<prompt> A 26 years old male with restriction of eye movements in all directions and moderate ptosis but with no Diplopia or squint. Diagnosis isThyroid ophthalmopathyChronic progressive external ophthalmoplegiaMyasthenia gravisMultiple cranial nerve palsies  <response>: Ans. b Chronic progressive external ophthalmoplegiaRef: Kanski 7e, p. 852Restriction of ocular movement in both eyes are symmetrical in chronic progressive external ophthalmoplegia, so there is no diplopia. 