Quantification of midfacial symmetry in anophthalmic socket syndrome using template matching
Author: Akira Ishida
Base Hospital / Institution: Oculofacial Clinic Group
Rapid fire oral presentation
Abstract ID: 24-385
Purpose
Generally, symmetry of eyelid and ocular adenexal features often correlates with physical attractiveness. However, anophthalmic socket syndrome (ASS) often causes facial asymmetry which leads to poor psychological outcomes and affects a patient’s quality of life. Surgical treatment of patients with ASS improves facial symmetry, but no objective evaluation has been established. In this study, we studied the quantification of facial symmetry using template matching to objectively examine the treatment results of ASS.
Methods
The study included ASS patients who underwent orbital implant surgery and eyelid surgery from December 2019 to December 2023.Image J Fiji (version Java 1.8.0_322(64bit)) was used to analyse the image pre-and post-surgery, with comparisons made to the healthy side using template matching. First, facial images were imported and cropped around the eye, and the image of the healthy side was inverted. Then, using the image of the healthy side as a template, the template matching program was executed, and the results were scored. The program used zero-mean normalized cross-correlation. A score of 1 was considered the same image, and a score of 0 was considered an irrelevant image.Statistical analyses were performed using EZR version 1.61. The score was compared healthy and effected side before and after surgery by Wilcoxon signed-rank test. As a preliminary study, symmetry of 11 normal adults was examined and scored.
Results
Twenty-one patients (6 males and 15 females) were included in the study, with a mean age of 52.7 ± 18.9 (18-76) years. The mean score before surgery was 0.60 and after surgery was 0.73(P<0.04), showing significant improvement in 19 of the 21 patients. The mean score of normal adults was 0.92.
Conclusion
We have developed a method for quantifying facial symmetry using template matching for the first time in the world. Using template matching, the improvement in symmetry with treatment of ASS can be quantified. By quantification, the effect of ASS treatment can be objectively confirmed, although it did not reach the normal level.
Additional Authors
| First name | Last name | Base Hospital / Institution |
|---|---|---|
| Tomoyuki | Kashima | Oculofacial Clinic Group |
| Natsuyo | Yoshida-Hata | Oculofacial Clinic Group |
