Corneal Micro-Incision Cyclotorsion Measurement After Small Incision Lenticule Extraction And Its Influencing Factors
Published 2025 - 43rd Congress of the ESCRS
Reference: PP12.07 | Type: Free paper | DOI: 10.82333/7wgk-t261
Authors: Alon Tiosano* 1 , Inbar Smila Perchik 2 , Dor Key 3 , Ori Mekiten 3 , Lear Gilbay 4 , Shiran Manor 4 , Nadav Loebl 5 , Orly Gal-Or 6 , Irit Bahar 1
1Ophthalmology,Rabin Medical Center,Petach Tikva,Israel;Ophthalmology Artificial Intelligence Center,Rabin Medical Center,Petach Tikva,Israel;Faculty of Medicine,Tel Aviv University,Tel Aviv,Israel, 2Ophthalmology,Rabin Medical Center,Petach Tikva,Israel;Ophthalmology Artificial Intelligence Center,Rabin Medical Center,Petach Tikva,Israel, 3Ophthalmology,Rabin Medical Center,Petach Tikva,Israel;Faculty of Medicine,Tel Aviv University,Tel Aviv,Israel, 4Ophthalmology Artificial Intelligence Center,Rabin Medical Center,Petach Tikva,Israel, 5Artificial Intelligence Center,Beilinson Medical Center Innovation,Petach Tikva,Israel;Faculty of Computer Science,Reichman University,Herzliya,Israel, 6Ophthalmology,Rabin Medical Center,Petach Tikva,Israel;Faculty of Medicine,Tel Aviv University,Tel Aviv,Israel;Ophthalmology Artificial Intelligence Center,Rabin Medical Center,Petach Tikva,Israel
Purpose
To evaluate ocular cyclotorsion following Small Incision Lenticule Extraction (SMILE) using a corneal micro-incision measurement method under slit-lamp examination in the seated position and to investigate the associated factors.
Setting
This was a prospective cohort study. From January to August 2024, 131 cases of patients (262 eyes) of Jinan Mingshui Eye Hospital were consecutively selected in this study.
Methods
Head position was readjusted by cross-axis alignment before the SMILE procedure. The location and angle of the incision site of the cornea was measured by a program designed based on the matlab software after surgery, and compared the micro-incision cyclotorsion with static cyclotorsion component (SCC) measured by the excimer laser platform. Eyes were divided into a group with the amount of cyclotorsion less than 4 degrees and a group with the amount of cyclotorsion 4 degrees or more. The correlations between the micro-incision cyclotorsion and the age, preoperative refraction, corneal curvature, corneal diameter, CCT, corneal regularity index, Kappa angle, and Q values were evaluated by Pearson correlation coefficient.
Results
The mean value of micro-incision cyclotorsion was (4.37±2.88)°. After randomly selecting single eyes for the analysis, the amplitude of micro-incision cyclotorsion was significantly higher than that of the SCC (t=6.14，P=0.000). A positive correlation was observed between micro-incision cyclotorsion and the kappa angle（r=0.17，P=0.049）.Positive correlations were identified between the degree of cyclotorsion and corneal diameter, as well as preoperative spherical values and SE in the low cyclotorsion group（r=0.25, P=0.025; r=0.28, P=0.02; r=0.26, P=0.036）. In contrast, in the high cyclotorsion group, the degree of cyclotorsion showed a positive correlation with corneal thickness (r=0.28，P＜0.05).
Conclusions
Micro-incision cyclotorsion measurement can serve as an effective method for evaluating ocular cyclotorsion following SMILE. Predominantly, postoperative incision rotation exhibited excyclotorsion. Factors such as the Kappa angle, Sphere, SE, corneal diameter, and corneal thickness may be associated with the micro-incision cyclotorsion.