Ray-tracing–Guided or Q-Value–Adjusted FS-LASIK for Correction of Myopia and Myopic Astigmatism: A Comparative Contralateral Eye Study

PURPOSE: To compare the safety and efficacy of individualized ray-tracing-guided femtosecond laser-assisted in situ keratomileusis (FS-LASIK) for correction of myopia and myopic astigmatism. METHODS: This prospective, randomized, double-blind, contralateral eye study included 68 eyes of 34 patients with myopia or myopic astigmatism requiring FS-LASIK treatment. For each patient, one eye was randomly assigned to receive the ray-tracing-guided treatment, whereas the contralateral eye underwent Q-value-adjusted ablation. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction spherical equivalent (MRSE), sphere, cylinder, effective optical zone (EOZ), and 6-mm corneal aberrations were measured and analyzed before operation and after a 3-month postoperative follow-up. RESULTS: < .001), respectively. CONCLUSIONS: .