Is it advisable to go for revisional ptosis surgeyru?

Possibly: Eyelid ptosis is a droop of the lid due to dysfunction of the levator muscle which elevates the lid. The surgery will shorten the muscle which gives it a smaller range of action and therefore lifts the lid. Revision, i assume in your case, means you have had this done in the past and it is now re-drooping. With a proper oculoplastic surgeon, revision can be quite effective.

Depends : It depends which kind of ptosis you refer to. There is eyelid or breast ptosis are the most common ones. Sometimes ptosis surgery needs to be repeated because of the eyes are uneven or because it recurred . In either of cases it is appropriate to do it, if sufficient time has gone by.