Diabetic Retinopathy: Protecting Your Eyes From Diabetes' Silent Damage

Diabetic retinopathy is one of the leading causes of preventable blindness — and it often has no symptoms until significant damage has already occurred.

How Diabetes Damages the Retina

Consistently high blood sugar levels damage the tiny blood vessels that nourish the retina. Over time, these vessels can leak fluid or blood, become blocked, or trigger the growth of abnormal new vessels that bleed easily — all of which threaten central and peripheral vision.

Stages of Diabetic Retinopathy

1. Mild non-proliferative – small areas of balloon-like swelling in retinal blood vessels.
2. Moderate/Severe non-proliferative – more blood vessels become blocked, depriving areas of the retina of blood supply.
3. Proliferative diabetic retinopathy (PDR) – the retina grows new, fragile blood vessels that can bleed into the eye and cause scar tissue, risking retinal detachment.

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Illustration of diabetic retinopathy affecting the retina (Wikimedia Commons, CC BY 3.0)

Why Regular Screening Matters

Diabetic retinopathy typically causes no symptoms in its early stages — by the time blurred vision, dark spots, or vision loss appear, damage may already be advanced. This is why anyone with diabetes should have a dilated eye exam at least once a year, regardless of how their vision feels.

Treatment Options

• Blood sugar and blood pressure control – the single most important factor in slowing progression.
• Anti-VEGF injections – medication injected into the eye to reduce swelling and abnormal vessel growth.
• Laser photocoagulation – seals leaking vessels or shrinks abnormal new ones.
• Vitrectomy – surgery to remove blood or scar tissue in advanced cases with bleeding or retinal detachment.

Living Well With Diabetes and Protecting Your Vision

Keeping HbA1c, blood pressure, and cholesterol within target ranges dramatically reduces your risk. Combined with annual eye screening, most vision loss from diabetic retinopathy is preventable — catching it early gives treatment the best chance to work.