Factors that affect eyelid show and their importance in upper eyelid blepharoplasty: a systematic review.

An understanding of the complexity of the surgical anatomy of the upper eyelid and the surrounding structures is mandatory when trying to minimize complications and achieve excellent cosmetic results during eyelid surgery. Postoperative upper eyelid asymmetry is one of the most common causes of patients' dissatisfaction, and several parameters should be taken into consideration when performing cosmetic blepharoplasties and ptosis surgery. Tarsal platform show and brow fat span are two of the most important variables pertaining to the perception of beauty and youthfulness that every oculoplastic and facial plastic surgeon should address when performing such surgery. The aim of this review paper is to provide a detailed anatomy of the upper eyelid and the surrounding structures, to highlight all the relevant factors that contribute to the perception of beauty and the changes that occur to the aging face and to address the preoperative factors that need to be carefully examined before performing upper eyelid surgery.