Clinical outcomes of small incision lenticule extraction in myopia: Study of vector parameters and corneal aberrations

Jay Jiyong Kwak, Ikhyun Jun, Eung Kweon Kim, Kyoung Yul Seo, Tae Im Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Purpose: To investigate clinical outcomes of small incision lenticule extraction (SMILE) including vector parameters and corneal aberrations in myopic patients. Methods: This retrospective, observational case series included 57 eyes (29 patients) that received treatment for myopia using SMILE. Visual acuity measurement, manifest refraction, slit-lamp examination, autokeratometry, corneal topography, and evaluation of corneal wavefront aberration were performed preoperatively and at 1 and 3 months after surgery. We analyzed the safety, efficacy, vector parameters, and corneal aberrations at 3 months after surgery. Results: Preoperatively, mean manifest refraction spherical equivalent refraction was -4.94 ± 1.94 D (range, -8.25 to 0 diopters [D]), and the cylinder was -1.14 ± 0.82 D (range, -3 to 0 D). Mean manifest refraction spherical equivalent improved to -0.10 ± 0.23 D at 3 months postoperatively, when uncorrected distance visual acuity was 20 / 20 or better in 55 (96%) eyes. The linear regression model of target induced astigmatism vector versus surgically induced astigmatism vector exhibited slopes and coefficients (R2) of 0.9618 and 0.9748, respectively (y = 0.9618x + 0.0006, R2 = 0.9748). While total corneal root mean square higher order aberrations, coma and trefoil showed statistically significant increase, spherical aberration did not show statistically significant change after SMILE. Conclusions: SMILE has proven to be effective and safe for correcting myopia and astigmatism. We showed that SMILE did not induce spherical aberrations. A small increase in postoperative corneal higher order aberration may be associated with increase in coma and trefoil.

Original languageEnglish
Pages (from-to)76-84
Number of pages9
JournalKorean journal of ophthalmology : KJO
Issue number1
Publication statusPublished - 2020 Feb

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (NRF-2019R1F1A1062468).

Publisher Copyright:
© 2020 The Korean Ophthalmological Society

All Science Journal Classification (ASJC) codes

  • Ophthalmology


Dive into the research topics of 'Clinical outcomes of small incision lenticule extraction in myopia: Study of vector parameters and corneal aberrations'. Together they form a unique fingerprint.

Cite this