Evaluation of correlation of percentage tissue ablated (PTA) of two different cap thicknesses in refractive lenticule extraction (ReLEx) SMILE to keratectasia up to three years after surgery

Session Details

Session Title: Femtosecond Small Lenticule Extraction II

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

Paper Time: 18:14

Venue: Room 17

First Author: : D.Breyer GERMANY

Co Author(s): :    D. Breyer   H. Kaymak   K. Klabe   A. Fricke   F. Kretz   G. Auffarth     

Abstract Details

Purpose:

Small incision lenticule extraction (SMILE, VisuMax, Carl Zeiss Meditec) may be less sensitive for late keratectasia due to tissue removal in deeper corneal layers and a small incision of only 2-3mm. A PTA of more than 40% was suggested a negative prognostic factor for keratectasia after LASIK surgery. This quality management investigation evaluated keratectasia development in different PTA during SMILE surgery with a residual cap of 130-140 µm.

Setting:

So far the results of 400 eyes are evaluated over up to 36 month after SMILE treatment. All SMILE treatments were performed at the Breyer-Kaymak-Klabe Augenchirurgie, Duesseldorf., Germany.

Methods:

Calculated PTA was compared to keratectasia development assesed with Scheimpflug tomography, videokeratography and aberrometry readings at each follow up visit over 36 month.

Results:

No signs of keratectasia were found in all 400 patients in PTA ranging from 30% to 50%.

Conclusions:

So far, our results show a low risk for keratectasie development. Still future studies are needed to show wether or not the SMILE technique will push the PTA limit to higher values without the risk of keratectasia.

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, One of the authors travel has been funded, fully or partially, by a competing company, One of the authors travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, One of the authors receives consulting fees, retainer, or contract payments from a competing company