Diabetes can have serious, often silent effects on vision, making early detection and ongoing care essential. In this in-depth discussion on diabetes-related eye disease, Michael Engelbert, MD, PhD, a vitreoretinal surgeon and macular disease specialist, explains how diabetes affects the eyes, what warning signs patients should know, and how modern treatments and imaging technologies are helping preserve sight.
Dr. Engelbert provides medical care for age-related macular degeneration and diabetic eye disease, as well as surgical management of macular disease and retinal detachment repair, including complex detachments related to diabetes, trauma, or failed primary repair. He also specializes in secondary intraocular lens implantation following complicated cataract surgery. An internationally renowned expert on vitreous anatomy and vitreoretinal interface disorders, he frequently lectures on these topics both in the United States and abroad.
How does diabetes affect the eyes, and what are the most common complications you see?
Diabetes affects the eyes by damaging small blood vessels, particularly in the retina. Over time, high blood sugar can cause these vessels to leak, swell, or close off. The most common complications I see include diabetic retinopathy, diabetic macular edema, cataracts, and glaucoma.
Can you explain diabetic retinopathy and how it develops?
Diabetic retinopathy occurs when high blood sugar damages the tiny blood vessels in the retina. Early on, vessels may weaken and leak fluid or blood. As the condition progresses, new abnormal blood vessels can grow, which are fragile and prone to bleeding. Without treatment, this can lead to significant vision loss.
When should people with diabetes start having regular eye exams, and how often?
Anyone diagnosed with diabetes should have a comprehensive dilated eye exam as soon as possible, even if their vision seems fine. After that, most patients should be examined at least once a year, though some may need more frequent visits depending on their eye health.
What early warning signs of eye problems should diabetic patients watch for?
Many diabetic eye conditions have no early symptoms, which is why routine exams are so important. When symptoms do occur, they may include blurry vision, floaters, dark spots, difficulty seeing at night, or sudden vision changes. Any new visual symptom should be evaluated promptly.
How does blood sugar control impact eye health?
Blood sugar control is one of the most important factors in protecting vision. Keeping glucose levels within a healthy range significantly reduces the risk of developing diabetic eye disease and slows progression if problems are already present.
Are there lifestyle habits that help prevent diabetes-related eye issues?
Yes. Managing blood sugar, blood pressure, and cholesterol is essential. Regular exercise, a balanced diet, not smoking, and taking medications as prescribed all play a major role in maintaining eye health and reducing complications.
What treatment options are available for diabetic eye diseases today?
We have very effective treatments available today, including injectable medications, laser therapy, and surgical procedures when necessary. When diabetic eye disease is detected early, these treatments can preserve vision and, in many cases, improve it.
How can new technologies, like retinal imaging, help detect problems early?
Advanced retinal imaging allows us to detect very subtle changes in the retina—often before patients notice symptoms. This technology helps us diagnose problems earlier, monitor progression more accurately, and start treatment at the right time.
Are some patients with diabetes at higher risk for eye complications than others?
Yes. Risk is higher for patients who have had diabetes for a long time, those with poor blood sugar control, high blood pressure, kidney disease, or during pregnancy. That’s why personalized care and regular monitoring are so important.
