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Diabetes can harm the eyes. It can damage the small blood vessels in the retina, the back part of your eye. This condition is called diabetic retinopathy.
Diabetes also increases the chance of having glaucoma, cataracts, and other eye problems.
Retinopathy - diabetic; Photocoagulation - retina; Diabetic retinopathy
Diabetic retinopathy is caused by damage from diabetes to blood vessels of the retina. The retina is the layer of tissue at the back of the inner eye. It changes light and images that enter the eye into nerve signals, which are sent to the brain.
There are two stages of diabetic retinopathy:
The chance of getting retinopathy and having a more severe form is higher when:
Some types of exercise can make diabetic retinopathy worse. If you have retinopathy, check with your doctor before starting an exercise program.
Other eye problems that can develop in persons with diabetes include:
High blood sugar or changes in blood sugar level often cause blurred vision. This is because the lens in the middle of the eye cannot change shape when there is too much sugar and water in the lens. This is not the same problem as diabetic retinopathy.
Most often, diabetic retinopathy has no symptoms until the damage to your eyes is severe. This is because damage can occur to much of the retina before your vision is affected.
Symptoms of diabetic retinopathy include:
Many people with early diabetic retinopathy have no symptoms before bleeding occurs in the eye. This is why everyone with diabetes should have regular eye exams.
Your eye doctor (ophthalmologist) will examine your eyes. You may first be asked to read an eye chart. Then you will receive eye drops to widen the pupils of your eyes. Tests you may have involve:
If you have the early stage of diabetic retinopathy (nonproliferative), the eye doctor may see:
If you have advanced retinopathy (proliferative), the eye doctor may see:
This exam is different from going to the eye doctor (optometrist) to have your vision checked and to see whether you need new glasses. If you notice a change in vision and see an optometrist, make sure you tell the optometrist that you have diabetes.
Persons with early diabetic retinopathy may not need treatment. But they should be closely followed by an eye doctor who is trained to treat diabetic eye diseases.
Once your eye doctor notices new blood vessels growing in your retina (neovascularization) or you develop macular edema, treatment is usually needed.
Eye surgery is the main treatment for diabetic retinopathy.
Medicines that are injected into the eyeball may help prevent abnormal blood vessels from growing.
Follow your eye doctor's advice on how to protect your vision. Have eye exams as often as recommended, usually once every 1 to 2 years.
If you have diabetes and your blood sugar has been very high, your doctor will give you new medicines to lower your blood sugar level. If you have diabetic neuropathy, your vision can get worse for a short time when you begin taking medicine that improves your blood sugar level.
Many resources can help you understand more about diabetes. You can also learn ways to manage your diabetic retinopathy.
Managing your diabetes may help slow diabetic retinopathy and other eye problems. Control your blood sugar (glucose) level by:
Treatments can reduce vision loss. They do not cure diabetic retinopathy or reverse the changes that have already occurred.
Diabetic eye disease can lead to reduced vision and blindness.
Call your doctor if any of the following symptoms are new or are becoming worse:
Tight control of blood sugar, blood pressure, and cholesterol is very important for preventing diabetic retinopathy.
Do not smoke. If you need help quitting, ask your doctor or nurse.
American Academy of Ophthalmology Retina Panel. Preferred Practice Pattern Guidelines. Diabetic retinopathy. 2012. Available at: www.aao.org/ppp. Accessed August 5, 2014.
American Diabetes Association. Standards of medical care in diabetes -- 2014. Diabetes Care. 2014;37 Suppl 1:S14-S80.
Brownlee M, Aiello LP, Cooper ME, et al. Complications of diabetes mellitus. In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM. Williams Textbook of Endocrinology. 12th ed. Philadelphia, PA: Saunders Elsevier; 2011:chap 33.
Rosenblatt BJ, Benson WE. Diabetic retinopathy. In: Yanoff M, Duker JS, Augsburger JJ, eds. Ophthalmology. 3rd ed. Philadelphia, PA: Mosby Elsevier; 2008:chap 6.19.