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Diabetic Retinopathy – Causes, Symptoms and Treatment

Diabetic retinopathy is an eye disease caused by diabetes that damages the retina and can lead to blindness if left untreated.

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Things worth knowing about "Diabetic Retinopathy"

Diabetic retinopathy is an eye disease caused by diabetes that damages the retina and can lead to blindness if left untreated.

What is Diabetic Retinopathy?

Diabetic retinopathy is one of the most common complications of diabetes mellitus and a leading cause of blindness in adults worldwide. It develops when persistently high blood sugar levels damage the small blood vessels in the retina -- the light-sensitive layer at the back of the eye that transmits visual signals to the brain. If these vessels are chronically damaged, vision gradually deteriorates and may be permanently lost.

Causes and Risk Factors

The primary cause of diabetic retinopathy is long-term poorly controlled blood sugar in people with type 1 diabetes or type 2 diabetes. Chronic elevated glucose levels damage the walls of the tiny blood vessels (capillaries) supplying the retina.

Duration of diabetes: The longer a person has diabetes, the greater the risk of developing retinopathy.
Poor blood sugar control: High HbA1c levels significantly increase the risk.
High blood pressure (hypertension): Increases pressure on vessel walls and accelerates damage.
High cholesterol: Elevated blood lipid levels contribute to vascular damage.
Smoking: Impairs circulation and increases risk.
Pregnancy: Can worsen pre-existing retinopathy.

Stages of the Disease

Diabetic retinopathy is classified into two main forms:

Non-Proliferative Diabetic Retinopathy (NPDR)

This is the early stage of the disease. The blood vessels in the retina become weakened, swell, and may leak. This leads to microaneurysms (small bulges in vessel walls), hemorrhages, and deposits called hard exudates. Many patients have no visual symptoms at this stage.

Proliferative Diabetic Retinopathy (PDR)

In the advanced stage, the retina grows new but fragile blood vessels (neovascularization). These vessels can rupture easily, causing bleeding into the vitreous humor. There is a high risk of severe vision loss or retinal detachment.

Diabetic Macular Edema

Diabetic macular edema (DME) is a frequent complication in which fluid accumulates in the macula -- the area responsible for sharp central vision -- causing blurred sight. It can occur at any stage of the disease.

Symptoms

In the early stages, diabetic retinopathy often causes no symptoms. As the condition progresses, the following symptoms may appear:

Blurred or hazy vision
Dark spots or shadows in the visual field
Color vision disturbances
Sudden vision loss
Flashes of light or floaters (small moving shapes in the visual field)

Because the disease is often asymptomatic for a long time, regular eye examinations are especially important for people with diabetes.

Diagnosis

Diagnosis is made by an ophthalmologist using several examination methods:

Fundoscopy (dilated eye exam): The doctor examines the retina using a special light after dilating the pupils.
Fluorescein angiography: A contrast dye is injected to visualize blood vessel changes.
Optical Coherence Tomography (OCT): An imaging technique that provides detailed cross-sections of the retinal layers, especially useful for detecting macular edema.
Fundus photography: Photographic documentation of the retina to monitor disease progression.

People with diabetes are recommended to have an annual eye examination by an ophthalmologist.

Treatment

Treatment depends on the severity of the disease and aims to prevent further deterioration.

General Measures

Optimal blood sugar control (HbA1c target as advised by a physician)
Management of high blood pressure and elevated blood lipids
Smoking cessation

Laser Treatment (Photocoagulation)

Laser photocoagulation is a well-established treatment for proliferative retinopathy. Targeted laser spots are used to seal leaking vessels and inhibit the growth of new abnormal blood vessels.

Intravitreal Injections (IVOM)

For diabetic macular edema or proliferative retinopathy, medications are often injected directly into the vitreous humor of the eye. These include:

Anti-VEGF agents (e.g., ranibizumab, aflibercept, bevacizumab): Inhibit the growth of abnormal blood vessels.
Corticosteroids (e.g., dexamethasone implant): Reduce inflammation and swelling.

Vitrectomy

In cases of severe vitreous hemorrhage or retinal detachment, a surgical procedure called a vitrectomy may be necessary, in which the vitreous humor is removed and replaced.

Prevention

The best prevention is consistent diabetes management. Key strategies include:

Regular blood sugar monitoring and adherence to therapy targets
Healthy diet and regular physical activity
Blood pressure management
Annual eye examinations with an ophthalmologist
Avoiding smoking

References

World Health Organization (WHO) - Global Report on Diabetes (2016). Available at: www.who.int
Cheung N, Mitchell P, Wong TY - Diabetic retinopathy. Lancet. 2010;376(9735):124-136. PubMed PMID: 20580421
American Diabetes Association - Standards of Medical Care in Diabetes (2024). Available at: www.diabetesjournals.org

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