What happens if I just have an upper eyelid lift versus both an upper eyelid lift and a lower eyelid lift?

Surgery should only be performed when and where it is necessary to do so.  If an individual only has findings that may be addressed with surgery in the upper eyelids, then only an upper eyelid lift or blepharoplasty should be performed.  Conversely, if the only findings that could be addressed with surgery are in the lower eyelids, then only the lower eyelids should be treated.

Most commonly, however, an individual who is a candidate for an upper eyelid lift or blepharoplasty is also a candidate for a lower eyelid lift or blepharoplasty.  The most natural appearing results arise when you address both the upper and lower eyelids in the event that the upper and lower eyelids both require attention.  Treating one and not the other in such a case can result in an incongruous appearance that may look strange and unnatural.