Understanding Diabetic Retinopathy

Nonproliferative diabetic retinopathy, or NPDR, is the earliest stage of the disease. At this stage, blood vessel damage is present, but new, abnormal vessels have not yet started to grow. NPDR is classified by its severity:

• Mild NPDR: A few microaneurysms, the tiny bulges in vessel walls, are present. Your vision is usually completely unaffected at this stage, and you may not need any treatment yet, but your eye doctor will want to monitor you closely.
• Moderate NPDR: More microaneurysms and small hemorrhages appear throughout the retina, and some blood vessels may become blocked. You might start to notice mild blurriness or slight changes in your vision.
• Severe NPDR: This stage is marked by widespread hemorrhages, significant blockage of retinal blood vessels, and a high risk of advancing to the proliferative stage within the next year if left untreated. Many patients still have relatively good vision, which is why regular monitoring is so important.

Proliferative diabetic retinopathy, or PDR, is the most advanced and dangerous stage. It is defined by neovascularization, the growth of new, fragile, abnormal blood vessels on the surface of the retina or into the vitreous, the clear gel that fills the inside of your eye. These vessels can lead to severe, vision-threatening complications:

• Vitreous Hemorrhage: The fragile new vessels bleed into the vitreous, causing a sudden cloud of floaters, dark spots, or even complete vision loss in that eye. The blood blocks light from reaching the retina.
• Tractional Retinal Detachment: Scar tissue forms along with the abnormal vessels. As this scar tissue contracts and tightens over time, it can pull the retina away from the back wall of the eye, causing severe and permanent vision loss if not treated promptly.
• Neovascular Glaucoma: Abnormal blood vessels can grow on the iris, the colored part of your eye, and into the drainage channels that regulate eye pressure. This blocks the normal flow of fluid out of the eye, causing a painful and sudden spike in pressure that can damage the optic nerve.

Diabetic macular edema, often called DME, is a serious complication that can develop at any stage of diabetic retinopathy, though it becomes more common as the disease progresses. DME occurs when damaged blood vessels leak fluid directly into the macula, the small central area of the retina that gives you the sharp, detailed vision you need for reading, driving, and recognizing faces. This swelling causes blurry, wavy, or distorted central vision and is one of the leading causes of vision loss in people with diabetes.

Every person with diabetes should have a comprehensive dilated eye exam at least once a year, even if your vision seems perfect. If you have type 1 diabetes, you should have your first eye exam within five years of your diagnosis. If you have type 2 diabetes, you should have an eye exam as soon as you are diagnosed, since many people have had diabetes for some time before it is detected. You should see an eye specialist sooner than your annual exam if you notice any changes in your vision, if your primary care doctor or endocrinologist detects signs of poorly controlled blood sugar, if you are pregnant, or if you have other risk factors like high blood pressure or a long duration of diabetes.

Not necessarily. While diabetes is one of the leading causes of vision loss and blindness in adults, the vast majority of diabetes-related vision loss is preventable with proper care. With early detection through regular eye exams, strict control of your blood sugar and blood pressure, healthy lifestyle choices, and timely treatment when needed, most patients with diabetes can preserve clear, functional vision throughout their lives. The key is staying proactive and not waiting until you notice problems with your vision, because by then, some damage may have already occurred.

In the very earliest stages, such as mild nonproliferative retinopathy with only a few microaneurysms, significant improvements in blood sugar control can sometimes lead to partial reversal of the damage, and the condition may stabilize or even improve slightly. However, once retinopathy has progressed to moderate or advanced stages, the structural damage to the blood vessels and retinal tissue cannot be completely reversed. That said, treatment can often stabilize the condition, slow or stop its progression, reduce swelling, and in many cases prevent further vision loss or even improve vision that has been affected by macular edema or bleeding.

While diabetic retinopathy often develops slowly without symptoms in its early stages, certain sudden changes in your vision are urgent warning signs that require immediate medical attention. Contact ReFocus Eye Health Cheshire right away if you experience any of the following:

• A sudden increase in floaters, which may look like spots, cobwebs, or dark strings drifting in your vision
• Flashes of light in one or both eyes
• Sudden blurry vision or a sudden loss of vision, even if it is partial or temporary
• A dark curtain, shadow, or veil moving across your field of vision from any direction

Several factors increase your risk of developing diabetic retinopathy or experiencing faster progression of the disease. The longer you have had diabetes, the higher your risk becomes, which is why duration of diabetes is one of the strongest risk factors. Poor blood sugar control, reflected in high HbA1c levels, significantly increases risk. High blood pressure and high cholesterol also contribute to faster progression. Pregnancy can sometimes trigger rapid worsening of retinopathy, so pregnant women with diabetes need more frequent eye exams. Smoking doubles your risk of developing diabetes complications, including eye disease. Certain ethnic and racial groups, including African American, Hispanic, and Native American populations, are at higher risk and should be especially vigilant about regular eye exams.