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Browlift: Correlation Of Artificial Intelligence With Excursion Measurements In Identifying Surgical Efficacy
Thanapoom Boonipat, MD, Nathan Hebel, BS, Steven Callori, BS, Jason Lin, MD, Uldis Bite, MD.
Mayo Clinic, Rochester, MN, USA.

PURPOSE:
We analyze the correlated manual browlift measurements with emotional measurements done using artificial intelligence. We aim to assess the efficacy of browlifts while minimizing undesired expressions such as surprise. METHODS:
Pre and Post-operative photos of browlift and upper blepharoplasty patients between January of 2006 and December of 2018 were analyzed manually to measure brow excursion at three locations on each eye; the medial tip, mid-pupillary line, and highest lateral point, standardized by the iris diameter (12mm). The same photos were analyzed using the FaceReader artificial intelligence (AI)software for emotional expression.
RESULTS:
Pre/post- surgery brow measurements (mm) were significantly changed (p<0.05, left lateral 19.8->23.1, left center 18.7->21.5, left medial 13.5->15.8; right lateral 19.1->22.8, right center from 18.3->21.6, and right medial from 13.4->15.8). The AI showed decreased perceived sadness (14.3% to 7.4%) and anger (13.6%->5.7%) and increased happiness (1.77%->9.9%) after surgical intervention (all p<0.05). Surprise expression was not significantly changed (0.9%->1.8%, p = 0.2915).Among a subgroup of patients with a change in Anger score pre/post, a correlation of -0.749 was identified between changes in left central brow position and anger score with an effect estimate of -7.185(r=-0.749, β=-7.185, p=0.00000682),and for right brow(r =-0.697,β=-7.838,p=0.0000543). CONCLUSION:
Browlift resulted in increased appearance of happiness without significantly increasing the appearance of surprise. These findings correlated to the manual measurements demonstrated that even modest changes in brow position resulted in dramatic alterations in artificial intelligence observed emotion. Future implementation of this work should be aimed at finding the optimal brow elevation for the desired emotional alterations.


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