High glucose levels can damage the retina
Comparison of healthy and diabetic retina
Chronic or uncontrolled diabetes can affect the fine capillaries of our film layer -- the retina. The high sugar in the blood will cause blockage and dropout of retinal vessels - with resulting bleeding (hemorrhage), leakage (edema), poor oxygen (ischemia) and possible scarring with detachment.
The effects of diabetes can be worsened if there is also a history of tobacco use and hypertension.
Unfortunately patients will often not see or feel the changes to the retina until the condition has advanced. That is why it is important to have your retina evaluated.
If diabetes has affected the retina, then laser, injections or surgery may be necessary to stabilize and improve the damage.
Annual examinations are recommended for all diabetic patients
Multipart video explaining Diabetic Retinopathy