It is not always clear what causes the blockage in the tiny blood vessels to the cranial nerves, depriving these nerves of oxygen. In some cases, diabetes, high blood pressure or hardening of the arteries may be risk factors. In young patients, migraine may affect these tiny vessels.
Occasionally MCNP may result from a blocked vessel in the covering of the brain, which can be associated with pain around the eye. The nerves are not permanently injured, and over a period of six to 12 weeks, a good portion of normal function should recover.
If double vision from MCNP does not go away, it is very important to tell your Eye M.D. If you experience double vision or a droopy eyelid and have not been diagnosed with MCNP, it is critical to see your Eye M.D. as soon as possible, as these can be symptoms of a number of life-threatening conditions.
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