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Vienna 2018 Delegate Registration Programme Exhibition Virtual Exhibition Satellites 2018 Survey


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Comparative outcomes of small incision lenticule extraction and femto LASIK treatments

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Session Details

Session Title: Presented Poster Session: Refractive Surgery New Techniques/Instrumentation/Devices I

Venue: Poster Village: Pod 2

First Author: : A.Hamid UK

Co Author(s): :    S. Vaswani   J. Dermott   A. Hartwig   R. Morris   A. Shortt   C. O'Donnell        

Abstract Details


To report comparative visual acuity, refraction and aberrometry data between groups treated with either Small Incision Lenticule Extraction (SMILE) or Femto-LASIK.


Optegra Eye Hospital London, UK


The study population consisted of; SMILE N=56 eyes (28 patients), Femto-LASIK N=48 eyes (24 patients), matched for pre-op prescription. All treatments were bilateral and targeted for emmetropia. Patients underwent either SMILE using a Zeiss Visumax Laser or Femto-LASIK on the same laser and Zeiss MEL 90 Excimer laser (Carl Zeiss Meditec, Germany). Unaided distance and near visual acuity (UDVA, DCNVA) and spherical equivalent refraction were evaluated for all eyes. Pre- and post-operative RMS values of higher order aberrations were evaluated over a 6mm zone for right eyes only.


The unaided binocular distance vision results showed that 96% and 100% of the Femto-LASIK and SMILE groups respectively achieved 6/6 or better by the one month stage, and 92% (LASIK) and 95% (SMILE) achieved 6/6 or better monocular UDVA. There were no significant differences between pre- and post-op visual acuities or spherical equivalent refraction between the groups (p>0.05). Spherical aberration changes were significantly different between SMILE and LASIK procedures (SMILE 0.01microns, LASIK 0.11 microns, p = 0.001). Differences between SMILE and LASIK changes in total HOA RMS were not significant (SMILE 0.18microns, LASIK 0.14microns, p = 0.416).


This study demonstrated good results with induced change in spherical aberration values being significantly reduced in SMILE treatments compared with Femto-LASIK. No significant differences were evident between the treatments in terms of post-operative refraction and unaided monocular visual acuity. Further research is however required to better understand the impact of SMILE on aberration profiles and visual outcomes.

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