Could someone please explain what’s the full thickness resection method for treatment of ptosis?

This is a awful surgery that destroys the upper eyelid and makes it virtually impossible to subsequently repair the upper eyelid. Surgeons who do this are throwing up their hands and giving up on the eyelid. I have never seen an acceptable fix with so-called full thickness ptosis repair. The concept is overly simplistic--the eyelid is heavy a couple of millimeters, so the surgeon cuts out this much of the eyelid. It is results in a stiff eyelid with an overly short eyelid platform. My best advise to you is stay away from this dreadful surgery. I fix many, many eyelids after surgery after surgery by world famous surgeons from all over the world including Los Angeles. I have fixed eyelids after full thickness ptosis surgery but it is never as good and an eyelid that has not had this approach. If you have only had two ptosis surgeries and you have good eyelid excision, it is highly likely that your eyelid can be fixed with a revisional anterior levator ptosis surgery but it requires a very patient, fussy, and talented eyelid surgeon. Full thickness ptosis surgery is not an acceptable approach and it most definitely does not produce a cosmetically acceptable result. Your eyes can be your best feature.