Diabetic Eye Exams: Why a Yearly Dilated Exam Matters

Published October 1, 2026 · By Dr. Lu Eye Care · 5 min read · Eye health

If you have diabetes, your eyes need a specific kind of attention. Diabetes can damage the tiny blood vessels of the retina for years before you notice anything wrong with your vision. A regular dilated eye exam is the most reliable way to catch these changes early, when treatment works best. Here is what you need to know.

How diabetes affects the eyes

High blood sugar over time can weaken and damage small blood vessels throughout the body, including those in the retina, the light-sensitive tissue at the back of the eye. The main eye conditions linked to diabetes are:

• Diabetic retinopathy. In the early, non-proliferative stage, damaged vessels leak fluid or small amounts of blood. In the advanced, proliferative stage, the retina grows fragile new vessels that can bleed into the eye or cause scar tissue that pulls on the retina.
• Diabetic macular edema. Fluid leaks into the macula, the part of the retina responsible for sharp central vision, causing blurring. It can occur at any stage of retinopathy.
• Cataracts. People with diabetes tend to develop cataracts at a younger age.
• Glaucoma. Diabetes is associated with a higher risk of glaucoma. Learn about screening in glaucoma testing explained.

Diabetic retinopathy is a leading cause of vision loss in working-age adults in the United States, which is why screening matters so much.

Why symptoms come late

Early diabetic retinopathy usually causes no symptoms at all. Vision can remain 20/20 even while changes are developing in the retina. By the time you notice blurring, floaters or dark spots, the disease may be more advanced. Sudden new floaters in someone with diabetes can be a sign of bleeding inside the eye and need prompt attention; see eye floaters and flashes. Blood sugar swings can also cause temporary blurry vision by changing the shape of the eye's lens, which is another reason to tell your eye doctor about your diabetes control.

How often you need a diabetic eye exam

The American Diabetes Association's Standards of Care recommend:

• Type 2 diabetes: a dilated, comprehensive eye exam by an optometrist or ophthalmologist at the time of diagnosis, because type 2 diabetes may have been present for years before it was found.
• Type 1 diabetes: an initial dilated exam within five years after diagnosis.
• After that: generally every year. If one or more annual exams show no retinopathy and blood sugar is in the target range, your eye doctor may consider exams every one to two years.
• If any retinopathy is present: dilated exams at least yearly, and more often if it is progressing or threatens vision.
• Pregnancy: people with type 1 or type 2 diabetes who are planning a pregnancy or become pregnant should have an eye exam before pregnancy or in the first trimester, with monitoring during pregnancy as their doctor advises.

Your eye doctor will recommend the schedule that fits your results. For other groups, see how often you should get an eye exam.

What happens during a diabetic eye exam

1. History. Your eye doctor asks about your type of diabetes, how long you have had it, your recent A1C if you know it, blood pressure, medications and any vision changes.
2. Vision and eye pressure. Standard tests check your visual acuity and eye pressure.
3. Dilation. Drops widen your pupils so the doctor can see the entire retina, including the periphery.
4. Retinal examination. The doctor looks for tiny bulges in blood vessels, bleeding, leaking fluid, new abnormal vessels and swelling in the macula.
5. Imaging. Retinal photographs document what is seen, and an OCT scan can measure retinal thickness to detect macular edema that is not visible on a standard exam.
6. Communication. Many eye doctors send a report to your primary care doctor or endocrinologist, so your whole care team knows your eye status.

Some primary care offices offer retinal photo screening in the clinic. This can be a convenient check, but any abnormal or unclear result should be followed by a full exam with an eye doctor.

Treatment works best when started early

When diabetic eye disease is found, treatments can slow or stop vision loss. Options include injections of medications into the eye to reduce leakage and abnormal vessel growth, laser treatment, and surgery for advanced bleeding or scar tissue. Results are best when treatment begins before significant damage has occurred, which is the whole point of regular screening.

Protecting your eyes every day

• Work with your health care team to keep blood sugar in your target range.
• Manage blood pressure and cholesterol, which also affect retinal blood vessels.
• Do not smoke, or get help to quit.
• Stay active and follow your treatment plan.
• Keep every scheduled eye exam, even when your vision seems fine.
• Report any sudden change in vision promptly.

Insurance and cost

Because a diabetic eye exam evaluates a medical condition, it is often billed to medical insurance rather than a routine vision plan. Coverage varies, so ask the office how the visit will be billed when you book. Out-of-pocket costs are generally eligible for HSA or FSA funds; see using your HSA or FSA for eye care.

Questions to ask at your diabetic eye exam

• Do I have any signs of diabetic retinopathy or macular edema?
• If so, what stage is it, and is it stable compared with my last exam?
• When should I come back, and should anything prompt me to call sooner?
• Will you send a report to my primary care doctor or endocrinologist?
• Do I have any other findings, such as early cataracts or high eye pressure?

Write down the answers, or ask for a copy of the report for your own records. If you ever change eye doctors, these results give your new doctor a valuable baseline; see how to request your eye care records.

Bottom line

Diabetes can harm your eyes quietly, but regular dilated exams catch problems early, when they are most treatable. Book your exam at diagnosis, keep to the schedule your eye doctor recommends, and share your results with your diabetes care team.

This article is general health information and is not a substitute for an examination or personal advice from a licensed eye care professional. If you have sudden vision changes, eye pain, or new floaters or flashes, seek care promptly.