What Is Diabetic Retinopathy?

Diabetic retinopathy is an eye disease that occurs when diabetes damages the tiny blood vessels that supply the retina, which is the light-sensitive tissue at the back of your eye. The retina works like the film in a camera, capturing light and sending visual signals to your brain so you can see. When these blood vessels become damaged, they can leak fluid or bleed, and new, abnormal blood vessels may grow. Over time, this damage can blur your vision or cause permanent blindness.

This condition can develop in anyone who has diabetes, whether it’s type 1 diabetes (where the body doesn’t produce insulin), type 2 diabetes (where the body doesn’t use insulin properly), or even gestational diabetes (a type of diabetes that can develop during pregnancy). The longer someone lives with diabetes, especially if blood sugar levels aren’t well controlled, the higher their risk of developing diabetic retinopathy becomes.^[1]

Understanding How Common This Condition Is

Diabetic retinopathy is surprisingly common and represents one of the most frequent complications of diabetes worldwide. According to available data, approximately 103 million people across the globe are affected by this condition.^[12] It stands as the leading cause of blindness among working-age adults, affecting both people with type 1 and type 2 diabetes in similar numbers.^[6]

Over time, more than half of all people living with diabetes will develop some form of diabetic retinopathy during their lifetime.^[2] This statistic underscores the importance of regular eye examinations for anyone diagnosed with diabetes. In the United States alone, among adults over age 40 who have diabetes, one-third have retinopathy.^[14] The prevalence increases with the duration of diabetes, meaning those who have lived with the condition for many years face particularly elevated risk.

What Causes Diabetic Retinopathy?

The root cause of diabetic retinopathy lies in prolonged exposure to high blood sugar levels. When you have diabetes, excess glucose circulates in your bloodstream. Over time, this elevated sugar damages the inner walls of the small blood vessels throughout your body, including those in your eyes. The retina, which requires a constant and healthy blood supply to function properly, becomes particularly vulnerable to this damage.^[1]

As blood sugar damages these delicate vessels, they begin to leak fluid and blood into the surrounding retinal tissue. Your body attempts to repair this damage by closing off the damaged vessels, but this creates areas where blood flow is reduced or blocked entirely. In response, your eye tries to compensate by growing new blood vessels to restore blood supply to these undersupplied areas.^[3]

Unfortunately, these new blood vessels don’t work properly. They are fragile and tend to leak blood and fluid into the vitreous, the clear, gel-like substance that fills the center of your eye. These abnormal vessels can also grow on the surface of your retina, and over time, they may stick to the vitreous gel. When this happens, the gel can pull on the retina, potentially causing it to detach from the back of the eye, which can lead to blindness.^[3]

Recent research has identified that a specific type of harmful fat molecule called ceramide accumulates in the eyes of patients with diabetic retinopathy. After being triggered by inflammatory signals, these ceramides cluster together into large formations that send damaging signals to cells in the eye, causing cell death and disease progression.^[14]

Who Is at Risk for Developing Diabetic Retinopathy?

Anyone with any form of diabetes is at risk for developing diabetic retinopathy. However, certain factors can significantly increase your chances of developing this condition. The most important risk factor is how long you’ve had diabetes. The longer diabetes has been present in your body, the more time high blood sugar has had to damage your retinal blood vessels.^[2]

Poor blood sugar control dramatically increases risk. If your diabetes is difficult to manage or if your blood glucose levels remain consistently high, the damage to your blood vessels accelerates. This is why healthcare providers emphasize the importance of keeping blood sugar levels as close to target ranges as possible.^[3]

Recognizing the Symptoms

One of the most concerning aspects of diabetic retinopathy is that it often develops silently. In the early stages, you may have no symptoms at all. Your vision might seem completely normal even while damage is occurring in your retina. This is why the condition is often discovered only during routine diabetic eye screening appointments, before you notice any problems yourself.^[5]

Some people do notice early changes in their vision, such as difficulty reading or trouble seeing objects that are far away. These changes might come and go, which can make them easy to dismiss. However, if you experience these symptoms, it’s important to have your eyes examined.^[2]

As the disease progresses to later stages, symptoms become more noticeable and concerning. You might see dark spots or strings floating in your vision, commonly called floaters, or streaks that look like cobwebs. These occur when blood vessels bleed into the vitreous fluid of your eye. Your vision may become blurred or distorted, and you might notice dark or empty areas in your field of vision. Some people develop difficulty seeing at night or in low light conditions, a problem called night blindness. Colors may appear faded or less vivid than before.^[3]

Sometimes these spots or floaters clear up on their own, but this doesn’t mean the problem has resolved. It’s crucial to seek treatment immediately if you notice these symptoms, as without intervention, bleeding can worsen or recur, scars can form in the back of your eye, and vision loss can progress to blindness.^[2]

How to Prevent or Delay Diabetic Retinopathy

While not everyone with diabetes will develop diabetic retinopathy, there are several powerful steps you can take to reduce your risk or slow the progression of the disease. The most effective strategy is managing your diabetes well through careful control of your blood sugar levels. This involves monitoring your blood glucose regularly, taking all prescribed medications as directed, and working closely with your diabetes care team.^[2]

Lifestyle choices play a crucial role in prevention. Eating a healthy, balanced diet helps stabilize blood sugar levels throughout the day. Focus on consuming healthy carbohydrates like fruits, vegetables, whole grains, and legumes such as beans, peas, and lentils. Include foods rich in dietary fiber, which helps your body digest other foods more slowly and control blood sugar spikes. Choose lean proteins like poultry and fish, especially fatty fish rich in omega-3 fatty acids such as salmon, tuna, and sardines, which support overall eye health. Incorporate foods with healthy fats like avocados, nuts, and olive oil while limiting foods with added sugars, saturated fats, or trans fats.^[20]

Staying physically active is equally important. Regular exercise has been shown to delay the onset and progression of diabetic retinopathy by reducing inflammation and protecting the retina. People with diabetes should aim for at least 150 minutes per week of moderate-intensity physical activity, such as swimming, walking briskly, or bicycling. However, always consult your doctor before starting any new exercise routine.^[18]

Managing your blood pressure is critical, as high blood pressure exacerbates damage to retinal blood vessels. Similarly, keeping cholesterol levels in a healthy range through diet, exercise, and medication if needed helps protect your eye health. Quitting smoking, maintaining a healthy weight, and reducing stress are additional lifestyle changes that positively impact both your overall health and your vision.^[17]

Perhaps most importantly, attend regular comprehensive eye examinations. If you have diabetes and are aged 12 or older, you should be invited for diabetic eye screening every one to two years. These screenings involve taking photographs of the back of your eye to detect early signs of retinopathy before symptoms appear. Early detection dramatically improves treatment outcomes and can prevent vision loss. Even if your vision seems fine, don’t skip these appointments.^[5]

Understanding What Happens Inside Your Eye

To understand diabetic retinopathy, it helps to know what’s happening inside your eye at a physical level. The condition develops in stages, with changes becoming progressively more serious over time. The disease affects your retina through a series of interconnected processes involving inflammation, oxidative stress (damage from harmful molecules), and problems with the nervous system in your eye.^[12]

In the earliest stage, called nonproliferative diabetic retinopathy, the blood vessels in your retina become weakened. Tiny bulges called microaneurysms form in the vessel walls, and these can leak small amounts of fluid into the retina. Your body responds by trying to close off these damaged vessels. At this stage, you typically have no symptoms, and your vision remains unaffected. As more vessels become damaged, you may move into a moderate stage where more vessels are blocked, depriving parts of your retina of adequate blood supply.^[7]

The advanced stage is called proliferative diabetic retinopathy. Here, widespread blood vessel damage means large areas of your retina aren’t receiving enough oxygen. Your eye responds by producing growth factors that trigger the formation of new blood vessels. These new vessels grow on the surface of the retina and into the vitreous gel. However, they are fragile and abnormal, with walls that leak easily. When they bleed into the vitreous, your vision becomes cloudy or blocked.^[7]

Another serious complication that can occur at any stage is diabetic macular edema. This happens when fluid leaks into the macula, the central part of your retina responsible for sharp, detailed vision needed for tasks like reading and recognizing faces. The macula swells, causing blurred vision. About one in 15 people with diabetes will develop this condition over time.^[2]

As the disease progresses, scar tissue can form in the back of your eye. This scar tissue can contract and pull on your retina, causing it to detach from the back of your eye in a condition called tractional retinal detachment. Additionally, if abnormal blood vessels grow into the front part of your eye where fluid normally drains out, they can block this drainage system, causing pressure to build up inside your eye. This leads to a type of glaucoma that can damage your optic nerve and cause further vision loss.^[2]

Diabetes also increases your risk of developing other eye conditions. People with diabetes are two to five times more likely to develop cataracts (clouding of the eye’s lens) and tend to get them at younger ages. Diabetes also nearly doubles the risk of developing open-angle glaucoma, another sight-threatening condition.^[2]

Living With Diabetic Retinopathy

Receiving a diagnosis of diabetic retinopathy can feel overwhelming, but many people successfully manage this condition and preserve their vision. Education is empowering. Learning about the symptoms, progression, and treatment options helps you make informed decisions and take effective action. Studies show that patient education effectively motivates people to implement self-management behaviors such as following their diet and taking medications as prescribed, which forms the foundation for preventing disease progression.^[16]

Managing your blood sugar remains the single most important thing you can do. Maintaining stable blood glucose levels through a healthy diet, regular exercise, and medication compliance can slow or even halt the progression of diabetic retinopathy. This gives you a sense of control and allows you to actively participate in protecting your vision.^[16]

Finding emotional support is equally important. Living with diabetic retinopathy can be emotionally challenging, and it’s natural to feel worried or frustrated. Look for support groups, either in person or online, for people with diabetic retinopathy or vision loss. Connecting with others who understand your experience can provide comfort and practical advice. Don’t hesitate to reach out to family, friends, or mental health professionals for additional support.^[17]

Practical coping strategies can also help. Some people find it helpful to explore educational resources, engage in problem-solving when challenges arise, and actively seek information and professional help when needed. Making changes to accommodate your current level of functioning, rather than withdrawing or avoiding activities, tends to improve functioning and decrease distress in the long term.^[16]