It usually affects eye movements, the response of the pupils to light, or both. These paralyzes can occur when pressure is put on the nerve or the nerve does not receive enough blood. There is diplopia in certain directions, the eyelid droops, and the pupil may be dilated. The most common causes are a) Pressure on the nerve: an aneurysm in an artery that supplies the brain or a disorder that causes the brain to herniation. b) Inadequate blood supply to the nerve: diabetes, high blood pressure or other disorders that affect the blood vessels.

Treatment: Double vision can be treated by using eye patches and if it persists, use of prism glasses or muscle surgery may help. Anti-inflammatories, such as ibuprofen, can help if there is pain associated with microvascular cranial nerve palsy. You have to control your blood pressure and blood glucose. Risk factors are diabetes, high blood pressure and smoking, also increase the risk of having a stroke.