Diabetic Retinopathy: What Every Patient Needs to Know
Understanding Diabetic Retinopathy
Diabetic retinopathy is damage to the blood vessels inside the retina, the light-sensitive tissue at the back of the eye, caused by long-term high blood sugar. It is one of the leading causes of vision loss in adults with diabetes. Understanding how the disease develops helps explain why early detection matters so much.
Chronic high blood sugar weakens the walls of the tiny blood vessels that supply the retina. Over time, these vessels may swell, leak fluid, or close off entirely. The retina responds by releasing a protein called vascular endothelial growth factor, or VEGF. VEGF signals the eye to grow new blood vessels, but these new vessels are fragile, prone to bleeding, and can cause serious damage.
Diabetic retinopathy progresses through two broad stages that your specialist will monitor closely.
- Nonproliferative diabetic retinopathy (NPDR) is the earlier stage. It includes small bulges in blood vessel walls called microaneurysms, areas of bleeding within the retina, and vessel swelling. No abnormal new vessels have grown yet.
- Proliferative diabetic retinopathy (PDR) is the advanced stage. The retina becomes so starved of oxygen that abnormal new vessels begin to grow. These vessels can bleed into the vitreous, the gel-like fluid filling the inside of the eye, and cause scar tissue that may pull the retina away from the back of the eye.
Diabetic macular edema, or DME, is swelling in the macula, the central part of the retina responsible for sharp, detailed vision. DME can occur at any stage of diabetic retinopathy. When fluid leaks into the macula, it causes blurred or distorted central vision. When the very center of the macula is involved, it poses the greatest threat to reading, driving, and recognizing faces.
Who Is at Risk
Anyone with diabetes is at some risk for diabetic retinopathy, but certain factors increase both the likelihood and the severity of the disease. Identifying these risk factors helps determine how often a person should be screened.
The longer a person has had diabetes, the greater the risk. People who have had diabetes for 15 years or more are significantly more likely to develop retinopathy, and far more likely to develop the severe form, compared to those recently diagnosed.
- Chronic high blood sugar, also called poor glycemic control
- High blood pressure
- High cholesterol or other abnormalities in blood fats
- Kidney disease related to diabetes
Pregnant women with pre-existing diabetes face an increased risk of rapid progression of diabetic retinopathy. An eye exam early in pregnancy and close monitoring throughout is important for these patients. Women who develop gestational diabetes, a form of diabetes that begins during pregnancy, do not require a separate diabetic retinopathy exam for that condition alone.
Adolescents going through puberty may also experience faster progression of the disease, making closer follow-up during this stage important.
There is growing evidence that rapidly tightening blood sugar control can sometimes accelerate the onset of diabetic retinopathy, particularly in patients who previously had poor control. This has been observed with newer glucose-lowering medications such as semaglutide. Patients starting these treatments may benefit from a baseline retinal exam and closer monitoring, especially in the first year of treatment.
Symptoms to Watch For
One of the most important things to understand about diabetic retinopathy is that it often causes no noticeable symptoms in its early stages. By the time vision changes appear, significant damage may already have occurred.
Many patients feel their vision is perfectly normal even when significant changes are happening inside the eye. This is the primary reason that regular screening is so important for everyone with diabetes, not just those who notice a problem. Damage can accumulate silently for months or years.
As diabetic retinopathy progresses, patients may notice changes such as blurred or fluctuating vision, dark spots, or floaters drifting across their field of view. Colors may appear washed out, and night vision may worsen. When diabetic macular edema is present, straight lines may appear wavy and reading can become noticeably harder.
Some symptoms indicate a serious problem that requires immediate evaluation. Do not wait for a scheduled appointment if you experience any of the following.
- A sudden increase in floaters or flashes of light
- A shadow or dark curtain across part of your vision
- Sudden vision loss in one eye
These could signal a vitreous hemorrhage, meaning bleeding inside the eye, or a retinal detachment. Both conditions require prompt treatment to protect vision.
Diagnosis and Screening
Regular eye exams are the most reliable way to detect diabetic retinopathy before it causes lasting damage. Your specialist will use a combination of clinical examination and advanced imaging to assess your retinal health.
People with type 1 diabetes should begin annual retinal screening five years after diagnosis. People with type 2 diabetes should have their first screening at the time of diagnosis and at least once every year after that. Those with known risk factors or existing retinal changes may need more frequent exams, as determined by their specialist.
The standard way to evaluate the retina is a comprehensive dilated eye exam. Eye drops are used to widen the pupil so the specialist can see clearly into the back of the eye. During this exam, the specialist looks for microaneurysms, bleeding, swelling, and any signs of abnormal blood vessel growth.
Beyond the standard exam, several imaging tools give our specialists a more detailed picture of the retina's condition.
- Optical coherence tomography (OCT) creates detailed cross-sectional images of the retina to measure swelling and detect fluid in the macula.
- Fluorescein angiography uses a dye injected into a vein to highlight leaking or blocked blood vessels throughout the retina.
- Electroretinography (ERG) measures the electrical response of the retina to light and has been incorporated into updated clinical guidelines for evaluating diabetic retinopathy.
Treatment Options
The right treatment for diabetic retinopathy depends on the stage of the disease and whether diabetic macular edema is present. Our specialists use the most current, evidence-based approaches to protect and preserve your vision.
Anti-VEGF medications are the primary treatment for center-involved diabetic macular edema with vision loss and for proliferative diabetic retinopathy. These medications block vascular endothelial growth factor, reducing abnormal blood vessel growth and leakage. They are given as intravitreal injections, meaning they are injected directly into the eye after numbing drops are applied.
Several anti-VEGF agents are used in retina care. Eylea (aflibercept) is among the most commonly used. A high-dose formulation called Eylea HD was approved with dosing intervals up to five months for DME. Vabysmo (faricimab) targets both VEGF and another protein called angiopoietin-2, and can be given at intervals of up to 16 weeks for some patients. Lucentis (ranibizumab) was the first anti-VEGF medication approved for eye use and is also a well-established option.
Avastin (bevacizumab) is FDA-approved for certain cancers but is widely used off-label by retina specialists for diabetic macular edema and diabetic retinopathy. It works through the same VEGF-blocking mechanism and is typically given every four to six weeks. Patients should understand that its use for eye conditions is off-label, meaning it has not received formal FDA approval for this purpose.
Susvimo (ranibizumab injection 100 mg/mL) is the first FDA-approved continuous delivery treatment for diabetic retinopathy. A small, refillable implant is surgically placed in the eye and delivers medication on an ongoing basis, with refills typically needed approximately every nine months. This approach may reduce the number of office visits needed for some patients.
Panretinal photocoagulation, or PRP, is a laser procedure used primarily for proliferative diabetic retinopathy. The specialist applies a pattern of small laser spots to the peripheral retina, reducing the oxygen demand that drives abnormal blood vessel growth. Focal or grid laser may also be used in selected cases of diabetic macular edema where injection therapy alone is not sufficient.
Vitrectomy is a surgical procedure to remove the vitreous gel from inside the eye. It may be necessary when there is significant bleeding into the vitreous that does not clear on its own, or when scar tissue is pulling on the retina and threatening a detachment. During the procedure, the surgeon removes the gel along with blood or scar tissue and replaces it with a clear solution or gas bubble to support healing.
What to Expect During Treatment
Starting treatment for diabetic retinopathy raises many questions. Knowing what the process involves can help you feel prepared and confident about your care.
When diabetic retinopathy is detected and treated early, current treatment strategies may be highly effective in preventing severe vision loss. Anti-VEGF injections can reduce the severity of diabetic retinopathy and in some cases lead to measurable improvement on imaging. However, outcomes depend on how advanced the disease is when treatment begins, which is why regular screening matters so much.
Most anti-VEGF injection visits take less than an hour from start to finish. Anesthetic drops are applied to numb the eye before the injection, so most patients experience pressure or mild discomfort rather than sharp pain. Some temporary redness, soreness, or a gritty sensation may follow and typically resolves within a day or two. Most patients find the procedure more comfortable than they expected.
Diabetic retinopathy is a chronic condition that requires ongoing care even after successful treatment. Your specialist will set a follow-up schedule based on the severity of your disease and your response to treatment. Staying consistent with these appointments is one of the most important things you can do to protect your long-term vision.
Living Well With Diabetic Retinopathy
Medical treatment works best when it is supported by healthy habits and proactive self-care. There are meaningful steps you can take between appointments to help slow the progression of this disease.
Keeping blood sugar levels within your target range is one of the most powerful ways to slow diabetic retinopathy. High blood pressure and elevated cholesterol also accelerate damage to retinal blood vessels. Working closely with your primary care provider or endocrinologist to manage these numbers supports the work your retina specialist is doing to protect your eyes.
Because diabetic retinopathy can worsen without any warning symptoms, skipping or delaying scheduled exams allows the disease to advance quietly. If you notice any new vision changes between appointments, such as new floaters, blurred vision, or changes in how you see colors, contact your specialist promptly rather than waiting for your next scheduled visit.
A diagnosis of diabetic retinopathy can feel overwhelming. It is completely normal to feel anxious or frustrated, and many patients benefit from connecting with diabetes support groups or counseling services. If vision loss has already affected daily activities, low-vision rehabilitation services can offer practical tools and strategies. Staying informed and actively involved in your care can make a real difference in how you feel about the road ahead.
When to See a Retina Specialist
Knowing when to seek specialist care, and how urgently, can protect your vision at every stage of this disease. The following guidance is useful for patients and for primary care providers or optometrists who are coordinating referrals.
Primary care providers and optometrists are often the first to identify signs of diabetic retinopathy during routine exams. The following findings should prompt referral to a retina specialist.
- Any level of macular edema detected on exam or imaging
- Severe nonproliferative diabetic retinopathy, which is a precursor to the proliferative stage
- Any proliferative diabetic retinopathy, including the presence of new abnormal blood vessels
- Visual acuity worse than 20/40 or reported symptomatic vision changes
- Neovascularization of the iris or angle, meaning new blood vessel growth in the front of the eye, which requires urgent referral
Urgency depends on the specific findings. High-risk proliferative diabetic retinopathy, including large areas of new vessel growth on the optic disc or any new vessel growth accompanied by bleeding, should generally be referred within 24 to 48 hours. Lower-risk proliferative disease may be referred within two to four weeks. New vessel growth in the front part of the eye requires urgent attention because prompt treatment may prevent severe complications such as neovascular glaucoma, a condition that can cause significant vision loss.
Some patients benefit from earlier or more frequent retinal evaluations than the standard annual schedule. These include pregnant women with pre-existing diabetes, adolescents during puberty, and patients starting rapid glucose-lowering therapies. Anyone with a history of long-standing diabetes or consistently poor blood sugar control should also be considered for earlier baseline evaluation. When there is any uncertainty, a referral to a retina specialist is always a reasonable, proactive step.
Frequently Asked Questions
Here are answers to some of the most common questions we hear from patients and referring providers about diabetic retinopathy.
Yes, and this is one of the most important points to understand. Significant retinal damage can accumulate for years without any noticeable change in how clearly you see. By the time symptoms appear, the disease may already be in an advanced stage. This is exactly why annual dilated eye exams are recommended for all people with diabetes, even those who feel their vision is perfectly normal.
Progression varies from person to person. Some patients remain in the mild or moderate stage for many years, while others advance to a vision-threatening stage within months. The speed of progression is heavily influenced by how well blood sugar, blood pressure, and cholesterol are controlled. Pregnancy, puberty, and rapid changes in blood sugar management can all accelerate progression, which is why more frequent monitoring is recommended during these periods.
This is one of the most common concerns patients bring to us, and the reassuring answer is that most people find the procedure far more comfortable than they anticipated. Numbing drops are applied before the injection, so the sensation is usually one of mild pressure rather than pain. Any soreness or redness afterward typically fades within a day or two. If anxiety about the procedure is a concern, our team is happy to walk you through every step beforehand.
Without treatment, diabetic retinopathy can lead to permanent and severe vision loss. Proliferative disease can cause bleeding inside the eye, scar tissue formation, and retinal detachment, all of which can cause irreversible damage. Diabetic macular edema can destroy the central vision needed for reading, driving, and recognizing people. Starting treatment before the disease reaches an advanced stage offers the best chance of preserving long-term vision.
If you have started a medication that causes rapid improvement in blood sugar control, such as semaglutide, it is worth discussing your eye health with both your diabetes care provider and a retina specialist. For patients who previously had elevated blood sugar levels, a faster reduction can sometimes accelerate the early development of diabetic retinopathy. A baseline retinal exam before starting the medication and closer monitoring during the first year of treatment may be recommended based on your individual history.
Treatment timelines vary widely depending on the type and severity of your condition and how well your eyes respond. Some patients require ongoing injections to maintain their vision, while others may be able to space out visits as the disease stabilizes. Newer treatments with longer dosing intervals, including some that allow visits every three to five months, have made ongoing treatment more manageable for many patients. Your specialist will continually reassess your treatment plan and adjust it based on your response.
Schedule Your Eye Exam Today
At Associated Eye Physicians & Surgeons, our team of specialists is dedicated to providing expert, compassionate care for patients with diabetic eye disease across our four convenient locations in New Jersey. We use advanced diagnostic technology and the latest treatment options to help protect your vision at every stage of diabetic retinopathy. Whether you are due for a routine screening or have concerns about your vision, we encourage you to schedule an appointment so we can evaluate your eye health and create a care plan tailored to you.
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