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Diabetic retinopathyDefinition Diabetic retinopathy is progressive damage to the eye's retina caused by long-term diabetes. It can cause blindness. Causes, incidence, and risk factors Diabetic retinopathy is caused by damage to blood vessels of the retina, the light-sensitive outer layer of the eye. It is classified as non-proliferative or proliferative.
Diabetic retinopathy is the leading cause of blindness in working-age Americans. People with both type 1 diabetes and type 2 diabetes are at risk for this condition. The likelihood and severity of retinopathy increase the longer you have diabetes, and is likely to occur earlier and be more severe if your diabetes is poorly controlled. Almost everyone who has had diabetes for more than 30 years will show signs of diabetic retinopathy. Symptoms One of the first symptoms of diabetic retinopathy is poor night vision. Other symptoms include:
However, many people have no symptoms before major bleeding occurs in the eye. This is why everyone with diabetes should have regular eye exams. Signs and tests In nearly all cases, diabetic retinopathy can be diagnosed with an eye exam. A retinal photography test may also be used.Treatment The goal of treatment is to control your blood sugar, blood pressure, and cholesterol. Treatment, however, usually does not reverse existing damage, but will keep the disease from getting worse. Drugs that keep abnormal blood vessels from growing in patients with proliferative diabetic retinopathy are under development. Laser surgery may be used to keep vessels from leaking or to get rid of abnormal fragile vessels. A surgical procedure called vitrectomy is used when there is bleeding (hemorrhage) into the eye. It may also be used to repair retinal detachment. Support Groups American Diabetes Association - www.diabetes.org National Diabetes Information Clearinghouse - www.diabetes.niddk.nih.gov Prevent Blindness America - www.preventblindness.org Expectations (prognosis) Patients who have good control of their blood sugar and blood pressure may improve their outcomes. Diabetic retinopathy can lead to blindness without treatment. Complications Calling your health care provider Call for an appointment with an ophthalmologist (eye doctor) if you have diabetes and you have not seen an ophthalmologist in the past year. Prevention People with diabetes should see an ophthalmologist to have their eyes dilated once a year. This lets the doctor see the retina. Frequent eye exams and laser surgery, if necessary, can prevent blindness in most cases. References Sydorova M, Lee MS. Vascular Endothelial Growth Factor Levels in Vitreous and Serum of Patients with either Proliferative Diabetic Retinopathy or Proliferative Vitreoretinopathy. Ophthalmic Res. 2005 Jun 29;37(4):188-190. Singerman L. Findings of the Phase 2 Trial of the Safety and Efficacy of Pegaptanib Sodium (Macugen™) in Patients With Diabetic Macular Edema. Invest Ophthalmol Vis Sci 2005;46: E-Abstract 4674. Rosenblatt RJ, Benson WJ. Diabetic Retinopathy. In: Yanoff M, ed. Opthalmology. 2nd ed. St. Louis, MO: Mosby; 2004;877-887. Illustrations
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