Higher Order Aberrations In Lasik Surgery Using Ray Tracing Technology
Published 2023 - 41st Congress of the ESCRS
Reference: PP09.12 | Type: Free paper | DOI: 10.82333/7bc1-aj93
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
Purpose
To determine the impact and effect of ray tracing laser-assisted in situ keratomileusis (LASIK) treatment on higher order aberrations (HOA).
Setting
Sydney, Australia
Methods
A retrospective, chart review of adult patients undergoing ray tracing based LASIK surgery for myopia was undertaken at a single centre in Sydney Australia. Inclusion criteria included myopic adults aged ≥18 years who underwent bilateral ray tracing based laser surgery with no co-existing ocular conditions or previous ocular surgery. All eyes were targeted for emmetropia and measurements of mean HOA root mean square (RMSh) and root mean square 3-6 (RMS3 - RMS6) were conducted preoperatively (preop) and at month 3. We report results on 400 eyes at 3 months.
Results
Patients had preop myopia of -8.25 to -0.25D and astigmatism ≤-4.25D. At the 5.5mm optical zone, our population had preop HOAs RMS3(0.175±0.07μm),
RMS4(0.12±0.06 μm), RMS5 (0.02±0.01μm), RMS6(0.02±0.01μm) and RMSh (0.22±0.07μm). There was a statistically significant increase in postoperative RMS3(0.23±0.12μm), RMS4(0.13±0.06μm), RMS5(0.05±0.02μm), RMS6 (0.04±0.02μm) and RMSh(0.28±0.11μm) (p<0.05) although not clinically significant (defined as change between -0.1μm and 0.1μm inclusive). Spherical aberration decreased significantly from 0.06±0.09 to 0.02±0.10μm, while there was no significant difference in HOA between postoperative UCVA groups of 20/10 to 20/20 with a trend of 0.27 to 0.3μm.
Conclusions
This study shows that ray tracing based LASIK surgery leads to non-clinical significant postoperative HOAs that otherwise can lead to visual side effects. It can also be performed in patients with lower HOAs compared to previous suggestions that customized ablations may only be beneficial in eyes with RMSh>0.3μm.