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Alternative Names Return to topDiabetic third nerve palsy; Pupil-sparing third cranial nerve palsy
Definition Return to top
Cranial mononeuropathy III is a complication of diabetes that involves double vision and eyelid drooping.
Causes Return to top
Cranial mononeuropathy III - diabetic type is a mononeuropathy, which means that only one nerve is damaged. It involves the third cranial (oculomotor) nerve, which is one of the cranial nerves that controls eye movement. This type of damage usually occurs with diabetic neuropathy.
Cranial mononeuropathy III is the most common cranial nerve disorder in people with diabetes.
Symptoms Return to top
Exams and Tests Return to top
An examination of the eyes will determine whether only the third nerve is affected or if other nerves have also been damaged. Signs may include:
In some cases, it may not be clear if the nerve damage is due to diabetes or some other cause, such as an aneurysm. Tests to rule out other causes may include:
Treatment Return to top
There is no specific treatment to correct the nerve injury.
Treatments may include:
Some people may recover without treatment.
Outlook (Prognosis) Return to top
Many patients get better over time, although some have permanent eye muscle weakness.
Possible Complications Return to top
When to Contact a Medical Professional Return to top
Call your health care provider if you have double vision and it doesn't go away in a few minutes, especially if you also have eyelid drooping.
Prevention Return to top
Control of blood sugar levels in people with diabetes may reduce the risk of developing this disorder.Update Date: 2/13/2008 Updated by: Luc Jasmin, MD, PhD, Departments of Anatomy & Neurological Surgery, University of California, San Francisco, CA. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.