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wavelight cornea refractive surgery

Csaba Szekrényesi, Gábor László Sándor, Andrea Gyenes, Huba Kiss, Tamás Filkorn, Zoltán Nagy
INTRODUCTION: Thermal conditions during photorefractive keratectomy might be an important issue related to the corneal wound healing and long-term outcomes. AIM: Authors tried to find out the importance of temperature conditions during the treatment. METHOD: One eye of 90 patients has been included into the study. Photorefractive keratoctomy was applied with Carl Zeiss MEL 70, MEL 80 and Wavelight Allegretto excimer lasers. EBRO TLC 730 infrared thermometer was used for the measurement of surface temperature of the cornea before epithelial removal, as well as before and after the treatment...
October 2016: Orvosi Hetilap
Sara Ortiz-Toquero, Guadalupe Rodriguez, Victoria de Juan, Raul Martin
PURPOSE: To determine and compare the repeatability of anterior corneal higher order aberrations (HOAs) using a Placido-based topographer (Allegro Topolyzer; WaveLight Technologie AG, Alcon Laboratories, Erlangen, Germany) in a sample of normal and keratoconic eyes. METHODS: Three repeated measurements of each cornea of normal and keratoconic eyes were taken with the Allegro Topolyzer. Repeatability of the HOAs (3rd- and 4th-order individual values and normalized polar Zernike coefficients, coma-like, root mean square (RMS) up to 8th-order values, HOA RMS, and total RMS for 6-mm pupil diameter) and central corneal power (3-mm pupil) were analyzed...
May 1, 2016: Journal of Refractive Surgery
Christian M Hammer, Corinna Petsch, Jörg Klenke, Katrin Skerl, Friedrich Paulsen, Friedrich E Kruse, Theo Seiler, Johannes Menzel-Severing
PURPOSE: To assess the suitability of a new 345 nm ultraviolet (UV) femtosecond laser for refractive surgery. SETTING: Department of Ophthalmology, University of Erlangen-Nürnberg, Erlangen, Germany. DESIGN: Experimental study. METHODS: Twenty-five porcine corneas were used for stromal flap or lamellar bed creation (stromal depth, 150 μm) and 15 rabbit corneas for lamellar bed creation near the endothelium. Ultraviolet femtosecond laser cutting-line morphology, gas formation, and keratocyte death rate were evaluated using light and electron microscopy and compared with a standard infrared (IR) femtosecond laser...
June 2015: Journal of Cataract and Refractive Surgery
Giacomo Savini, Antonio Calossi, Massimo Camellin, Francesco Carones, Marco Fantozzi, Kenneth J Hoffer
PURPOSE: To evaluate whether the refractive changes induced by excimer laser surgery can be accurately measured by corneal ray tracing performed by a combined rotating Scheimpflug camera-Placido-disk corneal topographer (Sirius). SETTING: Private practices. DESIGN: Evaluation of diagnostic test. METHODS: This multicenter retrospective study comprised patients who had myopic or hyperopic excimer laser refractive surgery...
July 2014: Journal of Cataract and Refractive Surgery
A John Kanellopoulos, George Asimellis
PURPOSE: To compare and correlate central corneal thickness (CCT), anterior chamber depth (ACD), and keratometric (flat and steep K) measurements using two anterior segment imaging methods, a Scheimpflug camera system (Oculyzer II [Oculus Optikgeräte GmbH]) and a partial coherence biometry system (WaveLight OB820 [Alcon Laboratories Inc]) in eyes undergoing cataract surgery. METHODS: Ninety patients (mean age: 66±13 years [range: 32 to 88 years]) underwent preoperative measurement of CCT, ACD, and keratometric measurements by Scheimpflug tomography (Oculyzer II) and optical low coherence reflectometry (WaveLight OB820)...
December 2012: Journal of Refractive Surgery
Tansu Gonen, C Banu Cosar, Bozkurt Sener, Kadircan H Keskinbora
PURPOSE: To compare the keratometric values measured by the automated keratometer, two Placido-based computerized topography systems (Dicon CT 200 [Vismed Inc] and Allegro Topolyzer [WaveLight Inc]), and Scheimpflug analysis (Pentacam [Oculus Optikgeräte GmbH]). METHODS: The keratometric data of 200 eyes from 200 patients evaluated for refractive surgery were reviewed retrospectively. Mean simulated keratometry (Sim K) and mean corneal astigmatism measured by the four devices were compared using repeated measures analysis of variance with Bonferroni correction...
August 2012: Journal of Refractive Surgery
Carlos Dorronsoro, Silvia Schumacher, Pablo Pérez-Merino, Jan Siegel, Michael Mrochen, Susana Marcos
An Allegretto Eye-Q laser platform (Wavelight GmbH, Erlangen, Germany) was used to study the effect of air-flow speed on the ablation of artificial polymer corneas used for testing refractive surgery patterns. Flat samples of two materials (PMMA and Filofocon A) were ablated at four different air flow conditions. The shape and profile of the ablated surfaces were measured with a precise non-contact optical surface profilometer. Significant asymmetries in the measured profiles were found when the ablation was performed with the clinical air aspiration system, and also without air flow...
February 28, 2011: Optics Express
C Winkler von Mohrenfels, J P Salgado, R Khoramnia, C Wüllner, C Donitzky, M M Maier, C Lohmann
PURPOSE: The aim of this study was to evaluate the safety, stability and efficacy of Epi-LASIK with a 1000 hertz excimer laser system. METHODS: 40 eyes of 23 patients underwent an Epi-LASIK procedure using the Gebauer EpiLift and the WaveLight Concept System 1000. Preoperatively as well as 1 month, and 3 months postoperatively, a complete ophthalmic examination, including objective and subjective refraction (UCVA, BCVA) and topography, was performed. RESULTS: The mean preoperative spherical equivalent (SE) was -4...
July 2011: Klinische Monatsblätter Für Augenheilkunde
Michael Mrochen, Christian Wüllner, Johannes Krause, Mario Klafke, Christof Donitzky, Theo Seiler
PURPOSE: To demonstrate the feasibility and technical features of the WaveLight FS200 femtosecond laser (WaveLight GmbH) in refractive and corneal laser surgery. METHODS: The reproducibility of femtosecond laser-created flap dimensions and channels used for corneal ring segment implantation were measured by means of an optical coherence tomography system in porcine corneas. The increase in the intraocular pressure (IOP) during applanation with the corneal interface was measured by means of an IOP sensor...
October 2010: Journal of Refractive Surgery
Michael Mrochen, Christian Wuellner, Kristin Rose, Christof Donitzky
PURPOSE: To evaluate the feasibility of surface profiling for central ablation depth measurements and determine experimentally the required single-pulse energies and radiant exposures to achieve equivalent central ablation depths on bovine corneas for a myopic correction of -6.00 diopters (optical zone 6.5 mm) performed with laser repetition rates ranging from 100 to 1050 Hz. SETTING: Institute for Refractive and Ophthalmic Surgery, Zurich, Switzerland, and WaveLight AG, Erlangen, Germany...
October 2009: Journal of Cataract and Refractive Surgery
Carlos Dorronsoro, Laura Remon, Jesús Merayo-Lloves, Susana Marcos
A new experimental model based on plastic (Filofocon A) artificial eyes was used to study the ablation profiles and the outcomes of three state-of-the-art refractive surgery excimer lasers provided with narrow-beam flying spot and optimized algorithms (Ladarvision 4000, Alcon; Technolas 217 Z100, Bausch and Lomb; Allegretto wave Eye-Q, Wavelight). The 3-D ablation patterns produced by myopic laser corrections (-9, -6 and -3 D) on flat and spherical surfaces of Filofocon A were measured using high resolution optical profilometry...
August 17, 2009: Optics Express
Seyyed Mohammad Ghoreishi, Afsaneh Naderibeni, Alireza Peyman, Akram Rismanchian, Fatemeh Eslami
PURPOSE: To compare the results of photorefractive keratectomy (PRK) with Q-factor customized aspheric ablation and wavefront-guided customized ablation for correction of myopia compound with astigmatism. METHODS: Fifty-six patients were enrolled in this prospective controlled study. In each patient, one eye was randomly assigned for treatment with the Q-factor customized PRK (custom-Q study group) and the other eye treated with wavefront-guided customized PRK. Preoperative and 3-month postoperative manifest refraction, contrast sensitivity, visual acuity, aberrometry, and asphericity of the cornea were compared between the two groups...
July 2009: European Journal of Ophthalmology
Michael Mrochen, Urs Schelling, Christian Wuellner, Christof Donitzky
PURPOSE: To investigate the influence of temporal and spatial spot sequences on the ocular surface temperature increase during corneal laser surgery with a high-repetition-rate excimer laser. SETTING: Institute for Refractive and Ophthalmic Surgery, Zurich, Switzerland, and WaveLight AG, Erlangen, Germany. METHODS: An argon-fluoride excimer laser system working at a repetition rate of 1050 Hz was used to photoablate bovine corneas with various myopic, hyperopic, and phototherapeutic ablation profiles...
April 2009: Journal of Cataract and Refractive Surgery
Michael Mrochen, Urs Schelling, Christian Wuellner, Christof Donitzky
PURPOSE: To investigate the effect of temporal and spatial distributions of laser spots (scan sequences) on the corneal surface quality after ablation and the maximum ablation of a given refractive correction after photoablation with a high-repetition-rate scanning-spot laser. SETTING: IROC AG, Zurich, Switzerland, and WaveLight AG, Erlangen, Germany. METHODS: Bovine corneas and poly(methyl methacrylate) (PMMA) plates were photoablated using a 1050 Hz excimer laser prototype for corneal laser surgery...
February 2009: Journal of Cataract and Refractive Surgery
George D Kymionis, Vasilios F Diakonis, George Kounis, Dimitrios I Bouzoukis, Eirineos Gkenos, Harilaos Ginis, Sonia H Yoo, Ioannis G Pallikaris
PURPOSE: To compare the refractive outcomes after photorefractive keratectomy (PRK) for low to moderate myopic corrections using 2 excimer lasers with different repetition rates (200 Hz and 400 Hz). SETTING: University refractive surgery center. METHODS: This retrospective study included all consecutive patients who underwent PRK using the 200 Hz or the 400 Hz Allegretto laser platform (WaveLight Laser Technologie AG). Thirty-five patients (70 eyes) and 29 patients (58 eyes) had PRK with the 200 Hz platform and the 400 Hz platform, respectively, using the same surgical technique...
June 2008: Journal of Cataract and Refractive Surgery
Perry S Binder, Joseph Rosenshein
PURPOSE: To compare 3 excimer laser platforms for the correction of myopic spheres and myopic spherocylinders using conventional algorithms or wavefront-guided treatments. SETTING: Private practice, in-office laser facility. METHODS: This retrospective comparative interventional case series comprised 458 patients (721 eyes). Sequentially selected patient eyes had laser in situ keratomileusis surgery by the same surgeon using 1 of 3 lasers (Visx Star S4, LADARVision 4000, WaveLight Allegretto) with a conventional algorithm or with wavefront-guided software...
July 2007: Journal of Cataract and Refractive Surgery
Tobias Koller, Hans Peter Iseli, Farhad Hafezi, Michael Mrochen, Theo Seiler
PURPOSE: To compare the results of the Q-factor customized aspheric ablation profile with the wavefront-guided customized ablation pattern for the correction of myopic astigmatism. SETTING: Institute for Refractive and Ophthalmic Surgery, Zurich, Switzerland. METHODS: Thirty-five patients were enrolled in a controlled study in which the nondominant eye was treated with the Q-factor customized profile (custom-Q study group) and the dominant eye was treated with wavefront-guided customized ablation (control group)...
April 2006: Journal of Cataract and Refractive Surgery
Igor Kaiserman, Rossen Hazarbassanov, David Varssano, Aharon Grinbaum
PURPOSE: To compare the effects on contrast sensitivity of wave front-guided (WFG) versus standard LASIK. DESIGN: Prospective, nonrandomized, comparative clinical study. PARTICIPANTS: Twenty-four eyes of 13 consecutive patients (mean age, 25.2+/-8.4 years; spherical equivalent, -0.5 to -4.25 diopters [D]) treated with WFG LASIK (WaveLight-Allegretto scanning-spot laser and wave front analyzer) and 22 eyes of 12 consecutive patients (mean age, 28...
March 2004: Ophthalmology
Michael Mrochen, Ronald R Krueger, Michael Bueeler, Theo Seiler
PURPOSE: To clarify the feasibility of aberration-sensing and wavefront-guided laser in situ keratomileusis (LASIK) to manage grossly decentered ablation and to discuss the limitations of the technology. METHODS: Three patients with previous decentrations of the ablation zone between 1.5 to 2.0 mm were scheduled for wavefront-guided LASIK. All patients reported monocular diplopia and halos. Wavefront aberrations were measured with a Tscherning-type aberrometer. Laser ablation was done with a WaveLight Allegretto in a one-step procedure with ablation profiles calculated only from the individual wavefront map...
July 2002: Journal of Refractive Surgery
M Mrochen, M Kaemmerer, T Seiler
PURPOSE: Wavefront optical aberrations induced by refractive corneal surgery correction of myopia are probably the reason for deterioration of visual performance in some eyes after surgery. Customized photoablation of the cornea to correct both the sphero-cylindrical refractive error as well as individual optical aberrations may improve postoperative visual acuity and visual performance. METHODS: In 3 eyes of 3 patients the wavefront deviations were measured by means of an aberrometer of the Tscherning-type...
March 2000: Journal of Refractive Surgery
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