The effect of anterior transposition of the inferior oblique muscle on eyelid configuration and function.

<bold>Purpose: </bold>To evaluate the alteration of lower lid configuration and function with anterior transposition surgery of the inferior oblique (IO) muscle.<bold>Patients and Methods: </bold>A prospective clinical trial was conducted on a consecutive series of patients underwent anterior transposition of the IO as a sole operation. All patients received a thorough ophthalmic examination 1 day before and 3 months after surgery. Output parameters were consisted of palpebral fissure, margin reflex distance 1-2, lower lid function, hertel value, and lower lid crease. The differences of the collected data were calculated for statistical significance by using the Wilcoxon test.<bold>Results: </bold>A total of 19 eyes of 16 consecutive patients were included. The median preoperative grade of IO overaction was 3.5 (ranging from 3 to 4), which decreased to 0 (ranging from 0 to 2) postoperatively (P < 0.05). No significant change was observed in all parameters 3 months postoperatively (P > 0.05).<bold>Conclusion: </bold>In this study, no significant effect on lower lid configuration and function was observed following IO anterior transposition in which the disinserted muscle was placed posterior to inferior rectus insertion. [ABSTRACT FROM AUTHOR]