Official ESCRS | European Society of Cataract & Refractive Surgeons

Evaluation of changes in human corneas after femtosecond laser-assisted LASIK and small-incision lenticule extraction (SMILE) using non-contact tonometry and ultra-high-speed camera (Corvis ST)

Session Details

Session Title: Cornea
Session Date/Time: Sunday 22/02/2015 | 08:30-11:00
Paper Time: 10:09
Venue: Hall 2
First Author: : D.Kook GERMANY
Co Author(s): :    R. Wiltfang   M. Bechmann   W. Mayer   A. Kampik   S. Mir Mohi Sefat  

Abstract Details


To evaluate biomechanical stability and deformability of human corneas before and after femtosecond laser-assisted LASIK (FS-LASIK) and small incision lenticule extraction (SMILE)


Smile Eyes Private Eye Clinic, Munich, Germany Department of Ophthalmology, Ludwig-Maximilians University, Munich, Germany


In a prospective, comparative, non-randomized consecutive case series patients with moderate to high myopia and/or astigmatism underwent corneal refractive surgery. Patients either received standard FS-LASIK or SMILE. Preoperatively and up to three months postoperatively data were analyzed including tomography with Pentacam HR, Goldmann tonometry and non-contact tonometry and deformability of the cornea using an ultra-high-speed camera (Corvis ST). Data were analyzed and P<.05 was considered as statistically significant (t-test).


Seventy-three patients (128 eyes) were treated. Forty-eight eyes of 29 patients underwent FS-LASIK and 80 eyes of 44 patients underwent SMILE. Preoperative spherical equivalent (SE) was -3.23 ± 1.64 D (FS-LASIK group) and -4.83 ± 1.63 D (SMILE group). Almost all parameters generated by Corvis ST between preoperative to postoperative measurements showed significant changes after refractive surgery. Significant changes were seen between both groups postoperatively. Matched pair subgroup analysis of eyes with initially equal pachymetry, intraocular pressure, SE and difference of pre- to postoperative pachymetry, showed no significant changes in parameters measured with Corvis ST.


Corneal biomechanical parameters measured preoperatively with Corvis ST showed significant differences postoperatively in total and in both groups. In subgroup analysis with homogenous eyes FS-LASIK showed no significant changes in biomechanical data measured with Corvis ST compared to SMILE.

Financial Disclosure:


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