Facial Asymmetry as a Universal Signature: A Morphometric, Perceptual, and Artistic Approach

Facial asymmetry is universal, yet its directionality and its relationship with patients' self-perception remain underexplored. This study evaluates the association between 3-dimensional-measured malar asymmetry and the patient's declared "better side" in an aesthetic population.

One hundred twenty consecutive patients were photographed in standardized frontal view using the Vectra H2 system. Malar width was assessed by measuring the zygion-midline distance on each side, recorded twice and averaged. Patients completed a 10-item ad hoc questionnaire addressing their preferred side, perceived asymmetries, photographic habits, and mirror-photograph differences. Observed frequencies were compared to a theoretical 50/50 distribution using chi-square testing.

Objective asymmetry was present in 98.3% of subjects, with a wider left side in 118 cases (P < 0.001). In contrast, side preferences were evenly distributed between left (45%) and right (52%) (P = 0.41). No correlation was found between the anatomically wider side and the declared preferred side (P = 0.62). Forty percent of patients reported noticeable differences between their mirror image and photographs.

Although a left-sided directional asymmetry predominates, it does not align with patients' stated preferences or their subjective self-image. Recognizing this dissociation between structure and perception during consultation improves expectation management and reduces postoperative misunderstandings in facial aesthetic procedures.