The Study Of High Order Aberration Changes After Ray-Tracing-Guided Fs-Lasik For Chinese Myopia And Astigmatism
Published 2025 - 43rd Congress of the ESCRS
Reference: PP15.05 | Type: Free paper | DOI: 10.82333/vyqp-2310
Authors: Husna Topcu* 1 , Mevlut Celal Ocal 1 , Mehmet Altun 1 , Dilek Yasa 1 , Gonul Karatas Durusoy 1 , Bulent Kose 1
1Department of Ophthalmology,Osmangazi Aritmi Hospital,Bursa,Türkiye
Purpose
To evaluate the refractive outcomes and the changes of higher order aberrations (HOAs) after ray-tracing-guided femtosecond laser assisted-laser in situ keratomileusis (FS-LASIK) for myopia.
Setting
Ninety-nine eyes of 51 patients who underwent ray-tracing guided FS-LASIK in Beijing Tongren Hospital in were enrolled in December 2023 to January 2024 were enrolled in this prospective nonrandomised unmasked observational study.
Methods
Comprehensive ophthalmic evaluations were performed preoperatively, as well as at 1 day, 1 week, 1 month, and 6 months postoperatively. Assessments included visual acuity, manifest refraction. Ocular wavefront aberrations were measured using the InnovEyes Sightmap diagnostic device. All subjects underwent ray-tracing guided FS-LASIK with the algorithm created from individualized virtual eye model. All data were collected preoperatively and 6 months following treatment. The analysis focused on total HOAs, spherical aberration (SA) and coma.
Results
All surgical procedures proceeded smoothly without complications. The mean preoperative manifest refraction spherical equivalent was -5.21±1.83D. 30 patients（60 eyes）have completed the 6-month follow-up visit. 37 eyes out of 60 were high myopia preoperatively (SE<-6.0D). The HOAs and coma were significantly increased in high myopic eyes both at the pupil size of 4mm and 6mm. Meanwhile in the low to moderate myopic eyes, there was no significant changes of total HOAs and coma at the pupil size of 4mm and were significantly increased at the pupil size of 6mm. SA reduced to a lower absolute value (negative value at the pupil size of 4mm) in all the eyes postoperatively. All the value changes were less than 0.1 without clinical significance.
Conclusions
Ray-tracing-guided FS-LASIK demonstrated favourable refractive outcomes in the long-term follow up. This novel algorithm of ablation is effective to manage the HOAs without clinical significance both in bright (4mm pupil size) and dark (6 mm pupil size) light conditions . The total HOAs and the SA were significantly affected by the pupil size measured by the sightmap platform.