Apart from what may be considered complications, the intervention of any aesthetic surgery can have undesired effects (scar sequelae, normal regional dynamic disorders, edema, iatrogenic acceleration of the aging process in the area). The orbital region is particularly sensitive to these undesirable effects due to its situation and the importance of the eyelids in facial sign language. The sum of these undesirable effects and not infrequent complications often place the plastic surgeon in a compromising situation. It is for this reason that in recent years we have made a special effort to analyze causes, to design new techniques, and to evaluate the combination of different techniques in an attempt to minimize these undesirable effects, so as to be able to offer patients more natural and safer results. It is with this intention that this paper records some anatomical and functional details of the eyelids, analyzes the physiology of the aging process, and examines some classic and modern techniques.