<prompt> Ptosis with weakness of orbicularis- oculi is an early feature of-Fisher syndromeMyasthenia gravisEaten lambert syndromeThyrotoxicosis  <response>: Myasthenia gravis is a major cause of ptosis diplopia. The distribution of muscle weakness has a characteristic pattern. The cranial muscles particularly the lids and extraocular muscles are often involved early in the course of MG, and diplopia and ptosis are common initial complaints. 