Diabetic Retinopathy

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Diabetic retinopathy is a complication of diabetes that affects the blood vessels of the retina. Over time, high blood sugar levels can damage these small blood vessels, causing them to leak, close off, or grow abnormally. Diabetic retinopathy is one of the leading causes of vision loss in working-age adults, but early detection and treatment can often prevent or limit vision loss.

 

What Causes Diabetic Retinopathy?

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Diabetic retinopathy develops as a result of long-term diabetes, including both type 1 and type 2 diabetes. Persistently elevated blood sugar damages retinal blood vessels, leading to reduced oxygen supply and abnormal vessel growth.

Risk factors include:

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• Duration of diabetes (risk increases over time)
   

• Poor blood sugar control
   

• High blood pressure
   

• High cholesterol
   

• Kidney disease
   

• Pregnancy
   

• Smoking
   

 

Stages of Diabetic Retinopathy

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Diabetic retinopathy typically progresses through stages:

 

Nonproliferative Diabetic Retinopathy (NPDR)

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• Early stage
   

• Retinal blood vessels weaken and leak fluid or blood
   

• May cause retinal swelling, especially in the macula (diabetic macular edema)

 

Proliferative Diabetic Retinopathy (PDR)

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• Advanced stage
   

• New, abnormal blood vessels grow on the retina or into the vitreous
   

• These vessels are fragile and prone to bleeding, increasing the risk of vitreous hemorrhage and retinal detachment
   

 

Symptoms

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In the early stages, diabetic retinopathy may cause no noticeable symptoms. As the disease progresses, symptoms may include:

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• Blurred or fluctuating vision
   

• Dark spots or floaters
   

• Difficulty reading or seeing fine details
   

• Sudden vision loss (often due to bleeding)
   

Regular eye exams are essential because significant damage can occur before symptoms appear.

 

How Diabetic Retinopathy Is Diagnosed

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Diagnosis is made through a comprehensive dilated eye examination. Additional testing may include:

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• Optical Coherence Tomography (OCT) to evaluate retinal swelling
   

• Fluorescein angiography to assess blood vessel leakage and circulation
   

• Retinal photography for documentation and monitoring
   

 

Treatment Options

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Treatment depends on the stage of disease and presence of macular edema.

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Medical Management

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• Tight control of blood sugar, blood pressure, and cholesterol is critical
   

• Coordination with the patient’s primary care physician or endocrinologist is essential
   

Injections

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• Anti-VEGF injections are commonly used to treat diabetic macular edema and proliferative disease
   

• Steroid injections or implants may be used in select cases
   

Laser Treatment

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• Focal or grid laser for macular edema in certain situations
   

• Panretinal photocoagulation (PRP) for proliferative diabetic retinopathy to reduce abnormal vessel growth
   

Surgery

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• Vitrectomy may be required for:

  • Persistent vitreous hemorrhage
     

  • Tractional retinal detachment
     

  • Advanced disease unresponsive to other treatment
     

Prognosis

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With regular monitoring and modern treatments, many patients with diabetic retinopathy can maintain useful vision. Early detection and timely treatment significantly reduce the risk of severe vision loss.

 

Living With Diabetic Retinopathy

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Patients can help protect their vision by:

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• Keeping blood sugar levels under control
   

• Managing blood pressure and cholesterol
   

• Attending regular eye exams — even when vision seems normal
   

• Reporting any sudden vision changes promptly
   

 

When to Seek Immediate Care

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Contact an eye care professional right away if you experience:

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• Sudden vision loss
   

• New floaters or flashes
   

• Blurred or distorted vision that worsens quickly
   

These symptoms may indicate bleeding or retinal detachment requiring urgent treatment.