Diabetic retinopathy is an eye complication that can affect people living with diabetes, in which the blood vessels in the retina become damaged. In people with diabetes, several factors can affect these blood vessels.
One of these is chronic hyperglycemia, persistently elevated blood glucose levels, which occurs especially in people with poorly controlled diabetes. Excess glucose in the blood can cause inflammation, oxidative stress, and changes in the function of the cells lining the blood vessels, which can also damage the vessel walls.
Additionally, excess glucose can directly damage the blood vessels in the retina, making them more prone to leaking fluid or blood. This fragility can also lead to the abnormal formation of new blood vessels.
Similarly, since diabetes can trigger neovascularization, the process by which these abnormal blood vessels form, it can also lead to chronic inflammation.
All of this, combined with diabetes itself, can negatively affect blood circulation in the retina and contribute to the development of diabetic retinopathy.
Types of Diabetic Retinopathy
Generally, diabetic retinopathy is an eye complication caused by diabetes damaging the blood vessels in the retina.
The retina is the thin, light-sensitive layer at the back of the eye, playing a crucial role in vision by capturing light and converting it into electrical signals that travel to the brain via the optic nerve.
When diabetes damages the retina’s blood vessels, it can lead to anything from mild vision problems to complete blindness (amaurosis) if not properly managed.
Diabetic retinopathy is mainly classified into two types:
- Non-proliferative diabetic retinopathy: an early stage of the condition in which the retina’s blood vessels begin to leak blood or other fluid, causing the retina to swell. This stage usually shows no noticeable symptoms.
- Proliferative diabetic retinopathy: the advanced stage of the disease, in which damaged blood vessels can become blocked, triggering the formation of new, abnormal blood vessels. This neovascularization results in fragile vessels prone to bleeding, leading to vision problems.
Symptoms of Diabetic Retinopathy
In its early, non-proliferative stage, diabetic retinopathy is asymptomatic, making this the ideal time for eye exams to catch it early.
Once the condition progresses to the proliferative stage, symptoms can include:
- Blurred vision: the most common symptom of diabetic retinopathy, ranging from mild to severe, caused by retinal swelling or macular edema, fluid buildup in the center of the retina.
- Floaters: some people with diabetic retinopathy may notice dark spots or floaters in their field of vision, often caused by bleeding in the retina from abnormal blood vessels.
- Vision changes: someone with diabetic retinopathy may experience irregular or distorted vision, caused by traction on the retina from neovascularization.
- Vision loss: in advanced stages, diabetic retinopathy can cause significant, irreversible vision loss, and may also lead to retinal detachment.
While these are the most common symptoms, not everyone developing diabetic retinopathy will experience them, and when they do appear, it usually means the disease has already reached an advanced stage.
How Can Diabetic Retinopathy Be Slowed Down?
Successfully slowing the progression of diabetic retinopathy depends on several factors, including the person’s overall health, when it was diagnosed, and when treatment began.
Treatment options include:
- Blood sugar control: properly managing blood glucose levels is essential for both preventing and controlling diabetic retinopathy.
- Cholesterol and blood pressure control: keeping cholesterol and blood pressure at healthy levels is equally important, since both can worsen the condition.
- Intraocular injections: when fluid has accumulated in the retina, specific medications can be injected directly into the eye to help reduce swelling and improve the patient’s vision.
- Photocoagulation: a laser procedure used to seal or destroy abnormal blood vessels in the retina.
- Vitrectomy: for severe cases of diabetic retinopathy, especially when there’s retinal detachment or bleeding, this surgical procedure removes fluid and abnormal tissue to restore or preserve vision.
- Intravitreal medications: these medications, injected into the affected eye, aim to treat aspects of diabetic retinopathy such as abnormal blood vessel growth or macular edema.
Diabetic retinopathy can be reversible, depending on the extent of blood vessel damage, the patient’s overall health, how well their diabetes is managed, and, of course, how early the condition was diagnosed.
Are Diabetic Retinopathy and Macular Edema the Same Thing?
It’s common to wonder whether diabetic retinopathy and macular edema are the same condition; they’re actually two different conditions, though closely related, and both can arise as complications of diabetes.
As mentioned, diabetic retinopathy is caused by damage to the retina’s blood vessels from poorly managed diabetes.
Diabetic macular edema, on the other hand, is a complication of diabetic retinopathy itself, which can cause fluid to build up in the macula, leading to blurred vision.
Regardless of which condition is present, both are related to vision problems stemming from poorly managed diabetes. To help prevent this, anyone diagnosed with diabetes should receive regular eye care to avoid developing diabetic retinopathy or, if already present, seek timely treatment to prevent its progression.
At the Conde de Valenciana ABC Institute of Ophthalmology, part of ABC Medical Center, we can provide you with specialized care and help you get checked early if you’re at risk for diabetic retinopathy. Contact us!
