Ptosis with weakness of orbicularis- oculi is an early feature of-
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.
Fisher syndrome
Myasthenia gravis
Eaten lambert syndrome
Thyrotoxicosis