ESCRS - PP03.03 - Efficacy And Predictability Of Of Lasik Surgery Using Ray Tracing Technology For Myopic Eyes With Low Astigmatism (<0.75 D).

Efficacy And Predictability Of Of Lasik Surgery Using Ray Tracing Technology For Myopic Eyes With Low Astigmatism (<0.75 D).

Published 2023 - 41st Congress of the ESCRS

Reference: PP03.03 | DOI: 10.82333/5a2e-5024

Authors: George He* 1 , Chandra Bala 2 , Anna Siu 3

1PersonalEYES,Sydney,Australia;Westmead Hospital,Westmead,Australia;University of Sydney,Sydney,Australia, 2PersonalEYES,Sydney,Australia;Macquarie University,Macquarie,Australia, 3PersonalEYES,Sydney,Australia

Astigmatism can be induced when treating low cylinders (cyl) due to measurement and/or treatment errors. This study examines the astigmatic outcomes of novel ray tracing based lasik treatment in myopic eyes with astigmatism ≤ 0.75D.

Sydney, Australia

A retrospective chart review of 400 eyes were conducted at a single private surgery centre in Sydney Australia. Myopic adults with no co-existing ocular morbidity underwent bilateral ray tracing based lasik. Eyes with preoperative subjective cyl ≤0.75D were selected for analysis, subgrouped into ≤0.25D, ≤0.5D and ≤0.75D. Manifest refractive spherical equivalent (MRSE), uncorrected distance visual acuity (UDVA) and corrected distance visual acuity (CDVA) were assessed pre and postoperatively. Astigmatic changes were determined using Alpins vector.

In total, 204 of 400 eyes had ≤0.75D preop cyl. Three months postoperatively, the mean UDVA was -0.14 logMAR and the vector difference between actual and expected astigmatism was 0.24D @ 29. There was no statistically significant difference in efficacy between the preoperative cyl groups. Residual postoperative subjective cyl within ±0.25 D, ±0.50 D and ±1.00 D occurred in 82%, 96% and 100% of cases respectively. Overall, 96% of patients had a postoperative outcome within 0.5D with 11.5% of patient demonstrating a slight overcorrection.

The study demonstrates that ray tracing based lasik offers better outcomes in low astigmatism eyes compared to outcomes reported for standard lasik published in the literature with 96% of patients achieving a postoperative outcome within 0.5D.