The ptotic eyelid is overdiagnosed by the neurologist and neurosurgeon, and underdiagnosed by the ophthalmologist and oculoplastic surgeon. The former often embark on major diagnostic endeavors for patients with an ‘obvious’ dehiscence of the levator aponeurosis, while the latter may overlook some significant associated neurologic signs and symptoms. After accurate diagnosis and treatment, ptosis may be repaired by a levator advancement procedure if the levator muscle has any function, or a slinging procedure (preferably open sky) if there is no levator function.1 Good eyelid function with excellent cosmesis is the desired result of ptosis surgery.