Diabetic Eye Disease: What Every Diabetic Patient Needs to Know

How Diabetes Affects the Eyes

High blood sugar damages blood vessels throughout the body — including the tiny, fragile vessels that supply the retina at the back of your eye. This damage is called diabetic retinopathy, and it's the leading cause of new blindness among working-age adults in the United States.

In the early stages, damaged vessels may leak fluid or blood into the retina. As the disease progresses, the retina may signal for new — but abnormal — blood vessel growth. These new vessels are weak and prone to rupture, which can cause severe vision loss or retinal detachment.

Other Diabetic Eye Conditions

Retinopathy is the most serious, but diabetes is also associated with an increased risk of:

• Diabetic macular edema — fluid buildup in the macula, the part of the retina responsible for central vision
• Cataracts — diabetic patients develop cataracts earlier and more rapidly
• Glaucoma — elevated risk due to vascular changes in the optic nerve

The Critical Importance of Early Detection

Diabetic retinopathy has no symptoms in its early stages. Vision typically remains normal until the disease is significantly advanced — at which point treatment options become more limited. This is precisely why annual dilated eye exams are not optional for diabetic patients. They are a medical necessity.

At Harnos Optometry, we use advanced retinal imaging technology to document and monitor changes to the retina over time. Even subtle changes from year to year can guide treatment decisions before vision is affected.

What You Can Do

Control your blood sugar. The Diabetes Control and Complications Trial demonstrated clearly that tight glycemic control dramatically reduces the risk and progression of retinopathy. Every percentage point reduction in HbA1c matters.

Control blood pressure and cholesterol. Vascular health is intimately tied to retinal health. High blood pressure accelerates retinal damage in diabetic eyes.

Don't skip your annual eye exam. Even if your vision seems perfect, the retina can be changing. We recommend that all diabetic patients — Type 1 and Type 2 — have a comprehensive dilated exam annually at minimum.

We Coordinate With Your Medical Team

If we find signs of diabetic retinopathy or other diabetes-related eye changes, we communicate directly with your primary care physician or endocrinologist. Managing diabetic eye disease is a team effort, and we take our role in that seriously.