Changes spatial contrast sensitivity of the eye after refractive surgery in patients with myopia low and moderate degree

Aim. The aim of the study is to compare changes in contrast sensitivity in patients with mild to moderate myopia after keratorefractive interventions using the SMILE, FemtoLASIK and PRK techniques. Material and methods. The SMILE group consisted of 36 eyes with spherical refraction -3,6±1,6 dpt, the FemtoLASIK group consisted of 34 eyes with spherical refraction -3,4±1,5 dptr and the PRK group of 36 eyes with spherical refraction -3,6±1,5 dptr. The Zebra visocontrastometry program, version 3.02 (Astroinform SPE, Russia), was used to investigate spatial contrast sensitivity (CS). The study was performed before and 1 month after keratorefractive intervention. Results. Analysis of the comparison between the preoperative CS level and the 1 month after keratorefractive intervention in SMILE group patients revealed a statistically significant CS decrease at high frequencies in the range 11,3 cycle/deg (р = 0,01) and 16 cycle/deg (р = 0,005), in PRK group patients revealed a statistically significant CS decrease at high frequencies in the range 11,3 cycle/deg (р = 0,003), 16 cycle/deg (р = 0,002). In the FemtoLASIK group changes in spatial CS were not statistically significant (p>0.05). Conclusion. FemtoLASIK allows us to preserve eye contrast sensitivity, i.e. does not lead to its significant decrease.