Diabetic retinopathy is progressive damage to the tiny blood vessels of the retina caused by years of elevated blood sugar, and the U.S. Centers for Disease Control and Prevention (CDC) calls it the leading cause of blindness in working-age adults. The dangerous part is that it is silent: in its early stages it causes no pain, no blurring, and no warning sign at all, which means it cannot be detected by how your eyes feel — only by a dilated eye exam. The good news is the single most valuable number in this article: the U.S. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) states that finding and treating diabetic retinopathy early can reduce the risk of blindness by up to 95%. That makes one annual appointment the highest-return action in your entire diabetes file.
In this guide from Bakery 8 in Riyadh, Saudi Arabia, we explain exactly what happens inside the eye, why the eye is the last organ to complain, why improving your blood sugar too quickly can temporarily make retinopathy worse (a paradox almost nobody warns patients about), and what actually protects your retina. This is educational content and does not replace your doctor's advice.
What exactly is diabetic retinopathy?
The retina is the thin, light-sensitive layer lining the back of the eye — the tissue that converts light into the nerve signals your brain reads. It is fed by an extremely dense network of microscopic capillaries. When blood sugar stays high for years, the walls of those capillaries are damaged: they become weaker and leakier, and some close off entirely, starving part of the retina of oxygen.
StatPearls, published through the U.S. National Library of Medicine, describes several overlapping mechanisms: the polyol pathway causing osmotic cell damage, oxidative stress, activation of protein kinase C which increases vascular permeability, and advanced glycation end-products (AGEs) that alter the tissue around the vessels. The end result is the same — vessels that leak fluid and blood, and tissue starved of oxygen.
The two stages: non-proliferative and proliferative
Mayo Clinic divides the disease into two main types:
- Non-proliferative diabetic retinopathy (NPDR) — the more common and earlier form. No new vessels grow, but existing vessel walls weaken and form tiny bulges called microaneurysms. These are the earliest visible sign on examination and appear as small round red dots, followed later by haemorrhages and areas of leakage.
- Proliferative diabetic retinopathy (PDR) — the severe form. The oxygen-starved retina responds by growing new, fragile, abnormal blood vessels. These bleed easily into the vitreous and can pull on the retina, causing retinal detachment.
Diabetic macular edema: the most common cause of vision loss
The macula is the centre of the retina responsible for detailed vision: reading, recognising faces, driving. When leaking vessels flood this specific area, it swells — this is diabetic macular edema (DME). The U.S. National Eye Institute (NEI) reports that about 1 in 15 people with diabetes develops it, and the CDC notes that about half of people with diabetic retinopathy will develop macular edema, making it the most common cause of blindness in this group.
The practical point: your central vision can be under threat while the rest of the retina is relatively intact — which is exactly why "I see fine" is not reassurance.
Why don't you feel anything at first?
This is the heart of the problem and deserves to be said plainly: the retina does not hurt. It has no pain nerve endings like the surface of the eye, and there is no biological early-warning system. NIDDK puts it bluntly: "Often there are no early symptoms of diabetic eye disease. You may have no pain and no change in your vision as damage begins to grow inside your eyes." NEI states that early stages "usually don't have any symptoms."
Two further factors make denial easy:
- One eye covers for the other. If damage starts in a single eye, the other compensates so completely that you may notice nothing at all unless you deliberately cover one eye and compare.
- The decline is extremely slow. The brain adapts gradually to vision that fades over years, so everything feels "normal" — and many people attribute what they do notice to ageing or to needing new glasses.
There is painful local evidence for this. A Saudi study published in Clinical Ophthalmology examined 338 patients who arrived at a tertiary eye hospital already in advanced proliferative diabetic retinopathy with no prior ocular intervention. Their visual acuity at presentation was roughly 20/200 and 20/300 — severe vision loss had already occurred. Critically: only 27% had been having routine annual retinal screening, and only 42.6% knew that annual screening mattered, even though 65.7% had heard of diabetic retinopathy. Nearly a third had never been referred for screening by their healthcare provider at all, and 30.5% waited more than three months after noticing symptoms before seeking eye care.
In short: symptoms are not an alarm system. The annual appointment is the alarm system.
How big is the problem in our region?
Global averages alone are not enough, because our region is not the global average. In the largest systematic review and meta-analysis on the subject, published by Teo and colleagues in Ophthalmology in 2021 and covering 59 population-based studies from 27 countries and 40,857 individuals with diabetes:
- Global prevalence of diabetic retinopathy: 22.27% — about 103.12 million adults in 2020, projected to reach 160.50 million by 2045.
- Global vision-threatening diabetic retinopathy: 6.17% — 28.54 million in 2020.
- Global clinically significant macular edema: 4.07%.
- In the Middle East and North Africa region the figures are clearly higher: 32.90% for diabetic retinopathy, 8.19% for vision-threatening disease, and 6.06% for clinically significant macular edema.
That means roughly one in three people with diabetes in our region has some degree of retinopathy. At the Saudi level, a systematic review published in Cureus in 2023 covering 12 studies found reported prevalence ranging from 6.25% to 88.1% — a wide spread explained by differing samples and diagnostic methods — but the associated factors were consistent: longer diabetes duration, older age, poor blood pressure control, poor glycemic control, and physical inactivity.
The number worth remembering
A Saudi study published in the Saudi Medical Journal in 2021 examined 428 patients with type 2 diabetes (mean age 61, mean disease duration 13 years), split by glycemic control:
- HbA1c of 9% or above: retinopathy prevalence 88.1%, macular edema 15.8%.
- HbA1c of 7% or below: retinopathy prevalence 22.1%, macular edema 4.9%.
- Overall prevalence in the sample: 37.6%.
This is a cross-sectional study, so it shows a strong association rather than proven causation, and differences in disease duration may explain part of the gap. But the distance between 88.1% and 22.1% turns "control your blood sugar" from an abstract target on a lab report into something concrete: it is being measured inside your eye.
When should I have my eyes checked?
NIDDK, NEI, the CDC and Mayo Clinic agree on the schedule:
- Type 1 diabetes: a dilated eye exam every year, starting within 5 years of diagnosis.
- Type 2 diabetes: a dilated eye exam right at diagnosis, then annually. The reason is that type 2 often goes undiagnosed for years, so retinopathy may have started before you even knew you had diabetes.
- Pregnancy: women with type 1 or type 2 diabetes need an exam before pregnancy or within the first three months, with possible repeat exams during pregnancy and for up to a year after delivery. (Gestational diabetes alone does not usually require this protocol — ask your doctor.)
- Already diagnosed with retinopathy: NEI notes that exams may be needed every 2 to 4 months depending on severity.
Note the word "dilated" — a routine optician's sight test for a spectacle prescription does not detect diabetic retinopathy.
What happens during a dilated eye exam?
- The doctor puts in drops to widen the pupil; they take about 15–30 minutes to work.
- The back of the eye is examined with a specialised instrument, often with retinal photography, and sometimes optical coherence tomography (OCT) to measure macular thickness and swelling.
- Vision stays blurry and light-sensitive for several hours afterwards.
Practical tips: book a morning slot, bring sunglasses, arrange for someone else to drive you home, and ask for a copy of the report and your retinopathy grade so you can compare it next year.
Can artificial intelligence close the access gap?
This matters, because the Saudi late-presentation study exposed real systemic barriers: 42.2% had difficulty accessing eye care services, 57.1% faced appointment delays exceeding six months, and 45.1% had no local retina service available.
In a pivotal trial published in npj Digital Medicine in 2018 involving 900 participants across 10 primary care sites, an autonomous AI system analysing retinal images achieved 87.2% sensitivity and 90.7% specificity for detecting more-than-mild diabetic retinopathy, with a 96.1% imageability rate. It became the first autonomous AI diagnostic system authorised by the U.S. Food and Drug Administration in any field of medicine. The practical meaning: initial imaging can happen in the diabetes clinic itself without waiting for an ophthalmology appointment. This is a screening tool, not a replacement for the doctor — a positive result triggers referral, a negative one means you come back next year.
The paradox nobody warns you about: improving blood sugar too fast
This is the most important section in the article, and the one most easily misread — please read it in full.
In the landmark DCCT trial — the reference trial in type 1 diabetes — researchers analysed what they called "early worsening" and published it in Archives of Ophthalmology in 1998. Among 1,439 participants, early worsening of retinopathy grade was seen at the 6- and/or 12-month visits in 13.1% of those assigned to intensive treatment versus 7.6% of those assigned to conventional treatment. The two strongest predictors were a higher HbA1c at screening and the magnitude of its drop during the first six months.
But here is the decisive part: roughly half of those who experienced early worsening had recovered by 18 months, and — more importantly — long-term outcomes in intensively treated patients who had early worsening were similar to or better than outcomes in conventionally treated patients who never experienced it. The authors concluded explicitly that the long-term benefits of intensive treatment greatly outweigh the risk of early worsening, while recommending eye monitoring before and after intensifying therapy, and considering a delay in intensification in cases of advanced retinopathy until photocoagulation is complete.
The practical takeaway in plain language: if your HbA1c is very high and you intend to fix it — through a major dietary change, a new medication, or starting insulin — that is the right decision and you should not abandon it. But the smarter path is to:
- Get a dilated eye exam before or at the start of intensification, so you have a documented baseline.
- Agree with your doctor on a gradual, planned descent rather than a very sharp drop over a few weeks.
- Repeat the eye exam during that first year of improvement as your doctor advises, particularly if you already have known retinopathy.
Never read this section as "so I should leave my blood sugar high to protect my eyes." The opposite is true, as the next section makes clear.
What actually protects your retina?
1) Long-term blood sugar control — and the benefit lasts
According to NIDDK's summary of the DCCT, which enrolled 1,441 volunteers between 1983 and 1993, intensive treatment lowered the risk of developing diabetic eye disease by 76% and slowed its progression by about 54% (it also reduced kidney disease by 50% and nerve disease by 60%).
The most striking finding came from the long-term EDIC follow-up: even though blood sugar levels converged between the two groups about five years after the trial ended, the intensively treated group stayed ahead — 49% less advanced eye disease at 18 years, 33% less advanced kidney disease at 24 years, and a 33% lower risk of death 21 years after the DCCT finished. This is called "metabolic memory," and its encouraging meaning is that every year you control your blood sugar buys protection that lasts decades. Its urgent meaning is that delay is expensive.
2) Blood pressure and lipids
Mayo Clinic lists high blood pressure and high cholesterol as independent risk factors for retinopathy, and both NIDDK and the CDC recommend managing the trio: HbA1c, blood pressure, and cholesterol. Your eye file is not your sugar file alone.
3) Smoking
Quitting smoking is an explicit recommendation from NIDDK, the CDC and Mayo Clinic for protecting the retina's fine vessels.
4) Physical activity
Mayo Clinic recommends 150 minutes or more of physical activity per week as part of diabetes management, and physical inactivity emerged as an associated factor in the Saudi systematic review published in Cureus.
What if diagnosis comes late? Treatment exists — but it preserves more than it restores
The treatments available today, per NEI, NIDDK and StatPearls, include:
- Anti-VEGF injections into the eye: first-line for centre-involving macular edema; they slow progression and can improve vision in some cases.
- Laser photocoagulation: focal laser to reduce leakage and swelling, and panretinal photocoagulation (PRP) for proliferative disease. In the classic Diabetic Retinopathy Study of 1,758 patients, photocoagulation reduced the two-year risk of blindness by about 60%.
- Vitrectomy: surgery for severe bleeding, scar traction, or retinal detachment.
But notice how all of these are framed: they aim to stop the loss and preserve what remains, not to rebuild a damaged retina. Retinal nerve cells do not regenerate. Which brings everything back to the number we opened with: early detection and treatment can reduce the risk of blindness by up to 95%, per NIDDK. The gap between that number and a 20/200 visual acuity at first presentation — as in the Saudi study — is nothing but appointments.
Warning signs that need urgent care (don't wait for the annual appointment)
See an eye doctor immediately if you notice any of the following, per Mayo Clinic, NEI and the CDC:
- A sudden shower of floaters or dark strings drifting across your vision.
- Repeated flashes of light.
- A curtain or dark shadow covering part of your field of vision.
- Sudden or rapid vision loss in one or both eyes.
- Straight lines appearing wavy or distorted (which can indicate macular edema).
- Severe eye pain with redness (which can indicate glaucoma).
Remember too that diabetes doubles the risk of open-angle glaucoma and brings cataracts on at a younger age, per the CDC and NIDDK — so the annual exam covers those as well.
Who should be extra careful, and when to consult your doctor
- Anyone diagnosed with diabetes many years ago — risk accumulates with time, and NEI notes that more than half of people with diabetes eventually develop retinopathy.
- Anyone whose HbA1c has been high for extended periods.
- Anyone with high blood pressure or a lipid disorder.
- Pregnant women with diabetes.
- Anyone with diabetic kidney disease or diabetic neuropathy — having one microvascular complication raises the likelihood of another.
- Smokers.
Always consult your doctor before changing medications or doses, before intensifying diabetes treatment, and before any drastic dietary change if you use insulin or medications that stimulate insulin release. This article is educational; it does not diagnose or treat.
A practical seven-step plan
- Book today. If it has been a year since your last dilated eye exam, your first step is a phone call, not a lifestyle change.
- Know your number. Ask for your most recent HbA1c and write it down. If it is 9% or above, you are in the group where the Saudi study found 88.1% prevalence.
- Plan a gradual descent. Agree with your doctor on a realistic timeline rather than a sharp drop, with an eye exam before intensification.
- Stabilise your blood pressure. Measure at home once a week, log it, and discuss the readings at your next visit.
- Self-check between appointments. Once a week: cover one eye and look at a door frame or a straight-edged tile, then swap. Any distortion or missing patch deserves a phone call. This never replaces the medical exam.
- Fix your daily starch base. Not by deprivation, but by reducing repeated sharp glucose spikes through a slower, lower-sugar starch base.
- Quit smoking if you smoke — it serves your retina, kidneys, nerves and heart at the same time.
Where does Bakery 8 fit into this?
Let's be completely honest: no bread protects your retina, and no food product replaces the annual dilated eye exam. The retina responds to your average blood sugar over years, plus your blood pressure and your lipids — not to a single meal or a single product.
The only thing we can honestly claim is one lever: a slower, lower-sugar daily starch base, because the repeated starch foundation — bread, toast, breakfast cereal, dessert — is a large share of many people's daily glycemic load. At Bakery 8 we make almond-flour, sugar-free, gluten-free alternatives for exactly that purpose:
- Bread and toast — almond-flour samoli and cloud bread as the daily sandwich base instead of repeated white bread.
- Keto granola — a direct swap for sweetened breakfast cereal, one of the highest-spiking meals for many people.
- Crackers and manakish — a savoury between-meals option instead of a fast sweet.
- Sugar-free chocolate, desserts and cake — so that "total abstinence" isn't the only plan, because plans nobody can tolerate don't last years, and the retina is measured in years.
If you want to understand your daily number more precisely, read our guide to continuous glucose monitoring and time in range, and our guide to prediabetes and how to reverse it. And if any product — ours first — doesn't suit you or doesn't give you the reading you expect on your meter, stop it.
Frequently asked questions
Can I have diabetic retinopathy while my vision is perfect?
Yes, and that is the most common situation in early disease. The U.S. National Eye Institute states that early stages usually cause no symptoms and that damage accumulates without pain. Having 20/20 vision does not rule out retinopathy, which is why detection relies on a dilated eye exam rather than on how well you think you see.
How often should I have my eyes examined?
At least once a year with a dilated eye exam: starting right at diagnosis for type 2 diabetes, and within five years of diagnosis for type 1. If you already have diagnosed retinopathy, your doctor may want an exam every two to four months. Pregnant women with diabetes need a separate, more frequent schedule.
Can diabetic retinopathy be reversed?
Treatment can halt progression and improve vision in some cases of macular edema, but structural retinal damage is not fully reversible and retinal nerve cells do not regenerate. That is why NIDDK states that early detection and treatment can reduce the risk of blindness by up to 95% — the entire value is in the timing.
I heard lowering blood sugar quickly can harm the eyes. Should I stop trying?
No. The DCCT found temporary early worsening in 13.1% of the intensive-treatment group versus 7.6% of the conventional group, but about half recovered within 18 months and long-term outcomes were better with control. The answer is a gradual descent coordinated with your doctor, plus an eye exam before intensification — not abandoning control.
Is a routine optician's sight test enough?
No. A spectacle prescription test does not examine the back of the eye and will not detect microaneurysms, haemorrhages, or macular edema. What you specifically need is a dilated fundus examination by an eye doctor, or an accredited retinal imaging programme that refers you when a result is positive.
Are there foods that treat diabetic retinopathy?
No food or supplement has been shown to treat diabetic retinopathy. What the evidence supports is long-term control of blood sugar, blood pressure and lipids, quitting smoking, physical activity, and regular screening. Any product promising to treat the retina or "clean" its vessels is making an unsupported claim.
Conclusion
Diabetic retinopathy does not knock on the door. No pain, no early blurring, no alarm. The only thing standing between you and a late diagnosis is one annual appointment that takes less than an hour. Bring your blood sugar down gradually and keep it there, manage your blood pressure and lipids, quit smoking, and get your retina checked every year — and you will have done very nearly everything you can.
At Bakery 8 we help with the small daily part of that equation: a tastier, slower, lower-sugar starch base that makes sticking with it for years a lot easier. Healthy and delicious.
References
- Teo ZL, et al. Global Prevalence of Diabetic Retinopathy and Projection of Burden through 2045: Systematic Review and Meta-analysis. Ophthalmology, 2021.
- National Eye Institute (NEI), National Institutes of Health. Diabetic Retinopathy.
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), NIH. Diabetic Eye Disease.
- Centers for Disease Control and Prevention (CDC). Diabetes and Vision Loss.
- World Health Organization (WHO). Blindness and Vision Impairment — Fact Sheet.
- Mayo Clinic. Diabetic Retinopathy — Symptoms and Causes.
- Shukla UV, Tripathy K. Diabetic Retinopathy. StatPearls, NCBI Bookshelf, National Library of Medicine.
- The Diabetes Control and Complications Trial Research Group. Early Worsening of Diabetic Retinopathy in the Diabetes Control and Complications Trial. Archives of Ophthalmology, 1998.
- NIDDK, NIH. Blood Glucose Control Studies for Type 1 Diabetes: DCCT and EDIC.
- Alahmadi AS, et al. Prevalence and Determinants of Diabetic Retinopathy Among Type 2 Diabetic Patients in Saudi Arabia: A Systematic Review. Cureus, 2023.
- Prevalence of Retinopathy and Associated Risk Factors Among High- and Low-Risk Patients with Type 2 Diabetes Mellitus. Saudi Medical Journal, 2021;42(6):693.
- Reasons for the Late Presentation of Diabetic Retinopathy in Saudi Arabia: A Survey of Patients Who Presented with Advanced Proliferative Diabetic Retinopathy to a Tertiary Eye Hospital. Clinical Ophthalmology, Dove Medical Press.
- Abràmoff MD, et al. Pivotal trial of an autonomous AI-based diagnostic system for detection of diabetic retinopathy in primary care offices. npj Digital Medicine, 2018.
- Pan-retinal photocoagulation and other forms of laser treatment for diabetic retinopathy: the landmark DRS and ETDRS trials. NIHR Health Technology Assessment, NCBI Bookshelf, National Library of Medicine.
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