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Related Experiment Video

Updated: Mar 6, 2026

Ye's Swing Technique for Small-incision Lenticule Extraction Surgery
04:15

Ye's Swing Technique for Small-incision Lenticule Extraction Surgery

Published on: June 27, 2025

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Small Incision Lenticule Extraction (SMILE) for Hyperopia: Optical Zone Centration.

Dan Z Reinstein, Kishore R Pradhan, Glenn I Carp

    Journal of Refractive Surgery (Thorofare, N.J. : 1995)
    |March 7, 2017
    PubMed
    Summary

    Hyperopic small incision lenticule extraction (SMILE) demonstrates excellent optical zone centration, comparable to eye-tracker-centered laser-assisted in situ keratomileusis (LASIK). This refractive surgery technique offers precise outcomes for hyperopic corrections.

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    Area of Science:

    • Ophthalmology
    • Refractive Surgery
    • Corneal Laser Surgery

    Background:

    • Small Incision Lenticule Extraction (SMILE) is an advanced refractive surgical technique.
    • Accurate optical zone centration is crucial for achieving optimal visual outcomes in hyperopic correction.
    • Comparison with established procedures like LASIK is essential for validating new techniques.

    Purpose of the Study:

    • To evaluate the optical zone centration of hyperopic small incision lenticule extraction (SMILE).
    • To compare the centration accuracy of SMILE with that of LASIK for hyperopic corrections.

    Main Methods:

    • Prospective study involving 60 hyperopic SMILE procedures using a femtosecond laser.
    • Matched LASIK control groups (6.5-mm and 7-mm optical zones) were utilized for comparison.
    • Centration was assessed by measuring the offset between the optical zone center and corneal vertex using tangential curvature difference maps and vector analysis.

    Main Results:

    • The mean centration offset for hyperopic SMILE was 0.23 ± 0.15 mm.
    • This was significantly less than the mean centration offset observed in both the 6.5-mm (0.33 ± 0.14 mm) and 7-mm (0.31 ± 0.19 mm) LASIK groups (P < .05).
    • Inclusion criteria focused on hyperopic corrections between +1.00 and +7.00 diopters with astigmatism up to 6.00 D.

    Conclusions:

    • Optical zone centration in hyperopic SMILE is comparable to eye-tracker-centered hyperopic LASIK using the MEL 80 excimer laser.
    • SMILE offers precise optical zone centration for hyperopic corrections.
    • The findings support SMILE as a reliable refractive surgery option for hyperopia.