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10 - 12 February 2017, MECC Maastricht,The Netherlands.

This Meeting has been awarded 15 CME credits.

LASIK-induced corneal aberrations measured with a point-source colour light-emitting diode (LED) topographer

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Session Details

Session Title: Refractive
Session Date/Time: Friday 10/02/2017 | 10:30-12:30
Paper Time: 10:36
Venue: Brussels Room 0.4

First Author: M. Morral SPAIN
Co Author(s): D. Elies  F. Manero   J. Guell           

Abstract Details


To evaluate induced corneal aberrations after myopic LASIK performed with the MEL 90 excimer laser (Carl Zeiss Meditec AG, Jena, Germany) and the Triple-A profile with a 500-Hz pulse rate, using a point-source color light-emitting diode (LED) topogapher (Cassini, iOptics, Ophtec B.V., Groningen, The Netherlands).


Instituto de Microcirugia Ocular, Barcelona, Spain


Prospective, consecutive study including patients undergoing myopic LASIK with the VisuMax femtosecond laser (Carl Zeiss Meditec AG, Jena, Germany)ᅠand the Triple-A profile of the MEL 90. Flap thickness was between 90-100 microns and optical zone was between 6.5 and 6.7 mm. Corneal aberrations up to the 4th order were measured using the Cassini color-LED topographer before and 3 months after surgery. Mean change in corneal aberrations was calculated. Standard outcomes analysis was also performed. A p value < 0.05 was considered statistically significant (paired Student t test).


Forty eyes of 20 patients were evaluated. Preoperatively, mean spherical equivalent (SEQ) was -4.06 ᄆ 1.53 D and mean cylinder was -0.78 ᄆ 0.56 D. Postoperative SEQ and cylinder were ᄆ 0.50 D in 100% of eyes. Postoperative uncorrected distance visual acuity was 20/20 in 93.75% of eyes. None of the eyes lost any line of corrected distance visual acuity. Mean change of 3rd and 4th order corneal aberrations was as follows: Z(-4,0) 0.085ᄆ0.253(P=0.004); Z(3,-1) 0.124ᄆ0.392(P=0.042); Z(-3,1) 0.020ᄆ0.171(p=0.570); Z(3,-3) -0.024ᄆ0.321(p=0.7536); Z(3,3) 0.010ᄆ0.070(p=153); Z(4,-4) 0.001ᄆ0.046(p=0.910); Z(4,-2) 0.014ᄆ0.044(p=0.449); Z(-4,2) -0.015ᄆ0.266(p=0.993); and Z(-4,4) 0.037ᄆ0.156(p=0.732).


The MEL 90 excimer laser using the Triple-A ablation profile with a 500-Hz pulse rate was found to achieve a high efficacy and safety for myopia up to -8.00 D and cylinder up to 2.00 D. The Cassini color-LED topographer demonstrated a statistically significant increase of spherical aberration (Z(-4,0)) and vertical coma (Z(3,-1)), but below tolerable levels. None of the patients described clinically significant visual disturbances.

Financial Disclosure:

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

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