Too much sugar in your blood can damage the tiny blood vessels that nourish the retina. It may even block them completely. As more and more blood vessels become blocked, the blood supply to more of the retina is cutoff. This can result in vision loss. In response to the lack of blood supply, the eye attempts to grow new blood vessels. But, these new blood vessels don't develop properly and can leak easily. Leaking blood vessels can cause a loss of vision. Scar tissue may also form, which can pull on the retina. Sometimes, this can cause the retina to detach.

Elevated blood sugar levels can also affect the eyes' lenses. With high levels of sugar over long periods of time, the lenses can swell, providing another cause of blurred vision.

Mar. 27, 2012

You Are ... The Campaign for Mayo Clinic

Mayo Clinic is a not-for-profit organization. Make a difference today.