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Comparison of optical zone centration between SMILE and LASIK

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Session Details

Session Title: Femtosecond Small Lenticule Extraction II

Session Date/Time: Tuesday 08/09/2015 | 16:30-18:30

Paper Time: 17:22

Venue: Room 17

First Author: : L.Gobbe FRANCE

Co Author(s): :    M. Gobbe   D. Reinstein   G. Carp   T. Archer           

Abstract Details


To compare the optical zone centration between myopic eyes treated with small incision lenticule extraction (SMILE) and LASIK.


London Vision Clinic, London, UK


Retrospective analysis of 100 SMILE eyes using the VisuMax and a matched group of 100 LASIK eyes using the VisuMax and MEL 90. In SMILE, the patient auto-centrates the treatment on the visual axis by fixating on a fixation light. In LASIK, treatments were centered on the coaxially sighted corneal light reflex. Inclusion criteria were spherical equivalent refraction up to -10.00D, CDVA ≤20/25 and 3 month Atlas topography data available. A grid and set of concentric circles were superimposed on the tangential curvature difference map to measure the optical zone center relative to the corneal vertex.


Mean centration offset was 0.20±0.11 mm for SMILE and 0.17±0.10 mm for LASIK, with no statistically significant difference between groups (p<0.01). In the SMILE group, the optical zone was centered within 0.1-mm of the corneal vertex in 17%, within 0.2-mm in 55%, within 0.3-mm in 81%, and within 0.4-mm in 96% of eyes. In the LASIK group, the optical zone was centered within 0.1-mm of the corneal vertex in 24%, within 0.2-mm in 62%, within 0.3-mm in 92%, and within 0.4-mm in 98% of eyes. There was no systematic directional decentration in either group.


Although no eye tracker was used during the SMILE procedure, the optical zone was equally well centered compared with LASIK.

Financial Interest:

One of the authors receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented

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