AIM:To analyze satisfaction on night vision and its related factors after FS-LASIK in patients with high and low-to-moderate myopia.

METHODS:This was a retrospective study. Totally 75 patients(150 eyes)who underwent FS-LASIK in Xi'an No.1 Hospital from June 2018 to September 2019 were included. All subjects were divided into two groups based on spherical equivalent(SE): high myopia group(SE≥-6.00D)and low-to-moderate myopia group(<-6.00D). Six months after surgery, corneal topography and corneal higher-order aberrations(total HOAs, spherical aberrations, coma and trefoil)under 7mm pupil diameter was investigated by Sirius. Patients were required to complete a questionnaire to evaluate satisfaction and night vision symptoms.

RESULTS:For the high myopia group and low-to-moderate myopia group, preoperative SE was -7.85±1.27D and -4.57±1.01D respectively. There were significant differences in total HOAs, spherical aberrations and coma(all P<0.001)except for the trefoil(P>0.05)between the two groups. Overall satisfaction was 95.3% and 100.0% in high and low-to-moderate myopia group. 18.8% and 9.3% experienced worsen night vision, 51.2% and 40.6% experienced halo, 41.9% and 43.8% experienced starburst, and 18.6% and 15.6% experienced double vision, respectively. Except that there was significant differences in night vision between the two groups(P=0.010), the occurrence of other night vision symptoms were similar and there were no significant differences in any of them(all P>0.05). For all patients, the satisfaction was correlated with preoperative astigmatism and ablation zone(all P<0.05), night vision was correlated with preoperative SE, ablation depth, corneal curvature, total HOAs, spherical aberrations and coma postoperatively(all P<0.05), star burst was correlated with preoperative total HOAs, coma and postoperative trefoil(all P<0.05), double vision was correlated with preoperative astigmatism(P<0.05).

CONCLUSION: High myopic patient experienced worsen night vision mainly because of increased total HOAs, spherical aberration and coma. However, symptoms such as halo, starburst and double vision were similar in both groups and did not affect overall satisfaction.