Comparison of optical zone centration between SMILE and LASIK

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

Purpose:

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

Setting:

London Vision Clinic, London, UK

Methods:

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.

Results:

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.

Conclusions:

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