Abstract
Purpose :
To investigate the changes in higher-order aberrations (HOAs) after wearing orthokeratology (OK) lenses in myopic patients.
Methods :
The study was carried out by restrospective chart review and included 15 eyes from ten myopic patients, whose refractive error was equal or higher than -4.5 diopters (D). Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA) were measured, and auto-refraction, topography, and Zywave®aberrometry were performed at baseline and 1, 3, and 6 months following OK lens wear.
Results :
The mean age was 11.5years (range: 9–15 years), and the OK lenses were well-tolerated in all subjects. There was a significant improvement in UCVA (P<0.001) and decrease in spherical equivalent measured with auto-refraction at 6 months (P<0.001). Total HOAs significantly increased after OK lens wear (P<0.001), with spherical aberration increasing approximately 3.9-fold (P=0.05). Defocus and 0° astigmatism significantly decreased (P<0.001 and P=0.008, respectively). Vertical coma and quadrafoil significantly increased in the negative direction at 1 month, and then stabilized at 3 months (P=0.01 and P=0.03, respectively). No statistically significant changes were found in 45° astigmatism, horizontal coma, trefoil,and secondary astigmatism.
Conclusions :
After wearing properly prescribed OK lens, all subjects had significantly improved UCVA and decreased myopic spherical equivalent, with increased total HOAs and positive spherical aberration at 1 month, and the changes were maintained at 6 months.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.