The goal of an upper lid blepharoplasty is to remove excess skin and a little bit of fat from the upper lid area causing the puffiness. There are two fat compartments in the upper lid and when removed gives a more natural contour to the upper lid and will not have any effect on a slim face.
The goal of lower eyelid surgery is to remove the fat bags that create puffiness on the lower lids. Additionally, a small strip of excess skin can be removed through an incision just below the eyelashes. All the fat is typically removed through a transconjunctival approach on the inside of the eyelid.
The browlift procedure is intended for a patient who has very low eyebrows and strong facial muscle contraction, such as vertical corrugator line between the eyebrows and horizontal frontalis lines.
Injecting fat into the cheek and lower eyelid sulcus is not a good idea because of the inconsistency in the amount of fat that will be resorbed.
Repeat lower eyelid surgery will not cause lower lid droop if done correctly.