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A study of corneal biomechanical properties of LASIK with microkeratome vs femtosecond vs PRK two years after the procedure

Session Details

Session Title: LASIK

Session Date/Time: Wednesday 09/10/2013 | 08:00-10:30

Paper Time: 10:18

Venue: Auditorium (First Floor)

First Author: : J.Palomino SPAIN

Co Author(s): :    A. Castillo   J. Cristobal   M. del Buey   D. Carmona     

Abstract Details


To analyze the long term biomechanical results of the procedure by devising a formula which could render biomechanical results counting on data available prior to surgery.


Universitary Quiron Hostital of Madrid. C/ Diego de Velazquez, 1. 28023 Madrid. Spain


50 PRK cases were analyzed in which de-epithelization was made with 20% alcohol and a 15 second treatment with 0.02% mitomycin at the end of the surgical treatment. 50 LASIK cases with flap created with Intralase Femtosecond( Intralase Corp. California. USA), and 110 micron flaps. And last, we analyzed 50 eyes with flaps created with a Zyoptics XP (B&L Rochester, NY. EEUU) mechanical microkeratome with flaps between 100 and 120 microns. All eyes were analyzed with an Ocular Response Analyser(ORA)(Reichert. Depew, NY. USA) in terms of corneal biomechanical properties before surgery and 2 years later. A statistical study was performed and regression formulae were analyzed in order to reach the biomechanical solution counting on previous data.


Better biomechanical properties are obtained with PRK but without statistically significant differences with regards femtosecond-created flaps; nevertheless, statistically significant differences were found between these two groups and the lasik with flap created with a mechanical microkeratome. We generated formulae capable of finding out the biomechanical characteristics of corneas prior to surgery rendering accurate results in above 80% of cases.


Regarding biomechanical properties: 1.- They are better preserved after surface surgery. 2.- For LASIK and in biomechanical terms it is better to make the flap with a femtosecond. 3.- Regression formulae may be designed to anticipate the biomechanical condition of corneas after surgery.

Financial Interest:

... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, ... receives consulting fees, retainer, or contract payments from a competing company

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