Carotid Artery Diseases DNA, Mitochondrial Diagnosis, Differential Human Mitochondrial Myopathies Myasthenia Gravis Myotonia Ocular Motility Disorders Oculomotor Muscles Oculomotor Nerve Point Mutation abducens nerve paralysis arteriography brain injury carotid artery obstruction clinical feature cranial nerve paralysis digital subtraction angiography diplopia dura mater eye movement disorder eye surgery human magnetic resonance angiography meningitis mitochondrial dna mitochondrial myopathy myasthenia ophthalmoplegia point mutation