Impact of different cap thicknesses and PTA values on visual outcomes one year after refractive lenticule extraction (ReLEx) SMILE compared to Femto-LASIK

Session Details

Session Title: Refractive
Session Date/Time: Sunday 28/02/2016 | 08:30-11:00
Paper Time: 10:18
Venue: Skalkotas
First Author: : D.Breyer GERMANY
Co Author(s): :    H. Kaymak   K. Klabe   P. Hagen   F. Kretz   G. Auffarth  

Abstract Details

Purpose:

Former studies showed comparable visual recovery as well as visual and aberrometric results for the ReLEx smile and the Femto-LASIK technique. This retrospective quality management investigation addresses the question whether this also holds for increased cap thicknesses and PTA values.

Setting:

All ReLEx smile (VisuMax, CZM) and Femto-LASIK (Mel 80, CZM) surgeries were performed at the Breyer-Kaymak-Klabe Eyesurgery in Duesseldorf, Germany, which is part of the International Vision Correcton Research Center (IVCRC.net).

Methods:

In case of different cap thicknesses, we compared the visual outcomes of 4 groups; 120, 130 and 180 eyes with cap thicknesses of 150µm, 140µm and 130µm, respectively and 80 eyes with a 100µm flap. Furthermore we analyzed the impact of high PTA-values (Percent Tissue Altered) by comparing the results of 2 ReLEx smile groups; 350 eyes with PTA<40% and 350 eyes with PTA>40%. Follow up was performed between 1 day and up to 36 month postoperatively. Results were evaluated in terms of visual acuity, subjective refraction and wave front analysis (KR-1W Topcon).

Results:

We could not detect significant differences between the 4 cap thickness groups in terms of safety, predictability and visual recovery. All groups showed a mean UDVA of <0.05 LogMAR one year after treatment. Less dry eyes as well as better patient comfort and less pain sensation were observed in the smile groups. Furthermore, no signs of keratectasia were found in the two PTA-groups, whereby overall PTA ranged from 29% to 53%.

Conclusions:

Visual results were similar in all groups, while deficits in comfort were greater for Femto-LASIK. For ReLEx smile our results do not provide evidence for keratectasia development for cap thicknesses of 150µm and PTA values above 40%.

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