text or seeing objects at a distance. These subtle changes can be easy to dismiss, which is why scheduled exams are far more reliable than waiting for symptoms to appear.
As the disease progresses, symptoms become harder to ignore. Bleeding into the vitreous can cause dark floating spots, streaks, or what appears to be cobwebs drifting across your field of vision. Vision may become significantly blurred or distorted, particularly if the macula is affected by fluid buildup.
Certain changes in vision signal a potential emergency and should never be ignored. If you experience any of the following symptoms, contact a retina specialist immediately or go to an emergency room without delay.
- A sudden increase in floaters or dark spots in your vision
- Flashes of light in one or both eyes
- A dark curtain, shadow, or veil moving across your visual field
- Sudden, severe vision loss in one eye
These symptoms may indicate a vitreous hemorrhage or retinal detachment, both of which require urgent treatment to preserve sight.
Diagnosis and Testing
Diagnosing diabetic retinopathy requires a thorough examination of the retina and its blood vessels. Our specialists use several proven diagnostic tools to get a complete picture of your eye health.
A comprehensive dilated eye exam is the cornerstone of diabetic retinopathy detection. During this exam, special drops are used to widen your pupils so the retina specialist can clearly see the interior of your eye. The specialist examines the retina for leaking vessels, swelling, fatty deposits, abnormal vessel growth, and scar tissue. Because the disease can advance without symptoms, regular dilated exams are essential for every person living with diabetes.
Optical coherence tomography, or OCT, is a painless, non-invasive imaging scan that produces detailed cross-sectional images of the retina. This technology measures the thickness of retinal layers and detects fluid accumulation in the macula with high precision. OCT is especially useful for diagnosing and tracking diabetic macular edema, and the scan itself takes only a few minutes.
Fluorescein angiography is an imaging test that uses a small amount of yellow dye injected into a vein in your arm. As the dye travels through the blood vessels in your eye, a specialized camera takes a rapid series of photographs. This test reveals areas where vessels are leaking, blocked, or growing abnormally, and it helps your retina specialist determine the most appropriate treatment approach.
Treatment Options
Treatment for diabetic retinopathy has advanced considerably, and there are now several highly effective options depending on the stage and type of the condition. Your retina specialist will recommend a plan tailored to your specific situation.
Anti-VEGF injections are the most widely used treatment for both diabetic retinopathy and diabetic macular edema. These medications are delivered directly into the vitreous cavity of the eye and work by blocking the VEGF signals that drive abnormal vessel growth and fluid leakage. Research has consistently shown that anti-VEGF therapy produces better vision outcomes than laser treatment alone for DME.
Several anti-VEGF medications are currently available and FDA-approved for diabetic eye disease.
- Eylea (aflibercept): Approved for diabetic retinopathy and DME, typically given every 4 to 8 weeks after an initial loading phase
- Eylea HD (high-dose aflibercept): A higher-dose formulation that may allow intervals of 8 to 16 weeks after loading doses
- Lucentis (ranibizumab): Approved for diabetic retinopathy and generally given every 4 weeks
- Avastin (bevacizumab): Used off-label for diabetic retinopathy and DME, typically given every 4 to 6 weeks
- Vabysmo (faricimab): A bispecific antibody approved for DME that may allow treatment intervals up to every 16 weeks in certain patients
Your retina specialist will select the medication and dosing schedule best suited to your condition and response to treatment.
Laser photocoagulation (a thermal laser applied to the retina) has been used for decades to treat diabetic retinopathy and remains an important part of care for certain patients. Panretinal photocoagulation, or PRP, involves placing hundreds of small laser spots across the peripheral retina to reduce oxygen demand and stop abnormal blood vessel growth in proliferative diabetic retinopathy. Focal laser treatment targets specific areas of leakage near the macula. While anti-VEGF injections have become the preferred first-line therapy for DME, laser treatment continues to play a meaningful role in managing proliferative disease.
Vitrectomy is a surgical procedure to remove the vitreous gel from inside the eye and is recommended for advanced cases of diabetic retinopathy. It is most often needed when significant bleeding into the vitreous does not clear on its own, or when scar tissue pulls on the retina and creates a risk of retinal detachment. During the procedure, the retina specialist removes the vitreous and replaces it with a saline solution or gas bubble to stabilize the eye. Vitrectomy can be performed in a hospital or an outpatient surgical center.
For patients who require frequent injections, sustained-release options offer an alternative approach to long-term management. Susvimo (ranibizumab injection) is an FDA-approved implant placed inside the eye that continuously releases medication and requires refills approximately every nine months. Steroid implants such as Ozurdex (dexamethasone implant) may be used for DME, particularly in patients who do not respond adequately to anti-VEGF therapy. Your retina specialist will determine whether these options are appropriate for your case.
Biosimilars are medications that are highly similar to FDA-approved biologic drugs and undergo rigorous testing to confirm that they are as safe and effective as the original treatments. Ahzantive (aflibercept-mrbb) is a biosimilar to Eylea that has received FDA approval for use in diabetic retinopathy and DME. Other approved biosimilars include Byooviz (ranibizumab-nuna) and Cimerli (ranibizumab-eqrn). These options expand access to effective retinal therapies and provide additional choices for patients and their physicians.
What to Expect During Treatment
Starting treatment for diabetic retinopathy can feel daunting, but knowing what to expect makes the process much easier to navigate. Most treatments are performed in our office and are well tolerated by patients.
Intravitreal injections are performed in the retina specialist's office and take only a few minutes from start to finish. The eye is numbed with anesthetic drops and cleaned with an antiseptic solution before the injection is given. The injection itself takes only a few seconds. Most patients feel a sensation of pressure rather than sharp pain. After the procedure, you may notice mild redness, irritation, or temporary floaters that typically resolve within a few days.
Treatment for diabetic retinopathy is typically ongoing and requires consistent follow-up over time. Anti-VEGF injections are usually given monthly during an initial loading phase, and the interval between treatments is then extended based on how your eyes respond. Your retina specialist will monitor your progress with regular exams and OCT scans. Attending all scheduled appointments is one of the most important things you can do to preserve your vision.
Treatment can stabilize vision and in many cases lead to measurable improvement. However, outcomes vary from person to person, and damage that has already occurred to the retina may not be fully reversible. The primary goal of treatment is to prevent further vision loss and maintain as much functional sight as possible. Early detection and consistent care offer the best opportunity for a favorable long-term outcome.
Living With Diabetic Retinopathy
Managing diabetic retinopathy is an ongoing process that extends beyond office visits. Daily habits, medical management, and a supportive care team all play important roles in protecting your vision over the long term.
Keeping blood sugar, blood pressure, and cholesterol within healthy ranges is the most powerful step you can take to slow the progression of diabetic retinopathy. Work closely with your primary care physician or endocrinologist to stay within the blood sugar targets recommended for you. Even modest improvements in blood sugar control can have a meaningful impact on your eye health over time.
Because diabetic retinopathy can develop and worsen without any noticeable symptoms, regular dilated eye exams are essential for anyone living with diabetes. Most clinical guidelines recommend a dilated eye exam at least once a year. Your retina specialist may recommend more frequent visits depending on the severity of your condition. Consistent monitoring allows problems to be caught early, when treatment is most effective.
Healthy daily habits support better blood sugar control and reduce the risk of retinal damage worsening. A balanced diet, regular physical activity, and maintaining a healthy weight all contribute to more stable glucose levels. If you smoke, quitting is one of the most protective steps you can take for your eyes and your overall health. For those who have experienced some vision loss, low-vision aids such as magnifying devices, large-print materials, and improved home lighting can help with daily tasks.
A diagnosis of diabetic retinopathy can bring a range of emotions, including worry, frustration, and uncertainty about the future. These feelings are completely understandable. Resources from organizations such as the American Diabetes Association and the BrightFocus Foundation can provide information and community support. Staying actively engaged in your care plan helps you feel more in control and better prepared to protect your sight.
When to See a Retina Specialist
Knowing when to seek care is just as important as understanding the condition itself. Whether you need a routine baseline exam or have noticed sudden changes in your vision, prompt action protects your eyes.
If you have been diagnosed with diabetes, your primary care physician or optometrist should refer you to a retina specialist for a baseline dilated eye exam. Annual follow-up exams are recommended even when your vision feels completely normal. Women with diabetes who are planning a pregnancy or who are currently pregnant should schedule an exam as early as possible, since hormonal changes can accelerate retinal changes during this period.
Some vision changes cannot wait for a scheduled appointment. Contact a retina specialist or go to an emergency room right away if you notice a sudden increase in floaters or dark spots, flashes of light in one or both eyes, a shadow or curtain moving across part of your visual field, or a sudden loss of vision in one eye. These symptoms may indicate a vitreous hemorrhage (bleeding inside the eye) or a retinal detachment, both of which can cause permanent vision loss without prompt treatment.
Frequently Asked Questions
These answers address common concerns and practical questions that go beyond what is covered in detail above.
Some improvements in vision are possible with treatment, particularly when the condition is caught early and care begins promptly. However, diabetic retinopathy is not fully reversible in all cases, because some structural damage to the retina is permanent. The distinction matters practically: if your goal is to maintain the vision you have now, starting treatment before significant damage occurs gives you the strongest outcome. The longer abnormal changes go untreated, the narrower the window for meaningful recovery becomes.
Injection frequency depends on the specific medication used, the severity of your disease, and how well your eyes respond to treatment. Most patients begin with a more intensive loading phase, then transition to longer intervals as the condition stabilizes. Some of the newer medications allow intervals of up to 16 weeks for qualifying patients. Your retina specialist will adjust your schedule based on what the imaging and exam findings show at each visit, so the plan evolves with your eyes rather than following a fixed calendar.
It is possible for diabetic retinopathy to develop in one eye or in both, and over time, both eyes are commonly affected to some degree. One eye may be more severely involved than the other, and each eye may respond differently to treatment. This is why your retina specialist examines both eyes thoroughly at every visit and may recommend different treatment approaches for each one. Never assume that a good result in one eye means the other eye is unaffected.
Without treatment, diabetic retinopathy can progress to stages that cause severe, long-lasting vision loss. Proliferative diabetic retinopathy can lead to vitreous hemorrhage (significant bleeding inside the eye), traction retinal detachment (when scar tissue pulls the retina out of position), and neovascular glaucoma (dangerously elevated eye pressure caused by abnormal vessel growth on the iris). Each of these complications is far harder to treat than earlier-stage disease and may result in permanent vision impairment even with aggressive intervention. This is why consistent monitoring is not optional for people with diabetes.
While there is no guaranteed way to prevent diabetic retinopathy entirely, you can substantially reduce your risk. Tight control of blood sugar, blood pressure, and cholesterol remains the most evidence-based approach to prevention. Avoiding tobacco and maintaining a healthy weight add further protection. Annual dilated eye exams ensure that if changes do develop, they are identified and addressed at the earliest and most treatable stage. Beginning care with a retina specialist shortly after a diabetes diagnosis, even before any eye symptoms appear, is one of the most proactive decisions you can make for your long-term vision.
Our retina subspecialists, Dr. Gaurav Gupta and Dr. Pranjal Thakuria, lead the care of patients with diabetic retinopathy and other retinal conditions. Both are fellowship-trained in vitreoretinal disease and have extensive experience managing every stage of diabetic eye disease, including complex cases requiring surgery. Your care plan is always physician-directed, and our team works closely with your primary care physician and endocrinologist to coordinate the full picture of your diabetes management.
Schedule Your Diabetic Eye Exam
If you have diabetes, protecting your vision starts with a dilated eye exam from a qualified specialist. Our retina team at Rhode Island Eye Institute is experienced in diagnosing and treating every stage of diabetic retinopathy, with the advanced imaging and treatment technology needed to provide thorough, personalized care. With multiple locations across Rhode Island, getting started is straightforward, and our team is here to guide you every step of the way. We look forward to partnering with you in preserving your sight for the long term.