Short answer: Most people with diabetes need a dilated eye exam at least once a year. Type 2 diabetes calls for a first exam at diagnosis, and in type 1 diabetes, an exam is required within five years of diagnosis. If your exams are clear and your blood sugar is steady, your doctor may stretch the gap to two years. Pregnancy and existing eye damage mean more frequent visits.
Diabetic eye disease is quiet. You can have damage at the back of your eye and still read the newspaper without a problem. That is why the calendar, not your symptoms, should decide when you go.
How often should you get a diabetic eye exam?
Diabetic patients should have a dilated retinal exam at least once yearly. This frequency may be increased depending on your eye disease.
When should you have your first exam?
It depends on the type of diabetes, because the two develop differently.
- Type 2 diabetes: The first examination should be at the time of diagnosis and yearly thereafter. Type 2 often goes unnoticed for years, so some people already have eye changes when they are told they have diabetes.
- Type 1 diabetes: within five years of diagnosis, then every year. Retinopathy is uncommon in the first few years of type 1, so the first exam can wait a little.
Why yearly exams matter even when your vision is fine
Early diabetic retinopathy usually has no symptoms. By the time blurry vision or floaters show up, damage may already be advanced. Studies have reported that more than half of people with diabetes will develop some form of diabetic retinopathy, and about 1 in 15 will develop diabetic macular oedema, swelling in the part of the retina that handles sharp central vision.
Treatment works best when it starts early. A dilated exam lets your eye doctor see the retina’s tiny blood vessels directly and catch leaks or swelling before they threaten your sight. It is painless, though light sensitivity can last a few hours.
Do you need more frequent exams?
Yes, in a few situations.
Pregnancy: Pregnancy can speed up retinopathy in women who already have diabetes. An exam before conception and another early in the first trimester, then follow-up based on what the doctor finds. Gestational diabetes is different: women who develop it do not typically need eye exams during pregnancy and are not at higher risk of retinopathy because of it.
Existing retinopathy: Once damage is found, the schedule tightens. People with retinopathy may need follow-up every 2 to 6 months, depending on severity.
Poor glucose or blood pressure control: Higher blood sugar and blood pressure raise the risk of damage. If your readings have been running high, ask your doctor whether annual is still frequent enough.
What does the exam involve?
A diabetic eye exam is more than the reading chart. Expect these steps:
- A vision check with your usual glasses or contacts.
- Dilating drops, then a look at the retina and optic nerve.
- Possibly retinal photographs or an OCT scan, which maps retinal thickness and picks up swelling.
- A conversation about your recent blood sugar control.
Bring your glasses and your medicine list, and arrange a ride home if glare bothers you.
Warning signs that should not wait for your next appointment
See an eye doctor the same day if you notice:
- sudden dark spots or cobweb-like streaks in your vision
- a curtain or shadow across part of your sight
- a sudden drop in vision in one or both eyes
- new floaters or flashes of light
Dark spots or cobweb-like streaks can signal bleeding in the retina and that treatment should start right away to avoid permanent scarring.
Frequently asked questions
How often should a type 2 diabetic have an eye exam?
At diagnosis, then at least once a year. If several exams show no damage and your blood sugar is well controlled, your doctor may move you to every one to two years.
How often should a type 1 diabetic have an eye exam?
Within five years of diagnosis, then yearly. Your eye doctor may lengthen the interval later if your exams stay clear.
Can I just get new glasses instead of a dilated exam?
No. A glasses check measures how well you see. It does not examine the retina. Diabetic damage can sit behind perfect vision.
Does gestational diabetes require extra eye exams?
Generally no. Women with gestational diabetes do not typically need eye exams during pregnancy and do not have increased retinopathy risk from it. Women with type 1 or type 2 diabetes who become pregnant do.
This article is general information, not medical advice. Your eye doctor and diabetes care team can set the right schedule for you.