Diabetic Retinopathy: Symptoms, Causes & Eye Care in Diabetes
Updated: Oct 7
Could diabetes affect your eyesight even when your vision seems perfectly normal? Yes. Diabetes can gradually damage the small blood vessels that supply the retina, the light-sensitive tissue at the back of the eye. This condition is known as diabetic retinopathy and can eventually lead to serious vision problems if it is not detected and managed in time.
How Does High Blood Sugar Damage the Eyes?
What happens inside the eye when blood sugar remains high for a long time?
Persistently elevated blood sugar can damage the tiny blood vessels in the retina. These vessels may weaken, swell or leak fluid and blood. As the condition progresses, the retina may develop abnormal new blood vessels that are fragile and can bleed easily.
The risk generally increases the longer a person has diabetes, particularly when blood sugar, blood pressure or cholesterol levels are not well controlled.
Can Diabetic Retinopathy Have No Symptoms?
Why can diabetic eye disease go unnoticed?
One of the biggest concerns with diabetic retinopathy is that it may not cause noticeable symptoms during its early stages. A person may continue with everyday activities without realising that changes are taking place inside the eye.
As the condition progresses, symptoms may include:
Blurred vision
Dark spots or floating shapes
Difficulty seeing colours
Dark or empty areas in the field of vision
Difficulty reading or doing detailed work
Partial or severe vision loss
Sudden changes in vision should be evaluated promptly.
What Are the Different Stages of Diabetic Retinopathy?
Does diabetic retinopathy always become severe?
No. The condition can range from an earlier stage called nonproliferative diabetic retinopathy (NPDR) to a more advanced stage called proliferative diabetic retinopathy (PDR).
In NPDR, weakened retinal blood vessels may leak and cause swelling, including macular edema. In PDR, abnormal new blood vessels develop and may bleed into the eye or contribute to retinal detachment.
Can Diabetes Cause Other Eye Problems?
Is diabetic retinopathy the only eye complication linked to diabetes?
No. People with diabetes may also have a higher risk of conditions such as cataracts and glaucoma. High blood sugar can contribute to changes in the eye's lens, while diabetes is associated with an increased risk of certain types of glaucoma.
This is why diabetes management should include attention to overall eye health, not just blood sugar readings.
How Can Diabetic Retinopathy Be Detected Early?
Can an eye examination find diabetic retinopathy before symptoms appear?
Yes. Regular comprehensive eye examinations are an important part of diabetes care. During an examination, an eye specialist can dilate the pupils and examine the retina and its blood vessels for signs of damage.
Early detection is particularly important because treatment can be more effective before significant vision loss occurs.
How Can You Protect Your Eyes If You Have Diabetes?
What can you do to reduce the risk of diabetic eye complications?
Good diabetes management can help protect your vision. Important steps include:
Keeping blood sugar within your recommended range
Monitoring HbA1c as advised
Managing blood pressure and cholesterol
Taking diabetes medicines as prescribed
Avoiding tobacco
Getting regular eye examinations
Reporting sudden changes in vision without delay
Managing diabetes is not only about controlling blood sugar today. It is also about reducing the risk of complications that can affect your eyes, nerves, kidneys and other organs.
When Should You See a Doctor?
If you have diabetes and notice blurred vision, new floaters, flashes, blind spots, distortion or sudden changes in eyesight, seek medical advice promptly. Even without symptoms, regular eye checks are important because diabetic retinopathy can develop silently.
If you are living with diabetes and need guidance on blood sugar control and preventing diabetes-related complications, book an appointment with Dr. Bhaskaracharya Kalita, MBBS, MD (Internal Medicine), at The Gastro Life, Guwahati for personalised medical care.
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