By looking into the back of your eye (the retina), eye doctors can see if there are changes in the blood vessels. Certain changes increase your risk of vision loss from diabetes or other conditions. The earliest changes can be seen only with a special test called fluorescein angiography.
For this test, a chemical is injected into a vein in your hand or arm while the eye doctor is looking at the back of your eyes with a special instrument. The chemical called fluorescein temporarily lights up the blood vessels. The eye doctor can easily see if there are leaks or other abnormal changes in the vessels.
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