Comparative study of Refractive and Visual Quality after Wavefront-Optimized FS-LASIK for Angle Kappa Adjustment in Dominant and Nondominant Eyes.

Abstract

This study investigates the differences between dominant and nondominant eyes in FS-LASIK with 50% angle kappa compensation on diopter and visual quality. Setting: University hospital. Design: retrospective clinical study. Methods: A total of 109 patients (218 eyes,100%) with myopia who underwent femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK) were randomly selected. The preoperative pupil size，center position and offset between the coaxially sighted corneal light reflex (P-Dist) of the patients was recorded. In preoperative and postoperative 6 months, an iTrace wavefront aberrometer (Tracey Technologies, Inc.) was used to measure the corneal, internal optics, and total aberrations. Results: The 6 months postoperatively for corneal coma of the dominant eyes were 0.141±0.055 μm and the nondominant eyes were 0.157 ±0.033 μm, which was significantly greater than the dominant eyes (P = 0.028). The postoperative corneal coma aberration changes were positively correlated with preoperative P-Dist, the dominant eyes (r = 0.221, P = 0.023), and the nondominant eyes (r = 0.251, P = 0.009). Conclusions: We suggest adjusting the angle kappa percentage in the nondominant eyes to be higher than that of the dominant eyes in individualized corneal refractive surgery to find the ablation center closest to the visual axis.