Diabetic macular edema, often shortened to DME, happens when damaged retinal blood vessels leak fluid into the macula, the part of the retina used for sharp central vision.
Quick summary
DME can cause blurry or wavy central vision, but diabetes-related eye disease may also be silent early on. A dilated eye exam is an important safety step.
Key takeaways
- DME is linked to diabetic retinopathy.
- Symptoms can include blurry central vision, wavy lines, dark areas, or trouble reading.
- Treatment may include eye injections, laser treatment, steroids, monitoring, or surgery in selected complications depending on the eye findings.
- Blood sugar, blood pressure, cholesterol, and smoking status matter for eye risk.
What to watch for
- New blurry or distorted central vision.
- Trouble reading, driving, or recognizing faces.
- Dark spots or central blur.
- Vision changes during pregnancy if you already have diabetes.
- Any sudden or severe change in sight.
Emergency warning signs
Flashes, many new floaters, or a curtain-like shadow are not typical DME symptoms. They can point to a retinal tear or detachment and need urgent eye care.
How it is checked
An eye doctor may use a dilated exam and imaging such as optical coherence tomography to look for swelling and retinal changes. Screening helps find treatable disease early, but timing, treatment choice, and follow-up also matter for preventing permanent vision loss.
Treatment decisions depend on whether the macula is involved, how much vision is affected, the stage of retinopathy, and whether follow-up can be done safely. Do not assume that every person with DME needs the same treatment schedule.
Practical takeaway
DME is treatable for many people, but timing matters. New vision symptoms deserve prompt eye care, and routine dilated exams help find disease before symptoms appear.
Safety note
This article is not a substitute for medical care. Seek urgent eye care for sudden vision loss, flashes, many new floaters, a curtain over vision, eye pain, or symptoms that feel unsafe.
What to ask your care team
- Do I have macular swelling or only retinopathy?
- How often should my eyes be checked?
- What symptoms should make me call the eye clinic urgently?
Related reading
Source summary
- Diabetic Retinopathy, National Eye Institute. Eye health information. Accessed June 5, 2026. Source
- Diabetic Eye Disease, National Institute of Diabetes and Digestive and Kidney Diseases. Patient guidance. Accessed June 5, 2026. Source
- Vision Loss and Diabetes, Centers for Disease Control and Prevention. Patient guidance. Accessed June 5, 2026. Source
- Injections to Treat Eye Conditions, National Eye Institute. Patient guidance. Accessed June 5, 2026. Source