Shanti, aged 27 yrs presented with complaints of difficulty in reading near print. There is ptosis and diplopia in all directions. She is having-
Amongst the given options ptosis can be caused by 3rd nerve palsy and myasthenia gravis. However, in 3rd nerve palsy diplopia will not occur on Down & out gaze (due to sparing of SO and LR) while in myasthenia gravis, diplopia will occur in all directions.
III CN palsy
Myasthenia gravis
Presbyopia
VI CN palsy