Wavefront-Optimized Femto-LASIK: Evaluating Corneal Higher-Order Aberrations
Purpose
To report the visual outcomes and change in corneal aberration in Indian eyes treated using the FS200 laser (Alcon Laboratories Inc).
Methods
Prospective, observational series included 72 eyes with myopia, myopic astigmatism or pure astigmatism (spherical equivalent -0.75 to -9.37 D), undergoing Wavefront-Optimized Femto-LASIK using the EX500 (Alcon Laboratories Inc) and FS200 lasers. Pre- and 3 month postoperative uncorrected distance visual acuity (UDVA) and higher-order aberrations (HOAs), as measured on the I-Trace aberrometer (Tracey Technologies, USA) were compared.
Results
At 3 months, 89% of eyes had a UDVA of 20/25 or better and 98% had 20/30 or better. All eyes had a postoperative CDVA of 20/25 or better. An increase was found in mean spherical aberration of 0.22+0.27 microns(P=0.01) at a 6 mm pupil. However, when measured at the physiologic mesopic pupil size there was a slight decrease of -0.01+0.03 microns(P=0.19) in mean spherical aberrations. An increase in coma was noted of 0.03+0.05 microns(P=0.004). An increase was found in total higher order aberrations of 0.04 +/- 0.06 microns (P =0.004).
Conclusion
Wavefront-optimized Femto-LASIK with the EX500 and FS200 lasers achieved excellent postoperative UDVA outcomes, with no significant induction of spherical aberration at mesopic pupil size