Do Eye Injections Cure Diabetic Eye Disease?
Understanding Diabetic Eye Disease
Diabetes can affect several parts of your eyes in different ways. The two most common conditions we see are diabetic retinopathy, which damages the blood vessels in your retina, and diabetic macular edema, which causes swelling in the center part of your retina responsible for sharp vision.
Both conditions can happen at the same time or separately. Your eye doctor will examine your retina to determine which type of diabetic eye disease you have and how advanced it is.
When your blood sugar stays too high for extended periods, it weakens the tiny blood vessels that supply oxygen to your retina. These damaged vessels can leak fluid or bleed, causing swelling and vision problems.
Over time, your body tries to grow new blood vessels to replace the damaged ones, but these new vessels are fragile and leak even more easily. This creates a cycle of damage that can lead to severe vision loss if not treated.
Anyone with diabetes can develop diabetic eye disease, but certain factors increase your risk. We see higher rates in patients who have had diabetes for many years, those with poorly controlled blood sugar, and individuals with high blood pressure or high cholesterol.
- People who have had diabetes for many years, especially those with type 1 diabetes
- Patients with A1C levels consistently above 7 percent
- Pregnant people with preexisting type 1 or type 2 diabetes (pregnancy can accelerate retinopathy)
- Individuals with kidney disease related to diabetes
- People who already have diabetic retinopathy in one eye
Many people with early diabetic eye disease have no symptoms at all, which is why regular eye exams are so important. When symptoms do appear, you might notice blurry vision that comes and goes, dark spots or floaters in your vision, difficulty seeing colors clearly, or blank areas in your field of vision.
These changes can be subtle at first and may seem to improve on their own, but that does not mean the disease has gone away. Even if your vision seems better, the underlying damage to your retina may still be progressing.
Some vision changes signal that you need to see an eye doctor right away. Contact us immediately if you experience sudden vision loss, a sudden increase in floaters that looks like a shower of spots, flashes of light in your vision, or a shadow or curtain covering part of your visual field.
These symptoms can indicate bleeding in your eye or retinal detachment, both of which require prompt treatment to prevent permanent vision loss. We would rather see you urgently for a false alarm than have you wait too long with a serious problem. If these symptoms occur after hours or you cannot reach the office, seek same-day emergency eye care or go to the emergency department.
Do Eye Injections Cure or Manage Diabetic Eye Disease?
The most common eye injections for diabetic eye disease are called anti-VEGF medications. VEGF stands for vascular endothelial growth factor, which is a protein your body produces that signals new blood vessels to grow.
- Aflibercept
- Ranibizumab
- Bevacizumab (used off-label)
- Faricimab
These medications block the VEGF protein to stop your eye from growing abnormal, leaky blood vessels. By reducing VEGF activity, the injections can stop fluid leakage and help existing swelling go down.
Some patients improve significantly, while others need combination therapy or different medications to control swelling.
When we inject anti-VEGF medication into your eye, it spreads throughout the vitreous gel and reaches your retina. The medication binds to VEGF proteins and prevents them from attaching to blood vessel cells, which stops the signal that causes vessel growth and leakage.
- Swelling in your macula begins to decrease within days to weeks
- Leakage typically decreases and retinal thickening can improve on OCT
- Abnormal new blood vessels may shrink or stop growing
- Vision often improves as the swelling goes down
Eye injections do not cure diabetic eye disease because they do not fix the underlying problem of high blood sugar damaging your blood vessels. Your body continues to produce VEGF as long as diabetes is affecting your retina, which means the disease will become active again once the medication wears off.
Think of injections as similar to taking insulin or other diabetes medications. Just as you need to manage your blood sugar continuously, you need to manage diabetic eye disease with repeated treatments to maintain the improvements you have gained.
When we say that injections control diabetic eye disease, we mean they can stop it from getting worse and often improve your vision. Many patients regain vision they had lost, while others maintain their current vision level and prevent further decline.
The goal is to keep your disease in a stable, inactive state. Some patients eventually need fewer injections if their disease becomes quiet, but most people require ongoing monitoring and treatment to protect their sight long term.
Diagnosing Diabetic Eye Disease and Determining If You Need Injections
Every diabetic eye exam should include dilation, where we use drops to widen your pupils so we can see your entire retina. During this exam, our eye doctor looks for signs of blood vessel damage, bleeding, swelling, and abnormal vessel growth.
We often take detailed photographs of your retina to document any changes and track how your condition evolves over time. These images help us compare your retina from visit to visit and make treatment decisions based on clear evidence of progression or improvement.
An OCT scan creates a cross-sectional image of your retina, similar to how an ultrasound creates images of a baby during pregnancy. This test shows us the layers of your retina and reveals even tiny amounts of swelling that we might not see with a regular exam.
- The scan takes only a few minutes and does not touch your eye
- We can measure the exact thickness of your macula in microns
- Repeat scans show whether swelling is improving with treatment
- OCT helps us decide when you need an injection and when you can wait
For this test, we inject a yellow dye called fluorescein into a vein in your arm, then take special photographs as the dye circulates through the blood vessels in your retina. The dye highlights areas where vessels are leaking or blocked and shows us abnormal vessel growth that needs treatment.
We do not perform this test on every visit, but it gives us valuable information when we first diagnose diabetic eye disease or when we need to plan laser treatment. The dye is eliminated through your kidneys, usually within about a day, and you may notice your urine looks bright yellow or orange during that time.
Some people feel briefly nauseated during or right after the injection. Allergic reactions are uncommon but can happen, so let us know if you have had any reaction to fluorescein or other contrast dyes in the past.
We may recommend eye injections if you have diabetic macular edema that affects the center of your retina, proliferative diabetic retinopathy with abnormal blood vessel growth, or significant retinal swelling that threatens your central vision. Not everyone with diabetic eye disease needs injections right away.
Patients with mild retinopathy and no swelling usually need only careful monitoring. Our eye doctor will discuss whether injections are appropriate for your specific situation based on your test results and vision symptoms.
The Eye Injection Treatment Process
Before your injection, continue taking all your regular medications unless we tell you otherwise. You may want to arrange for someone to drive you home, since your vision will be blurry from the dilating drops and the procedure itself.
Plan to spend about an hour at our office for your first injection appointment. We will answer all your questions, obtain your consent, and make sure you feel comfortable with the procedure before we begin.
We start by giving you numbing drops to make sure you do not feel pain during the injection. Next, we clean the surface of your eye and the skin around it with an antiseptic solution to prevent infection.
- We may place a small clip to hold your eyelids open gently
- You will feel pressure but not sharp pain when the needle enters
- The actual injection takes only a few seconds
- We rinse your eye with saline solution after the medication is in
- Your vision will be blurry immediately afterward but clears over hours
Most patients start with injections every four to eight weeks until their eye disease becomes stable. After your retina has improved and stayed dry for a period of time, we may be able to extend the time between injections to every two or three months.
Some people need injections less frequently over time, while others require them on a regular ongoing schedule. Your treatment plan depends on how your individual eyes respond and whether your diabetes control improves.
After your injection, you may notice your eye feels scratchy or irritated, your vision seems cloudy, or you see floaters that look like small dots or cobwebs. These effects are normal and usually go away within a day or two.
You can use artificial tears as often as needed for comfort. Avoid rubbing your eye, and do not get water directly in your eye for 24 hours, which means no swimming and being careful when you shower or wash your face.
Most patients tolerate eye injections very well with only minor temporary discomfort. You may experience some common, expected findings that typically resolve quickly.
- Scratchy or gritty feeling in your eye
- Small red spot on the white of your eye from a broken blood vessel
- Mild tearing or watering
- Temporary light sensitivity
- A few new small floaters
Serious side effects are rare but can include eye infection called endophthalmitis, retinal tear or detachment, inflammation inside the eye, sustained high eye pressure, bleeding inside the eye, and very rarely lens injury.
Call our office right away if you develop worsening eye pain, increasing redness, pus or discharge, new floaters or flashing lights, or vision loss after your injection. Severe pain, worsening redness, light sensitivity, or decreasing vision in the first 1 to 7 days needs same-day evaluation. If you cannot reach us, go to the emergency department.
Other Treatments That Work Alongside or Instead of Injections
Laser treatment uses focused light to seal leaking blood vessels or treat areas of your retina that are not getting enough oxygen. For proliferative diabetic retinopathy, we may recommend scatter laser treatment, also called panretinal photocoagulation, which treats the outer parts of your retina to reduce abnormal vessel growth. For macular edema, focal or grid laser may be used in select cases, often as an adjunct rather than first-line for center-involving swelling.
Laser can work well in combination with injections or may be used alone in certain cases. The treatment is performed in our office and usually takes 20 to 40 minutes per session.
When anti-VEGF injections do not fully control your macular swelling, we may consider a steroid injection instead. Steroid implants can reduce swelling for several months, but they carry a higher risk of raising your eye pressure and causing cataracts to develop faster.
We typically reserve steroid treatments for patients who have not responded well to anti-VEGF therapy or who cannot come in frequently enough for regular anti-VEGF injections. Close monitoring for side effects is essential if you receive steroid treatment.
If you have severe bleeding inside your eye that does not clear on its own, scar tissue pulling on your retina, or retinal detachment, you may need vitrectomy surgery. During this procedure, a retinal surgeon removes the blood and gel from inside your eye and repairs any retinal damage.
Vitrectomy is more involved than injections and requires recovery time, but it can save vision in advanced cases that do not respond to other treatments. Our eye doctor will refer you to a retinal surgeon if we believe surgery is your best option.
No eye treatment can fully succeed if your blood sugar and blood pressure remain poorly controlled. Work closely with your primary care doctor or endocrinologist to reach an individualized A1C target (often around 7 percent for many adults, but not right for everyone) and keep your blood pressure in a healthy range.
- Better diabetes control can slow or stop diabetic eye disease progression
- Lowering your blood pressure reduces stress on retinal blood vessels
- Managing cholesterol levels protects your overall eye health
- These systemic improvements work together with eye treatments for the best results
If your diabetes treatment is intensified quickly, your eye doctor may monitor you more closely during that period.
Protecting Your Vision Between Eye Doctor Visits
Keeping your blood sugar levels as steady as possible protects your retina from further damage. Check your blood sugar according to your diabetes care plan, and keep a record to share with your medical team.
Sudden swings in blood sugar can temporarily blur your vision even when your diabetic eye disease is stable. If you notice vision changes, check whether your blood sugar is too high or too low before you panic about your eye condition.
An Amsler grid is a simple chart with a pattern of straight lines that you can use at home to check for vision changes. Look at the grid with one eye at a time, and note whether the lines appear straight or if any areas look wavy, blurry, or missing.
We can give you an Amsler grid to keep at home and show you how to use it properly. Checking it once a week helps you catch new problems early so you can contact us before significant damage occurs. This only checks central vision and does not replace regular dilated exams or imaging for diabetic retinopathy.
Eating a balanced diet rich in vegetables, whole grains, lean proteins, and healthy fats helps keep your blood sugar stable and supports your overall health. Foods high in antioxidants like leafy greens and colorful vegetables may offer additional benefits for your retina.
- Regular physical activity helps your body use insulin more effectively
- Exercise improves blood flow throughout your body, including your eyes
- Maintaining a healthy weight reduces your diabetes complications risk
- Avoiding smoking is one of the most important things you can do for your vision
Even when your vision feels fine, you need regular eye exams to monitor your diabetic eye disease. We can detect changes on your retina before you notice any symptoms, which allows us to adjust your treatment before you lose vision.
If you are receiving injections, we will see you as often as every four to eight weeks. If your disease is stable without treatment, you still need a comprehensive dilated eye exam at least once a year, and possibly more often depending on your risk factors.
Frequently Asked Questions
You should not stop injections on your own even if your vision has improved significantly. We will monitor your retina with OCT scans and exams to determine when it is safe to extend the time between treatments or pause them altogether, but stopping too soon usually allows the swelling and leaking to return.
If you have diabetic eye disease in one eye, there is a higher chance you will develop it in the other eye as well, since diabetes affects your entire body. However, each eye can progress at a different rate, and some people only ever need treatment in one eye while the other remains stable with monitoring.
Most patients describe the sensation as pressure rather than pain because we use numbing drops that make your eye comfortable before the injection. You may feel a brief pinch or sting, but the actual injection lasts only a second or two, and many people are surprised by how tolerable it is.
Most insurance plans, including Medicare, cover medically necessary eye injections for diabetic macular edema and proliferative diabetic retinopathy because they are proven treatments that reduce the risk of severe vision loss. Our office can verify your specific coverage and let you know what your out-of-pocket costs will be before you start treatment.
Laser treatment plays an important role in managing diabetic retinopathy, but for diabetic macular edema affecting your central vision, injections are generally more effective at reducing swelling and improving visual acuity. We often use laser and injections together for the best outcomes, with each treatment addressing different aspects of the disease. For proliferative diabetic retinopathy, injections can be effective but require reliable follow-up, while panretinal photocoagulation can be more durable when follow-up reliability is a concern.
The duration of treatment varies widely from person to person and depends on how well you control your diabetes, how your eyes respond to therapy, and whether your disease remains active or becomes quiet. Some patients need treatment for a few years, while others require ongoing management for life to preserve their vision.
Getting Help for Diabetic Eye Disease
If you have diabetes and have not had a dilated eye exam in the past year, schedule one soon to protect your vision. Early detection and treatment of diabetic eye disease can prevent most vision loss, and our eye doctor is here to partner with you in preserving your sight for years to come.