ESCRS - PP03.01 - Efficacy And Predictability Of Of Lasik Surgery Using Ray Tracing Technology For Myopic Eyes With High Astigmatism (≥2.0D)

Efficacy And Predictability Of Of Lasik Surgery Using Ray Tracing Technology For Myopic Eyes With High Astigmatism (≥2.0D)

Published 2023 - 41st Congress of the ESCRS

Reference: PP03.01 | DOI: 10.82333/43kq-4670

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

1PersonalEYES,Sydney,Australia, 2PersonalEYES,Sydney,Australia;Macquarie University,Macquarie,Australia, 3PersonalEYES,Sydney,Australia;Sydney University,Sydney,Australia

To compare subjective astigmatism with the astigmatism measured and treated using novel ray tracing based Lasik in patients with ≥2D subjective astigmatism. The congruence and outcomes were examined.

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 ≥2D were selected for analysis. 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 analysis.

Analysis of 30 eyes with ≥2D of astigmatism (51.4% female, mean age 29.2±4.8 years) had preop cyl in categories ≤2.5, 3, 3.5, 4 and 4.5D in 9.1%, 36.4%, 72.7%, 90.9% and 100% respectively. Ray tracing measured preop mean cyl of -3.34D compared to -2.92D subjectively (P>0.05). Three months postoperatively, the mean UDVA was -0.1 logMAR and MRSE was 0.1D. The vector difference between actual and expected astigmatism was 0.2D @ 179. There was no significant difference in efficacy between the preop cyl groups. Residual postoperative subjective cyl measurements in the categories ≤0.25, ≤0.5, ≤0.75 were 55.5%, 94.5%, 100% respectively.

Compared to subjective measurements, ray tracing detects and treats slightly higher amounts of cyl with 94.5% of eyes achieving <0.5D of postoperative cyl. Recovery time to optimal UCVA took longer for eyes with preoperative astigmatism >2D compared to eyes with lower astigmatism.