Abstract
Objective To investigate the value of the Hess area ratio (HAR％) in predicting postoperative diplopia in patients undergoing surgery for orbital floor blowout fracture.Methods A retrospective analysis was performed on 19 patients with orbital floor blow-out fractures.All patients had diplopia and underwent surgical reconstruction with incision under the eyelashes which was performed by one surgeon within 1 month after injury except 1 case within 2 month.Manual Hess screen test was measured before and 3 months after surgery.Diplopia was checked and the severity was recorded accordingly.Results The postoperative HAR％ was significantly improved compared with preoperative HAR％ in patients who underwent repair surgery (P ＜ 0.05).All patients with preoperative HAR％ ＞ 85％ had no postoperative diplopia.Five of 6 (83.33％) patients having a preoperative HAR％ ＜ 65％ had postoperative diplopia,including 3 patients of Grade Ⅲ diplopia.For the patients with HAR％ between 65％ and 85％,6 of 8 (75％) had postoperative diplopia,with one of them having Grade Ⅲ diplopia.Conclusions It is effective using the HAR％ to convert Hess graphic representation to a numerical value,and feasible to predict surgical outcomes of diplopia in patients undergoing surgery for orbital floor blowout fractures. Key words: Orbital blowout fractues; Hess screen test; Diplopia
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