Copenhagen 2016 Registration Programme Exhibitor Information Virtual Exhibition Satellite Meetings Glaucoma Day 2016 Hotel Star Alliance

10 - 14 Sept. 2016, Bella Center, Copenhagen, Denmark

This Meeting has been awarded 27 CME credits


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Corneal biomechanical evaluation in SMILE and LASIK using the ocular response analyser and the CorVis machines

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Session Details

Session Title: Presented Poster Session: Femtosecond-Assisted Refractive Surgery

Session Date/Time: Saturday 10/09/2016 | 09:30-11:00

Paper Time: 10:10

Venue: Poster Village: Pod 2

First Author: : I.Osman EGYPT

Co Author(s): :    H. Helali   A. Elmassry   M. Abdalla        

Abstract Details


To compare the biomechanical changes induced by two corneal refractive procedures namely the femtosecond SMILE and Microkeratome-Flaped LASIK using two machines; the ORA and the CorVis.


Roayah Vision Correction Center, Alexandria, Egypt


Retrospective comparative study of human eyes Fifty eyes equally divided into two groups; Group I included eyes that underwent SMILE procedures using VisuMax® 500 kHz laser system (Carl Zeiss Meditec, Jena, Germany) and Group II included eyes that underwent LASIK procedures using the EX500 Allegretto excimer laser platform (WaveLight GmbH, Erlangen, Germany). The Ocular Response Analyser (ORA) and the CorVis (CST) measured the corneal biomechanical changes before and after surgeries.


ORA showed significant decrease of CH and CRF in both groups . IOP difference was not significant with both machines. A significant postoperative reduction in A2 and HC times, A1 and A2 lengths and HC radius of curvature in both groups and in A1 time in group II only. Deflection amplitude and HC peak distances increased significantly in both groups. Percentage of change (POC)CH and CRF were significantly lower in group II. Mean (POC) in HC radius of curvature was significantly higher in group I while mean (POC) HC peak distance and deflection amplitude were significantly higher in group II . Mean percentage of change of deflection amplitude was nearly five times higher in group II than group I.


Both LASIK and SMILE substantially decreased the corneal biomechanical properties with greater reduction in the LASIK group.

Financial Disclosure:

One or more 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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