Mohsen Bahmani Kashkouli - Eye Research Center, Rassoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
Parya Abdolalizadeh - Eye Research Center, Rassoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
Anahita Amirsardari - Eye Research Center, Rassoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran
Yasaman hadi - Eye Research Center, Rassoul Akram Hospital, Iran University of Medical Sciences, Tehran, Iran

Purpose: To compare lash ptosis (LP) with fellow eyelid in patients with unilateral myogenic (MP) and aponeurotic (AP) ptosis before and after the ptosis repair and assess the correlation between postoperative eyelid height and LP symmetricity. Methods: Patients of > 5 years old were included from June 2015 to April 2017. Eyelid examination, LP grading (0-3), and photography were performed before and at least 6 months after ptosis repair. Success of ptosis repair (levator resection) was defined as margin reflex distance 1 (MRD1) within 0.5 mm of the fellow eyelid, LP improvement as ≥1 grade improvement at the last follow up, and LP symmetricity as two eyelids being within 1grade. Results: There were 58 MP and 20 AP with mean age of 19.2 and 49.5 years and median follow up of 10 months. LP was observed in 89.5% of ptotic and 33.3% of control eyelids. Mean LP grade was significantly higher in the MP (1.5) than AP (1.1) which significantly improved to 0.6 and 0.4, respectively. However, it remained in 50.9% of MP and 31.2% of AP, postoperatively. LP symmetricity was observed in 97.4% of patients which was not correlated with MRD1 symmetricity. Lower levator function was the only significant factor correlated with LP. Conclusion: lated with more severe LP. Ptosis repair resulted in significant improvement of LP and its symmetricity with the fellow eyelid. LP symmetricity did not correlate with eyelid height symmetricity, postoperatively.