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wavelight cornea

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
I M Kornilovsky, A I Sultanova, A A Burtsev
UNLABELLED: Photorefractive ablation is inevitably accompanied by oxidative stress of the cornea and weakening of its biomechanical and photoprotective properties. AIM: To validate the expediency of riboflavin use in photorefractive ablation for photoprotection of the cornea and cross-linking. MATERIAL AND METHODS: The effects of riboflavin use in photorefractive ablation was first studied in a series of in vitro and in vivo experiments performed on 56 eyes of 28 rabbits, and then on 232 eyes of 142 patients with different degrees of myopia...
May 2016: Vestnik Oftalmologii
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
Anastasios John Kanellopoulos, George Asimellis, Stella Georgiadou
PURPOSE: To compare postoperative changes in apparent photopic and mesopic pupil size and centration in relation to cornea reflection landmarks after cataract surgery. SETTING: Clinical and Research Eye Institute, Athens, Greece. DESIGN: Prospective consecutive case study. METHODS: Pupils were imaged for pupil size and corneal vertex location before and 1-month after cataract surgery. Digital analysis of pupil images was used to determine the Cartesian coordinates (nasal-temporal, horizontal axis, superior-inferior, vertical axis) of the first Purkinje reflection point (approximating the corneal intersection of the visual axis [corneal vertex]) to the pupil geometric center (approximating the corneal intersection of the line of sight [corneal apex])...
February 2015: Journal of Cataract and Refractive Surgery
Hassan Hashemi, Ebrahim Jafarzadehpur, Soraya Ghaderi, Abbasali Yekta, Hadi Ostadimoghaddam, Reza Norouzirad, Mehdi Khabazkhoob
PURPOSE: To determine the distribution of ocular biometric components and their correlation with age and sex during the ages of ocular development in a 6- to 18-year-old population in Iran. METHOD: In this cross-sectional study, which was performed in October 2012, multi-stage stratified cluster sampling was used to sample the study population from Dezful schools, a city in the southwest of Iran. Biometric examinations were done by an experienced optometrist using the LENSTAR/BioGraph (WaveLight AG, Erlangen, Germany)...
February 2015: Acta Ophthalmologica
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
Karolinne Maia Rocha, Ronald R Krueger
PURPOSE: To evaluate the change of epithelial and flap thickness after femtosecond laser-assisted in situ keratomileusis (LASIK) using spectral-domain optical coherence tomography (SD OCT) in correlation with the spherical equivalent refraction treated and clinical outcomes. DESIGN: Prospective, randomized, contralateral-eye study. METHODS: Forty myopic eyes underwent LASIK using an excimer laser with refraction ranging from -1.00 to -7.25 diopters (mean -3...
August 2014: American Journal of Ophthalmology
Jing-cai Lian, Shi-sheng Zhang, Jing Zhang, Sheng Ye
OBJECTIVE: To determine flap thickness variation in 110 µm thickness flap made by FS200 femtosecond laser and sub-Bowman keratomileusis (SBK) microkeratome for studying the potential factors that affect the flap thickness. METHODS: It was a case-control study. Sixty patients were divided into two groups for laser in situ keratomileusis. The corneal flaps were made by using Alcon Wavelight FS200 femtosecond laser or MORIA SBK microkeratome. Central corneal flap thickness was calculated by subtraction pachymetry...
April 2013: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
Esmeralda Costa, Nuno Franqueira, Andreia M Rosa, Cristina Tavares, Maria J Quadrado, Conceição Lobo, Joaquim N Murta
To analyze photorefractive keratectomy (PRK) outcomes in myopia and myopic astigmatism correction using the WaveLight Allegretto Wave Eye-Q(®) excimer laser system (WaveLight Laser Technologie AG, Erlangen, Germany). 222 eyes of 151 patients underwent PRK (mean age 33.5 ± 6.8 years). Pre-operative best spectacle-corrected visual acuity (BSCVA) ranged from 0.4 to -0.1 logMAR (mean -0.03 ± 0.06). Mean spherical equivalent (SE) was -3.29 ± 1.20 D. Efficacy, predictability and safety were evaluated. Minimum follow-up was 3 months...
June 2014: International Ophthalmology
A John Kanellopoulos, George Asimellis
PURPOSE: To evaluate programmed versus achieved laser-assisted in situ keratomileusis (LASIK) flap central thickness and investigate topographic flap thickness variability, as well as the effect of potential epithelial remodeling interference on flap thickness variability. PATIENTS AND METHODS: Flap thickness was investigated in 110 eyes that had had bilateral myopic LASIK several years ago (average 4.5 ± 2.7 years; range 2-7 years). Three age-matched study groups were formed, based on the method of primary flap creation: Group A (flaps made by the Moria Surgical M2 microkeratome [Antony, France]), Group B (flaps made by the Abbott Medical Optics IntraLase™ FS60 femtosecond laser [Santa Ana, CA, USA]), and Group C (flaps made by the Alcon WaveLight(®) FS200 femtosecond laser [Fort Worth, TX, USA])...
2013: Clinical Ophthalmology
Sonia H Yoo, Saleh Al-Ageel
PURPOSE: To describe a case of a 52-year-old man with severe keratoconus who underwent femtosecond laser-assisted keratoplasty with the WaveLight FS200 femtosecond laser (Alcon Laboratories Inc). METHODS: The donor and recipient corneas were cut in a mushroom-shaped pattern. The laser parameters used on this platform for the donor and recipient corneas are described. RESULTS: Corrected distance visual acuity improved by 3 weeks postoperatively...
November 2012: Journal of 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
Qinmei Wang, Giacomo Savini, Kenneth J Hoffer, Zhen Xu, Yifan Feng, Daizong Wen, Yanjun Hua, Feng Yang, Chao Pan, Jinhai Huang
PURPOSE: To comprehensively assess the precision and agreement of anterior corneal power measurements using 8 different devices. METHODS: Thirty-five eyes from 35 healthy subjects were included in the prospective study. In the first session, a single examiner performed on each subject randomly measurements with the RC-5000 (Tomey Corp., Japan), KR-8000 (Topcon, Japan), IOLMaster (Carl Zeiss Meditec, Germany), E300 (Medmont International, Australia), Allegro Topolyzer (Wavelight AG, Germany), Vista (EyeSys, TX), Pentacam (Oculus, Germany) and Sirius (CSO, Italy)...
2012: PloS One
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
Anastasios John Kanellopoulos
BACKGROUND: The purpose of this study was to evaluate the safety and efficacy of topography-guided ablation using the WaveLight 400 Hz excimer laser in laser-assisted in situ keratomileusis (LASIK) for hyperopia and/or hyperopic astigmatism. METHODS: We prospectively evaluated 208 consecutive LASIK cases for hyperopia with or without astigmatism using the topography-guided platform of the 400 Hz Eye-Q excimer system. The mean preoperative sphere value was +3.04 ± 1...
2012: Clinical Ophthalmology
Anastasios John Kanellopoulos
PURPOSE: To evaluate the safety and efficacy of combined transepithelial topography-guided photorefractive keratectomy (PRK) therapeutic remodeling, combined with same-day, collagen cross-linking (CXL). This protocol was used for the management of cornea blindness due to severe corneal scarring. METHODS: A 57-year-old man had severe corneal blindness in both eyes. Both corneas had significant central scars attributed to a firework explosion 45 years ago, when the patient was 12 years old...
2012: Clinical Ophthalmology
Anastasios John Kanellopoulos
PURPOSE: To evaluate the safety and efficacy of higher fluence cornea collagen cross linking (CXL). METHODS: Twenty-one patients with bilateral keratoconus had randomized CXL in one eye (group A) with 7 mw/cm(2) for 15 minutes; the other eye (group B) had the standard 3 mw/cm(2) for 30 minutes; 50 um PTK with the Eye-Q 400 Hz Excimer laser (Wavelight, Erlagen, Germany) was used for epithelial removal. The patients were evaluated postoperatively at the following intervals: day 1, day 4, month 1, month 3, and then every 6 months...
2012: Clinical Ophthalmology
Zhengwei Zhang, Jiayin Wang, Weiran Niu, Mingming Ma, Kelimu Jiang, Ping Zhu, Bilian Ke
PURPOSE: To observe and analyze corneal asphericity and its related factors in Chinese subjects. METHODS: The corneal asphericity of 1052 right eyes from a Chinese population was determined using the Wavelight-ALLEGRO Topographer. The corneal asphericity coefficient Q describes the rate of curvature variation of the cornea from its center to the periphery and specifies the type of conicoid that best represents its shape. All cases were grouped by age in years (A: ≤ 9; B: 10 to 19; C: 20 to 29; D: 30 to 39; E: 40 to 49; F: ≥50), and 223 myopic cases were grouped by magnitude in spherical equivalent (SE) refractive error (low myopia, > -3...
October 2011: Optometry and Vision Science: Official Publication of the American Academy of Optometry
Catia Gambato, Anton Giulio Catania, Stela Vujosevic, Edoardo Midena
PURPOSE: To evaluate the wavefront-optimized algorithm of the Allegretto Wave Eye-Q (Wavelight AG) 400-Hz excimer laser platform. METHODS: Three hundred three eyes of 303 patients treated with advanced surface ablation were evaluated prospectively. Topical mitomycin C (MMC) was used when ablation was ≥80 μm. Efficacy, safety, and predictability at 12 months were quantified with subjective refraction, visual acuity (logMAR), and slit-lamp examination. RESULTS: Mean postoperative uncorrected distance visual acuity (UDVA) was 20/20...
November 2011: Journal of Refractive Surgery
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