EyeQAI

Diabetic Retinopathy

High blood sugar damages small blood vessels in the retina, causing bleeding and vision loss.

A way to think about it

Your retina is like a screen of tiny blood vessels that nourish light-sensitive cells. High blood sugar is like pouring salt on these delicate vessels—it weakens them, makes them leak, and causes tiny explosions (microaneurysms). Over time, the screen gets clogged and the light-sensitive cells starve for oxygen.

What's happening in the eye

Diabetes damages the small blood vessels in the retina over years of high blood sugar. First, tiny bulges form and leak (nonproliferative disease). The retina swells (edema), blurring vision. If untreated, new abnormal vessels sprout (proliferative disease) and bleed into the eye, causing sudden vision loss. Scar tissue can pull the retina off.

Common symptoms

  • Early: no symptoms, found on routine exam only
  • Floaters or spots that won't go away
  • Blurry or fluctuating vision, especially after high blood sugar
  • Difficulty reading or seeing fine detail
  • In advanced disease: sudden complete vision loss from bleeding

Risk factors

  • Duration of diabetes—risk rises after 10+ years with diabetes
  • Poor A1c control—high average blood sugar worsens disease
  • High blood pressure, especially systolic over 140
  • High cholesterol, especially LDL over 100
  • Pregnancy in diabetic women significantly accelerates disease
  • Smoking and kidney disease dramatically increase severity

Warning signs - seek care immediately

  • Sudden vision loss or new shower of floaters—could be bleeding, get urgent care today
  • Eye pain or pressure—could be neovascular glaucoma, don't delay
  • Straight lines look wavy—could signal severe macular swelling
  • Any sudden change in vision when you have diabetes—always get checked

Questions to ask your doctor

  • 1.Do I have nonproliferative or proliferative diabetic retinopathy? How severe?
  • 2.What is my A1c goal, and how does it affect my eye disease?
  • 3.Do I need anti-VEGF injections now, or can we monitor with imaging?
  • 4.How often do I need retina imaging (OCT)? Should I get it every visit?
  • 5.If I get tighter blood sugar control, could my retinopathy improve?

Diabetic retinopathy is preventable with good blood sugar control and caught early with regular eye exams. Modern injections preserve vision in most patients who are treated before advanced damage occurs.

Sources

Information on this page is based on the following authoritative sources:

Last updated: April 2026

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