Changes of accommodative function in myopias after femtosecond laser-assisted in situ keratomileusis

Objective To investigate the changes of accommodation after femtosecond laser-assisted in situ keratomileusis (FS-LASIK) in myopic patients. Methods A total of 40 myopic patients (80 eyes) treated with FS-LASIK were randomly selected in this study. They were divided into two groups according to preoperative refractive status: 20 cases in moderate myopia group (40 eyes) and 20 cases in high myopia group (40 eyes). Their accommodative function including the accommodative response (AR), amplitude of accommodation(AMP), relative accommodation and accommodative facility were measured before surgery, 1 week and 1 month after surgery. Results In the two groups, the AMP was lower at 1 week after FS-LASIK than that before FS-LASIK (P＜0.05). There was no significant difference between the AMP at 1 month after FS-LASIK and that before FS-LASIK (P＞0.05). There was no significant difference in relative accommodation, accommodation response and binocular accommodative facility between the two groups at 1 week and 1 month after operation (P＞0.05). There were no significant differences in accommodation amplitude, negative relative accommodation (NRA) and positive relative accommodation (PRA), accommodation response and accommodative facility between the two groups at different time points (P＞0.05). Conclusions The amplitude of binocular accommodation will decrease temporarily in the early stage after FS-LASIK, and then will gradually recover. FS-LASIK has no significant adverse effect on binocular accommodation.