Brow ptosis, which means the eyebrow dropping, is usually age related, however it could be related to the facial nerve palsy.
Brow ptosis is managed surgically to refixate the brow in a higher position, hereby increasing the eye aperture.
There are a variety of brow lift procedures. For further information you can revert to the review article on brow lift procedure that was publish in the Orbit journal by Mr Radwan Almousa (Almousa R, Amrith S, Sundar G. Browlift-a South East Asian experience. Orbit. 2009;28:347-53.)