<prompt> A 26 yrs old male with restriction of eye movements in all directions moderate ptosis but with no diplopia or squint. Diagnosis is -Thyroid ophthalmopathyChronic progressive external ophthalmoplegiaMyasthenia gravisMultiple cranial nerve palsies  <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. 