Diabetic Eye Exams in San Francisco: How Often You Need One and What to Expect
If you have diabetes, the most dangerous thing about diabetic eye disease is how quiet it is. It does not hurt. It does not blur your vision at first. You can have the early stages of it right now, reading this, and feel completely normal.
The short answer: A diabetic eye exam is a dilated, comprehensive eye exam that checks the retina for damage caused by high blood sugar. The American Diabetes Association recommends that adults with type 2 diabetes get one at the time of diagnosis, and adults with type 1 diabetes get one 5 years after onset, with annual exams after that. An optometrist can perform this exam. It is billed as a medical visit rather than a routine vision visit, and it is the single most effective thing you can do to protect your sight.
This guide comes from Dr. Michelle Blas, OD at Eyes in Disguise Optometry on Union Street in Cow Hollow. Below is what the exam actually involves, how often you genuinely need one, and the warning signs that mean you should not wait for your next scheduled visit.
What Is a Diabetic Eye Exam?
A diabetic eye exam is a comprehensive dilated eye examination focused on finding diabetes-related damage to the retina, the light sensitive tissue at the back of the eye. It is more thorough than a vision screening at the DMV or a quick glasses check.
Diabetes damages the small blood vessels throughout your body, and the ones in your retina are among the smallest. When blood sugar stays high over time, those vessels weaken, leak fluid and blood, and eventually close off. The eye responds by growing fragile new vessels that bleed easily. This process is called diabetic retinopathy, and according to the American Diabetes Association it is the most frequent cause of new cases of blindness among adults aged 20 to 74 in high income countries.
The reason a dilated exam matters is simple. Dilating drops widen the pupil so your optometrist can see the entire retina, not just the small window visible through an undilated pupil. Early retinopathy shows up in the periphery long before it reaches the center of your vision, which is where you would finally notice it.
How Often Do You Need a Diabetic Eye Exam?
The schedule below follows the American Diabetes Association Standards of Care in Diabetes, 2026 edition, Section 12.
- Type 2 diabetes: First dilated and comprehensive eye exam at the time of diagnosis. Type 2 often goes undiagnosed for years, so retinopathy can already be present on day one.
- Type 1 diabetes: First dilated and comprehensive eye exam 5 years after onset, because retinopathy takes at least that long to develop after blood sugar first rises.
- After a clear exam: If one or more annual exams show no retinopathy and your glucose numbers are in your goal range, screening every 1 to 2 years may be considered.
- If any retinopathy is found: Dilated exams at least once a year, and more often if it is progressing.
- If it is advancing or threatening your sight: More frequent exams, with a referral to a retina specialist. Some people need to be seen every 2 to 4 months.
- Pregnancy: If you have preexisting type 1 or type 2 diabetes, you should have an eye exam before pregnancy and again in the first trimester, with monitoring each trimester and for up to a year after delivery depending on what is found.
One honest caveat about that 1 to 2 year option. It applies to people with consistently well managed blood sugar and repeated clean exams. If your A1C has been climbing, if you have high blood pressure or kidney involvement, or if you are starting or intensifying a medication, annual is the right answer. Rapid drops in A1C can temporarily worsen retinopathy, so your eye care should stay in step with changes to your treatment.
Why You Cannot Feel It Coming
This is the part worth sitting with. The National Eye Institute lists the early symptoms of diabetic retinopathy as none. Not mild. None.
The American Diabetes Association makes the same point clinically: people with vision threatening retinopathy may be asymptomatic. By the time you notice something, the disease has usually reached a stage that is harder to treat.
When symptoms finally do appear, they tend to look like this:
- Blurry vision that comes and goes
- Dark floating spots or streaks that look like cobwebs, which is bleeding into the eye
- Trouble reading or seeing objects far away
- A dark or empty area in the center of your vision
- Colors appearing faded or washed out
Over time, more than half of people with diabetes will develop some degree of diabetic retinopathy. The exam exists precisely because your own experience of your vision is not a reliable early warning system.
Can an Optometrist Do My Diabetic Eye Exam?
Yes. The American Diabetes Association guidelines specifically name "an ophthalmologist or optometrist" as the appropriate provider for the initial dilated and comprehensive eye examination, and for the annual exams that follow.
This trips people up, so it is worth being clear. Your primary care doctor or endocrinologist manages your diabetes. They do not perform the dilated retinal exam. They refer you out for it, and an optometrist is a correct destination for that referral. If retinopathy is found and needs treatment such as injections or laser, that is when a retina specialist takes over. Our role is to catch it, monitor it, and know exactly when to hand it off.
Ask that your results be sent back to the doctor managing your diabetes. That loop matters. Your retinal findings tell your care team something real about how your blood sugar is affecting your small blood vessels everywhere, not just in your eyes.
Do I Have to Get Dilated?
For a true diabetic eye exam, dilation is the standard, and it is what the guidelines call for. The drops take about 20 to 30 minutes to work, and your near vision stays blurry and light sensitive for a few hours afterward. Bring sunglasses. If you are heading back to a screen heavy workday, book a late afternoon appointment.
There is a nuance worth knowing. The American Diabetes Association does recognize retinal photography with remote reading, and FDA approved artificial intelligence screening, as appropriate screening strategies where they improve access. The important condition attached is that such programs must provide a pathway to a full comprehensive eye exam when something is found. Screening tells you whether to look closer. It does not replace the exam.
At our practice we use widefield retinal imaging and OCT, which produces a cross sectional scan of the retinal layers and can reveal swelling in the macula before it affects your vision. These images also create a permanent baseline, so next year's retina can be compared to this year's rather than to a memory. We use them alongside the dilated exam, not instead of it.
What Happens at Your Appointment
A diabetic eye exam at our Cow Hollow office includes:
- A review of your diabetes history, including your most recent A1C, how long you have had diabetes, and your current medications
- Visual acuity and refraction, since blood sugar swings can shift your prescription temporarily
- Intraocular pressure measurement to screen for glaucoma
- Dilation, then a detailed examination of the retina, macula, and optic nerve
- Widefield retinal imaging and OCT scanning to document and measure what we see
- A clear explanation of the findings and a plan, which we can share with your primary care doctor or endocrinologist on request
Two things to bring: your most recent A1C number if you know it, and sunglasses for the walk home. If you are unsure of your A1C, ask your primary care office to send it over before your visit.
Diabetes Affects More Than the Retina
Retinopathy gets the attention, but a diabetic eye exam is checking for several conditions at once. According to the National Eye Institute:
- Cataracts. Diabetes makes you 2 to 5 times more likely to develop cataracts, and more likely to get them at a younger age.
- Open angle glaucoma. Diabetes nearly doubles your risk.
- Diabetic macular edema. About 1 in 15 people with diabetes will develop it. Fluid leaks into the macula, the part of the retina responsible for sharp central vision, and blurs it.
- Fluctuating prescriptions. High blood sugar changes the shape of the lens inside your eye. This is why we ask about recent glucose control before finalizing a new prescription, so you do not buy glasses tuned to a temporary state.
Dry eye is also more common with diabetes, since nerve changes can reduce tear production and corneal sensitivity. If your eyes burn or water constantly, that is worth raising at the same visit rather than booking a separate one. Our dry eye treatment page covers what that evaluation involves.
When Not to Wait for Your Annual Exam
Call promptly, the same day if possible, if you have diabetes and notice any of the following:
- A sudden shower of new floaters or dark spots
- Flashes of light
- A curtain or shadow moving across your field of vision
- Sudden vision loss in one eye, even briefly
- Sudden blurring that does not clear
- Eye pain with redness
These can indicate a retinal bleed, a retinal detachment, or neovascular glaucoma, all of which are time sensitive. We reserve slots daily for urgent cases. See our emergency eye care page or call the office directly.
The Encouraging Part
Diabetic eye disease is one of the most preventable causes of serious vision loss, and that is not wishful framing. Intensive diabetes management has been shown in large randomized studies to prevent or delay the onset and progression of retinopathy and to reduce the need for future eye procedures. Blood pressure and cholesterol control help too.
Layer an annual dilated exam on top of good glucose control and you have a system that catches problems while they are still small and quiet. Treatment for early retinopathy is often just careful monitoring. Treatment for advanced retinopathy is injections, laser, or surgery. The exam is what decides which conversation you end up having.
Frequently Asked Questions
How often should a diabetic have an eye exam?
Adults with type 2 diabetes should have a dilated, comprehensive eye exam at the time of diagnosis, and adults with type 1 diabetes 5 years after onset, with exams at least annually after that. If one or more annual exams show no retinopathy and blood sugar is well managed, the American Diabetes Association says screening every 1 to 2 years may be considered. If any retinopathy is present, exams should be at least yearly, and more frequent if it is progressing.
Can an optometrist do a diabetic eye exam?
Yes. The American Diabetes Association Standards of Care specifically names an ophthalmologist or optometrist as the appropriate provider for the initial dilated and comprehensive eye examination and for follow up exams. If treatment such as injections or laser becomes necessary, the optometrist refers you to a retina specialist.
What is the difference between a diabetic eye exam and a regular eye exam?
A regular eye exam focuses on your prescription and general eye health. A diabetic eye exam is a dilated, comprehensive exam that specifically evaluates the retina, macula, and optic nerve for damage caused by diabetes, documents findings with retinal imaging, and can be shared with the doctor managing your diabetes. It is billed as a medical visit rather than a routine vision visit.
Does a diabetic eye exam hurt?
No. The exam is painless. Dilating drops sting slightly for a few seconds, and the bright examination light is briefly uncomfortable, but nothing about the exam is painful. The main inconvenience is a few hours of blurry near vision and light sensitivity afterward, which is why sunglasses help.
Do I need to get dilated for a diabetic eye exam?
Dilation is the standard for a diabetic eye exam, because early retinopathy appears in the peripheral retina that an undilated pupil hides. The American Diabetes Association does accept retinal photography with remote reading, and FDA approved AI screening, as appropriate screening strategies where they improve access, but those programs must provide a pathway to a full comprehensive eye exam when something is detected.
Is a diabetic eye exam covered by insurance?
A diabetic eye exam is generally billed to your medical insurance rather than your vision plan, because it evaluates a medical condition rather than your glasses prescription. Medicare Part B covers a yearly eye exam for diabetic retinopathy for people with diabetes, performed by an eye doctor licensed to do the test in your state. What you owe out of pocket depends on your plan, your deductible, and your coverage year, so we do not quote costs online. Call our office at (415) 474-5321 with your plan information and we will check your benefits before your visit.
Can diabetic retinopathy be reversed?
Early diabetic retinopathy can stabilize and in some cases improve when blood sugar, blood pressure, and cholesterol are brought under control. Advanced damage such as scarring and lost vision is generally not reversible, though treatments including injections and laser can stop progression and preserve remaining sight. This gap between early and advanced is the entire reason annual exams matter.
Where can I get a diabetic eye exam in San Francisco?
Eyes in Disguise Optometry provides dilated diabetic eye exams with widefield retinal imaging and OCT scanning at 2133 Union Street in Cow Hollow, serving patients from the Marina, Pacific Heights, Russian Hill, and throughout San Francisco. Call (415) 474-5321 or book an appointment online. Results can be shared with the doctor managing your diabetes on request.
Book Your Diabetic Eye Exam
If you have diabetes and cannot remember your last dilated eye exam, that is your answer about whether you are due. Our comprehensive eye care team handles diabetic eye exams alongside routine care, and you can read more about what to expect from our comprehensive eye exams.
Call (415) 474-5321 or book online. Same week appointments are often available.
This article is for general education and is not a substitute for an examination or medical advice. If you have diabetes, follow the eye care schedule your own doctors recommend for you.
Sources: American Diabetes Association, "12. Retinopathy, Neuropathy, and Foot Care: Standards of Care in Diabetes 2026," Diabetes Care, Volume 49, Supplement 1. National Eye Institute, "Diabetic Retinopathy," nei.nih.gov.
About the author: Dr. Michelle Blas, OD, is an optometrist at Eyes in Disguise Optometry in San Francisco's Cow Hollow neighborhood. A graduate of the SUNY College of Optometry and a member of the American Optometric Association, she specializes in primary and emergency eye care, dry eye treatment, diabetic eye disease, glaucoma management, and specialty contact lens fittings.
Eyes in Disguise Optometry, 2133 Union Street, San Francisco, CA 94123. (415) 474-5321.
