<prompt> Ataxia, nystagmus and ophthalmoplegia is seen in-Mysthenia gravisChronic progressive external ophthalmoplegia3rd nerve palsyNone  <response>: Chronic progressive externalophthalmoplegia CPEO, is a type of eye disorder characterized by slowly progressive inability to move the eyes and eyebrows. It is often the only feature of mitochondrial disease, in which case the term CPEO may be given as the diagnosis. It is characterized by Nystagmus Ataxia Ophthalmoplegia Ref khurana 6e 