Customized Minimally Invasive Orbital Decompression Surgery Improves Lower Eyelid Retraction and Contour in Thyroid Eye Disease

Purpose: To investigate the outcome of a customized approach with targeted zygomatic basin bone removal orbital decompression in lower eyelid retraction and contour of patients with thyroid eye disease. Methods: In a comparative case series, clinical charts and photos of a consecutive sample of 92 patients with thyroid eye disease submitted to different types orbital decompression were studied. Exophthalmos, midpupil to lower eyelid margin distances (MRD2) at 11 meridians, and globe position were measured and compared according to the types of decompression. Each eyelid was also labeled as within or outside normal limits regarding both contour pattern analysis and MRD2 compared with a control normal range. Eyelid contour and globe position from patients with orbital decompression with zygomatic basin removal were compared with those without basin removal. Results: A total of 105 orbits from 57 patients met the study inclusion criteria. Ninety-eight orbits had lateral orbital wall decompression and in 53% of these cases, bone in the zygomatic basin was removed. Removal of the zygomatic basin did not significantly enhance decrease in proptosis, but significantly induced vertical globe descent and improved MRD2 (p