What Is Diabetic Retinopathy? Symptoms and Risk Factors
Diabetic retinopathy often gives no warning. A person can see clearly, read the fine print, and drive at night while damage builds inside the eye. By the time vision changes show up, the disease may already be advanced. That quiet start is the most important thing to understand about this condition.
At St. George Eye Center, we examine patients with diabetes every week. This guide explains what diabetic retinopathy is, who faces the highest risk, which symptoms to watch for, and how doctors find it early. It is meant to educate, not to diagnose. Only an eye exam can tell you what is happening in your eyes.
How Diabetic Retinopathy Affects the Retina
Diabetic retinopathy is damage to the blood vessels in the retina. The retina is the thin layer of tissue at the back of the eye that senses light and sends signals to the brain. It depends on a steady supply of blood through very small vessels.
Over time, high blood sugar can weaken and injure these vessels. Some leak fluid or blood into the retina. Others close off and cut the blood supply to parts of the retina. The condition affects people with type 1 and type 2 diabetes.
The Two Main Stages
Doctors describe diabetic retinopathy in two broad stages.
Non-proliferative diabetic retinopathy. This is the earlier stage. Small vessels leak, and tiny bulges called microaneurysms form in the vessel walls. Many people at this stage have no symptoms at all. The condition can range from mild to severe.
Proliferative diabetic retinopathy. This is the advanced stage. The retina lacks oxygen, so the eye grows new, fragile blood vessels. These vessels bleed easily and can cause scar tissue, bleeding inside the eye, and retinal detachment. Vision loss is a real risk at this stage.
Fluid can also collect in the macula, the center of the retina that handles sharp vision. This is called diabetic macular edema. It can occur at any stage and is a leading cause of vision loss in people with diabetes.
Key takeaway: Diabetic retinopathy begins with small vessel damage that rarely causes symptoms, and it can progress to serious vision threats if no one catches it.
Why Early Symptoms Are So Easy to Miss
The retina has no pain receptors. Early damage does not hurt, and it often does not change how you see. The brain also fills in small gaps, so a person may not notice a minor blind spot.
This is why many patients feel surprised by a diagnosis. They say their vision seemed fine. That is common, and it does not mean the problem is minor. Regular exams matter because they find changes before you can feel them.
Symptoms That May Appear Later
As the disease advances, some people notice changes. These can include:
Blurry or fluctuating vision, sometimes better one day and worse the next
New floaters, which look like dark spots, threads, or cobwebs
Dark or empty areas in the field of vision
Colors that look faded or washed out
Trouble seeing at night
Difficulty reading or recognizing faces
Any of these symptoms deserves a prompt evaluation. A symptom does not confirm diabetic retinopathy, since many eye conditions cause similar changes. It does signal that your eyes need a closer look.
Symptoms That Need Same-Day Care
Certain changes point to a possible emergency. Seek care the same day if you notice:
A sudden shower of new floaters
A dark curtain or shadow across part of your vision
Sudden, major vision loss in one eye
New flashes of light
These signs can mean bleeding inside the eye or a retinal detachment. Prompt treatment often protects remaining sight. St. George Eye Center offers walk-in urgent eye care with no appointment needed.
Risk Factors for Diabetic Retinopathy
Anyone with diabetes can develop diabetic retinopathy. Several factors raise the odds or speed up the damage.
Longer time with diabetes. The risk grows with each year of living with the condition.
Poorly controlled blood sugar. Sustained high glucose levels injure the retinal vessels.
High blood pressure. Extra pressure stresses already fragile vessels.
High cholesterol. Blood fat levels may worsen leakage in the retina.
Pregnancy. Hormonal and circulation changes can speed up existing retinopathy.
Smoking. Tobacco harms blood vessels throughout the body, including the eye.
Kidney disease. Damage in the kidneys and retina often occurs together.
Having risk factors does not guarantee the disease. Good control of blood sugar, blood pressure, and cholesterol lowers the chance of problems and slows progression for many people.
Why People With Diabetes Need More Frequent Eye Exams
A routine eye exam every few years works for many healthy adults. Diabetes changes that schedule. Retinopathy can develop and advance without symptoms, so doctors look for it on a set timetable.
Many guidelines recommend a dilated eye exam at least once a year for people with diabetes. The first exam usually happens soon after a type 2 diabetes diagnosis. People with type 1 diabetes typically begin exams within several years of diagnosis. Women with diabetes who become pregnant often need an exam early in pregnancy and closer follow-up afterward.
Your doctor may adjust this schedule based on your results. Someone with no signs of retinopathy and stable health may need fewer visits. Someone with changes in the retina may need exams every few months.
How Diabetic Retinopathy Is Diagnosed
Diagnosis starts with a comprehensive eye exam. The doctor uses drops to widen your pupils, which allows a clear view of the retina and optic nerve. Several tools can add detail.
Dilated retinal exam. The doctor looks for leaking vessels, bleeding, swelling, and abnormal new vessels.
Retinal photography. Detailed images create a record that the doctor can compare over time.
Optical coherence tomography. This scan produces cross-section images of the retina and shows swelling in the macula.
Fluorescein angiography. A dye travels through the blood vessels, and special photos reveal leaks or blocked vessels.
These tests are painless or nearly so. The drops may blur your vision and increase light sensitivity for a few hours, so bring sunglasses.
What Happens After a Diagnosis
Treatment depends on the stage. Early cases often need only close monitoring and better control of blood sugar, blood pressure, and cholesterol. More advanced cases may call for injections that reduce leakage and swelling, laser treatment, or surgery. These treatments aim to protect the vision you have. They do not always restore vision already lost, which is why early detection carries so much weight.
Schedule Your Dilated Eye Exam
If you have diabetes and have not had a dilated eye exam in the past year, now is a good time to book one. Our team can check your retinas and explain what the results mean for you. You can browse our full list of services to see how we support patients with diabetes and other eye conditions.
Visit St. George Eye Center to learn more about our practice and to schedule your visit.
