What Is Diabetic Retinopathy?
High blood sugar levels in those with diabetes can damage blood vessels in the retina, the lining at the back of the eye that contains the light-sensitive cells responsible for transmitting visual information to the brain via the optic nerve. This damage is referred to as diabetic retinopathy. Retinopathy is more common in those who have poor control of their blood sugar or who have had diabetes for a long time.
Types of Diabetic Retinopathy
There are two types of diabetic retinopathy:
Nonproliferative Diabetic Retinopathy (NPDR) can be classified into three stages: mild, moderate, and severe. Mild NPDR is usually asymptomatic. Moderate and severe forms of NPDR can cause vision loss through the following conditions:
- Macular edema is the buildup of fluid in the macula – the central part of the retina that allows for sharp, central vision – caused by leaking blood vessels. This macular swelling causes blurring and distortion. Macular edema is the most common cause of vision loss in those with diabetes.
- Macular ischemia occurs when the blood vessels in the macula become closed due to sugar deposits. The lack of blood supply prevents the macula from working properly and causes central blurring of vision.
Proliferative Diabetic Retinopathy (PDR) is characterized by abnormal blood vessels growing on the surface of the retina (neovascularization). The newly grown blood vessels are fragile and leak, causing a vitreous hemorrhage in which the blood leaks into the clear, gel-like substance of the eye. This can cause floaters that interfere with vision to a small degree, or it can block all vision in the affected eye if the hemorrhage is large enough.
The neovascularization associated with PDR can also create scar tissue. If this scar tissue shrinks, it can wrinkle and pull on the retina. Wrinkling of the macula causes distortion and blurring of central vision. If the pull of the scarring is strong enough, it can cause a tractional retinal detachment. This may lead to severe vision loss or blindness.
Symptoms of Diabetic Retinopathy
Diabetic retinopathy symptoms are typically hard to notice at first, but as the condition progresses, symptoms can develop that include:
- An increasing number of floaters
- Blurred vision
- Blank or dark areas in your field of vision
- Poor night vision
- Colors appear faded or washed out
Diagnosing Diabetic Retinopathy
Diabetic retinopathy is diagnosed via a comprehensive eye examination during which your eyes will be dilated and the retina examined using an ophthalmoscope. You may also undergo a fluorescein angiogram, a test in which dye is injected into your arm and travels to the blood vessels in your eyes. A specialized camera takes photographs to determine if and where leaks and abnormal blood vessels are occurring.
What Are the Treatment Options for Diabetic Retinopathy?
The best treatment option for diabetic retinopathy is the strict control of blood sugar, as this significantly reduces the risk of vision loss. Should additional treatment be necessary, treatment options available at the Dean McGee Eye Institute include:
Diabetic Retinopathy Treatment at the Dean McGee Eye Institute
For 45 years, the Dean McGee Eye Institute has been on the cutting-edge of eye care. Clinical trials are currently underway to develop new treatments for diabetic retinopathy. If you or a loved one are experiencing symptoms of diabetic retinopathy or you have been advised to see a retina specialist, our team of ophthalmologists who specialize in diseases of the retina and vitreous would love to provide an eye examination to determine if treatment is needed. Call 405.271.1092 or 800.787.9014 to make your appointment.