Evaluation of intraoperative lagophthalmos formula for levator resection in congenital ptosis in Egyptian patients.

Abstract

To evaluate the recent intraoperative lagophthalmos formula method for levator resection in determining postoperative lid height in congenital ptosis on Egyptian patients. This is a prospective case series which included 20 eyelids of 17 Egyptian children with congenital ptosis whose levator function is 4 mm or better. They underwent levator muscle resection guided by the recently presented intraoperative lagophthalmos formula. Preoperative Margin-to-Reflex Distance 1 (MRD1) and levator function were measured then intraoperative palpebral fissure opening was determined from formula: Intraoperative lagophthalmos = 9.08 - (0.48 × Preoperative MRD1) - (0.26 × Levator function). Success was defined as postoperative MRD1 ⩾ 3 mm and difference between both eyelid height ⩽1 mm at 6 months. From 20 eyelids, there were five cases with mild (25%), 11 with moderate (55%), and four with severe (20%) ptosis. They showed success in four cases (80%), eight cases (73%), and three cases (75%) in each degree respectively with an overall success of 15 cases (75%). Proposed intraoperative lagophthalmos formula showed relatively good results in predicting postoperative eyelid level in Egyptian children with simple congenital ptosis with fair to good levator function.