Diabetic Retinopathy: Causes and Treatment

Diabetic Retinopathy: Causes and Treatment

Diabetic retinopathy is one of the most common complications of diabetes. Approximately 20% of individuals with type 1 diabetes develop diabetic retinopathy within ten years of being diagnosed of diabetes, and this percentage increases with the duration of the disease. Furthermore, 20-30% of type 2 diabetes patients are affected by diabetic retinopathy at the time of their diabetes diagnosis.

The management of blood sugar levels plays a crucial role in reducing the risk of developing diabetic retinopathy. Additionally, it is considered the primary control for diabetic patients who are already suffering from this condition.

Regular eye check-ups are essential for diabetic patients. It is recommended that they visit an ophthalmologist annually for a preventive eye examination. This practice aids in early detection and minimizes the severity of diabetic retinopathy, and already diabetic patients who are diagnosed of diabetic retinopathy should visit the ophthalmologist' clinic every 6 months.

Symptoms of diabetic retinopathy become evident in advanced stages of the disease. Detecting the condition in its early stages greatly enhances the effectiveness of treatment.

What Is Diabetic Retinopathy?

Diabetic retinopathy is defined as the gradual damage to the retina of the eye in diabetic patients. It is one of the most common complications of diabetes. Elevated blood sugar levels lead to progressive damage in the retinal tissue, which contains light-sensitive receptors. Over time, this can result in a gradual loss of vision. The likelihood of developing diabetic retinopathy increases with the duration of diabetes, especially if the patient does not receive appropriate treatment and blood sugar control.

What causes diabetic retinopathy?

The retina is the light-sensitive part of the eye, requiring sufficient blood supply to function properly. Elevated blood sugar levels affect the structure and function of the tiny blood vessels that nourish the retina, leading to a series of changes, as follows:

1. Stage One: There is dilation of small blood vessels, causing leakage of blood from these vessels.
2. Stage Two: The changes intensify, affecting a larger portion of the retina, leading to more significant blood leakage.
3. Stage Three: The alterations in the blood vessels become more severe, reducing blood supply to the retina. As a result, weak and fragile new blood vessels form, causing even more extensive blood leakage.

Over time, as retinal damage worsens progressively, it can lead to retinal detachment and even complete loss of vision.

Symptoms of Diabetic Retinopathy

In the early stages of diabetic retinopathy, no symptoms are apparent. Symptoms only become noticeable as the condition progresses to advanced stages of retinal damage. These symptoms may include:

1. Blurred vision.
2. Double vision, where one sees two images of a single object.
3. Difficulty seeing at night.
4. Pain or redness in the eye.
5. Gradual vision loss.

Diagnosis of Diabetic Retinopathy

Diabetic retinopathy is diagnosed through a combination of factors:

1. Medical History: The patient's medical history plays a crucial role in diagnosis. It helps determine whether the patient has been consistent in receiving appropriate diabetes treatment and whether they exhibit symptoms of diabetic retinopathy.
2. Comprehensive Eye Examination: During a comprehensive eye examination, doctors:

• Evaluate changes in blood vessels.
• Assess the condition of the retina.
• Examine the optic nerve.
• Measure intraocular pressure.
• Evaluate visual acuity to determine if the patient requires corrective glasses.
• Fundus examination.

Early diagnosis and regular eye examinations are essential in managing diabetic retinopathy effectively and preventing its progression to more advanced stages that could result in vision loss.

Who Is at Risk of Developing Diabetic Retinopathy?

• Anyone with type 1 or type 2 diabetes is at risk of developing diabetic retinopathy.
• The longer an individual has diabetes, the higher their likelihood of developing this condition becomes.
• Additionally, certain factors can further increase the risk, including:

1. High Blood Pressure: Hypertension itself can cause damage to the retina, and when it coexists with diabetes, the risk of complications, including diabetic retinopathy, is elevated.
2. High Blood Fat Levels: Scientific studies have shown that maintaining normal blood fat levels can reduce the risk of retinal hemorrhages in diabetic patients.
3. Pregnancy: Research has found that pregnancy can accelerate the pace of eye complications in diabetic patients.

Preventive Eye Examinations for Diabetic Patients

It is crucial for every diabetic patient to visit an eye specialist annually to assess the potential for diabetes-related eye complications. This preventive examination is of utmost importance for several reasons:

1. Diabetic retinopathy, one of the most serious complications of diabetes, often exhibits no symptoms in its early stages but becomes apparent in advanced stages.
2. Early detection and timely treatment are essential to prevent vision loss.
3. Preventive examinations can identify diabetic retinopathy in its initial stages, before it affects vision.
4. Detecting diabetic retinopathy early and managing it effectively can slow down the gradual damage to the retina and delay the progression of diabetic retinopathy.

Preventive Measures and Treatment for Diabetic Retinopathy

The risk of developing diabetic retinopathy can be reduced through the following measures:

• Blood Sugar Control: Maintaining proper blood sugar levels by adhering to prescribed medications and regular medical check-ups.
• Blood Fat Management: Regulating blood fat levels.
• Blood Pressure Control: Managing hypertension.
• Smoking Cessation: Quitting smoking, adopting a healthy diet, and engaging in regular exercise.

These measures play a pivotal role in minimizing the risk of diabetic retinopathy.

Treatment for Diabetic Retinopathy

• The treatment for diabetic retinopathy depends on the extent of damage to the eye's retina. Regulating blood sugar levels remains the most crucial aspect of managing this condition.
• In the early stages, treatment includes blood sugar control, following the doctor's dietary recommendations, quitting smoking, and engaging in regular physical activity. These steps help mitigate the progression of retinal damage.
• If retinal damage progresses, causing blood leakage from blood vessels, doctors may employ laser therapy to halt bleeding and prevent the formation of fragile new blood vessels.

• In advanced stages, physicians may administer certain medications directly into the eye, such as ranibizumab and aflibercept. These medications can arrest retinal damage and improve vision.

• In severe cases, surgical intervention may be necessary to remove blood and damaged tissue from the retina.

Early detection, appropriate management, and timely treatment are essential in addressing diabetic retinopathy and preventing vision loss. Regular eye check-ups and consistent adherence to medical recommendations are crucial in managing this condition effectively.

References

• American Optometric Association (2019). "Diabetic Retinopathy." Available at: [https://www.aoa.org/patients-and-public/eye-and-vision-problems/glossary-of-eye-and-vision-conditions/diabetic-retinopathy] (Accessed: 16 February 2019).

• Abdhish R Bhavsar, Romesh Khardori (2018). "Diabetic Retinopathy Treatment & Management." Available at: [https://emedicine.medscape.com/article/1225122-treatment] (Accessed: 16 February 2019).
• NHS (2018). "Diabetic retinopathy." Available at: [https://www.nhs.uk/conditions/diabetic-retinopathy/] (Accessed: 16 February 2019).

Scientific Review and Linguistic Editing by Dr/ Ahmed Elkhatib.