Ptosis with weakness of orbicularis- oculi is an early feature of-: (A) Fisher syndrome, (B) Myasthenia gravis, (C) Eaten lambert syndrome, (D) Thyrotoxicosis
Answer is B. 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.