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Evaluation of percentage tissue ablated PTA of 2 different cap thicknesses in refractive lenticule extraction smile to keratectasia

Poster Details

First Author: C.Pohl GERMANY

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

Abstract Details


A percentage tissue ablated (PTA) of more than 40% was suggested a negative prognostic factor for keratectasia after LASIK surgery. This quality management investigation addresses the question, whether keratectasia occurred in different PTA in SMILE surgery with a residual cap of 140µm and 130 µm.


Breyer Kaymak Klabe Augenchirurgie Berliner Allee 15 40212 Duesseldorf Germany


So far the results of 400 eyes are evaluated over up to 36 month after SMILE treatment. Calculated PTA was compared to keratectasia development assesed with Scheimpflug tomography, videokeratography and aberrometry readings at each follow up vist over 36 month.


No signs of keratectasia were found in all 400 patients in PTA ranging from 34%-52%.


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 Disclosure:

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

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