An examination of the eyes will show various patterns of eye movement to determine whether only the third nerve is affected or if other nerves have also been damaged. Often, the gaze is dysconjugate (eyes are not aligned). Pupil reaction may or may not be normal. Sometimes eye pain is also reported.
In some cases, it may not be clear if the nerve damage is due to diabetes or some other cause such as an aneurysm. In some cases, a lumbar puncture and/or angiogram may be necessary to rule out other causes.
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