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Purpose.  To investigate the visual quality after SMILE and Femto-LASIK.  Methods.  About 123 eyes from 63 patients were enrolled in this study. The parameters were measured preoperatively and 1 week, 1 month, and 3 months postoperatively using Sirius System.  Results.  The MTF curve increase slightly from low to high frequency at 3 mm and 6 mm pupil diameter after SMILE surgery ( P  < 0.05) during the follow-up time comparing with the preoperative values. And the SR has a significant increase at various pupil diameters as well ( P  < 0.05). However, there was little increase for MTF at intermediate to high frequency at 3 mm pupil diameter after Femto-LASIK procedure ( P  < 0.05). And the SR had only significant increase at 3 mm pupil diameter. Between SMILE and Femto-LASIK, there was no statistic difference both in MTF and SR ( P  > 0.05) at 3 mm pupil diameter at vertical and horizontal meridian. However, significant difference was found in MTF at low to mediate frequency at 6 mm pupil diameter at vertical meridian at 1 week postoperatively ( P  < 0.05).  Conclusions.  Both SMILE and Femto-LASIK show a great improvement in optical quality at small diameter. It was found that SMILE shows better optical quality than Femto-LASIK at larger pupil diameter, which might be good for the night vision.

Comparison of the Optical Quality between Small Incision Lenticule Extraction and Femtosecond Laser LASIK