Comparison of the optical quality after SMILE and FS-LASIK for high myopia by OQAS and iTrace analyzer: a one-year retrospective study

Abstract

Background To compare the correction effect and optical quality after small-incision lenticule extraction (SMILE) and femtosecond laser assisted laser in situ keratomileusis (FS-LASIK) for high myopia. Methods 51 high myopia eyes after SMILE and 49 high myopia eyes after FS-LASIK were enrolled and divided into two groups retrospectively. The OQAS and iTrace analyzer were used for optical quality inspection. Between the two groups the spherical equivalent (SE), astigmatism, uncorrected distant visual acuity (UDVA), strehl ratio (SR), modulation transfer function cutoff frequency (MTF cutoff), objective scatter index (OSI) and wavefront aberrations were analyzed and compared before surgery and at 1, 6 and 12 months after surgery. Results After the operation: (1) SE and astigmatism declined and UDVA increased significantly in both groups, and UDVA was better after SMILE than FS-LASIK. (2) SR and MTF cutoff reduced and OSI increased significantly after SMILE and FS-LASIK. SR and MTF cutoff were significantly higher after SMILE than FS-LASIK. OSI was significantly lower after SMILE than FS-LASIK. (3) The total wavefront aberration, total low-order wavefront aberration, defocus and astigmatism aberration as well as trefoil aberration reduced significantly in both groups. The total high-order wavefront aberration increased significantly after FS-LASIK. The spherical and coma aberration increased significantly in both groups. The total high-order wavefront aberration and coma aberration at 1 month were higher after FS-LASIK than SMILE. Conclusion The optical quality descended after SMILE and FS-LASIK. SMILE was superior to FS-LASIK at the correction effect and optical quality for high myopia. The combination of OQAS and iTrace analyzer is a valuable complementary measurement in evaluating the optical quality after the refractive surgery. Trial registration This is a retrospective study. This research was approved by the ethics committee of Xiangya Hospital and the IRB approval number is 201612074.

Implantable collamer lens versus small incision lenticule extraction for high myopia correction: A systematic review and meta-analysis

“…Nowadays, it is well accepted to use small incision lenticule extraction (SMILE) to correct low-to-moderate myopia [ 1 , 2 ]. For high myopia correction, SMILE also brought satisfying prognosis [ 3 , 4 ], however, SMILE has its inherent limitations such as thick ablation depths, limited ablation zones and increased aberrations, SMILE could increase the risk of dry eye [ 5 ], myopic regression [ 6 ], haze [ 7 ] and corneal ectasia [ 8 ].…”

Comparison of Corneal Optical Quality After SMILE, Wavefront-Optimized LASIK and Topography-Guided LASIK for Myopia and Myopic Astigmatism

“…In the present study, however, RMS of coma was comparably low in the TCAT group, but the difference wasn’t statistically significant. On the contrary, Yin Y et al found lower coma aberration at 1 month after SMILE than FS-LASIK, which may be due to high myopic correction and iTrace analyzer measurement ( 24 ). Some studies also found lower corneal SA after SMILE compared to FS-LASIK ( 13 – 15 ).…”

Analysis of the Effectiveness of SMILE, FS‐LASIK, and SBK in Myopic Patients and the Impact in UCVA and Tear Film Stability

“…e results showed that the UCVA values of the three groups before surgery, 2 weeks after surgery, 1 month after surgery and 3 months after surgery were similar (P > 0.05), suggesting that these three surgical treatment methods could effectively improve the incorrected visual acuity of myopic patients and improve the symptoms of distance vision loss. e reasons for this may be as follows: all three procedures, SMILE, FS-LASIK, and SBK, were corneal refractive surgeries based on laser technology, and with laser technical support, these three procedures had the advantages of short treatment time (the required pulse can be obtained in a very short time), small focusing space, high accuracy, and little damage to surrounding tissues and organs [10]. e cornea has the effect of providing most of the refractive power for the eye.…”