Q-factor customized ablation profile for the correction of myopic astigmatism

Koller, Tobias; Iseli, Hans Peter; Hafezi, Farhad; Mrochen, Michael; Seiler, Theo

doi:10.1016/j.jcrs.2006.01.049

Cited by 123 publications

(105 citation statements)

References 26 publications

(22 reference statements)

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“…Recently introduced laser ablation algorithms similar to the Technolas 217z100 include a Q-factor-customized aspheric ablation profi le (Eye-Q 400 Hz excimer laser; WaveLight, Erlangen, Germany) 14 and an optimized aspheric transition zone (Nidek EC-5000 OATz; Nidek, Gamagori, Japan). 15 Compared with the Bausch and Lomb instrument equipped with the Technolas 217z100, the Eye-Q 400 Hz excimer laser equipped with Q-factor-customized ablation uses virtually the same program for determining the Q-value for laser ablation preoperatively, although the ablation pattern and excimer laser system are different.…”

Section: Discussionmentioning

confidence: 99%

Aspheric laser in situ keratomileusis for the correction of myopia using the technolas 217z100: Comparison of outcomes versus results from the conventional technique

et al. 2009

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Section: Discussionmentioning

confidence: 99%

Aspheric laser in situ keratomileusis for the correction of myopia using the technolas 217z100: Comparison of outcomes versus results from the conventional technique

et al. 2009

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“…The introduction of the 'prolate optimization function' of the MEL80 platform (Carl Zeiss Meditec, Jena, Germany) and Wavelight Allegretto (Alcon/WaveLight Laser Technologie GmbH, Erlangen, Germany), for example, brought hope that they could optimize the postoperative asphericity of the cornea [10][11][12]. Studies show these to not only be safe and efficient as conventional treatment for correcting refractive errors, but also suggest that they might better maintain corneal shape and induce smaller increases in spherical aberrations than standard ablations [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Three different aspheric treatment algorithms of laser-assisted sub-epithelial keratectomy in patients with high myopia

Ahn

Choi²,

Kim

et al. 2012

Jpn J Ophthalmol

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Purpose To compare visual outcomes and quality in high myopia patients treated using one of three aspheric treatment algorithms based on the NIDEK Advanced Vision Excimer Laser System. Methods Sixty eyes of 60 high myopia patients ([-6 diopter) underwent topography-guided (CATz) (20 eyes), wavefront-guided (OPDCAT) (20 eyes), or topography and wavefront-guided (OPA) (20 eyes) laser-assisted subepithelial keratectomy. Visual acuity, manifest refraction spherical equivalent (MRSE), ocular and corneal higher order aberrations, corneal asphericity, point spread function (Strehl ratio) and modulation transfer function (MTF) were compared preoperatively and 1, 3 and 6 months postoperatively.Results Six months after surgery, logMAR uncorrected visual acuity was 0.02 ± 0.09 in the CATz group, 0.02 ± 0.07 in the OPDCAT group and 0.02 ± 0.08 in the OPA group, and there were no statistically significant differences (P = 0.5355). No statistical differences were found among the three groups in MRSE (P = 0.3541). Induced spherical aberrations and the change of corneal asphericity were less in the OPA group than in the others (P \ 0.0001). The MTF was slightly better in the OPA group than in the others. The Strehl ratio showed no statistically significant differences among the three groups. Conclusions All three aspheric treatment algorithms were safe and effective in correcting high myopia. Among them, the OPA algorithm maintained optical quality and physiologic cornea longer than the others.

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“…[14][15][16] In the current study we present measurements of the corneal wavefront aberration in 50 eyes (right and left eyes of 25 subjects), both preoperatively and 6 months after non-customised treatment. We analyzed the correlation of individual aberrations across the population, as well as the correlation of aberrations between the right and left eyes of the same subjects.…”

Section: Introductionmentioning

confidence: 99%

Bilateral Symmetry before and Six Months after Aberration-Free™ Correction with the SCHWIND AMARIS TotalTech Laser: Clinical Outcomes

Arbelaez

Vidal

Arba-Mosquera

2010

Journal of Optometry

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PURPOSE:To compare the preoperative and postoperative bilateral symmetry between OD and OS eyes that have undergone femto-LASIK using the Ziemer LDV femtosecond laser system, the SCHWIND AMARIS Excimer Laser and the Aberrationfree TM profiles implemented in the SCHWIND Custom Ablation Manager software. METHODS: A total of 25 LASIK patients were bilaterally evaluated at the six-month follow-up visit. In all cases standard examinations, pre-and postoperative analysis with corneal wavefront topography (OPTIKON Scout) were performed. Aberration-free TM aspheric treatments were devised using the Custom Ablation Manager software and ablations were performed by means of the SCHWIND AMARIS flying-spot excimer laser system (both SCHWIND eyetech-solutions). In all cases LASIK flaps were created using an LDV femtosecond laser (Ziemer Group). The OD/OS bilateral symmetry was evaluated in terms of corneal wavefront aberration. RESULTS: Preoperatively, 11 Zernike terms showed significant bilateral (OS-vs.-OD) symmetry, and only 6 Zernike terms were significantly different. Overall, 23 out of the 25 patients showed significant bilateral symmetry, and only 2 out of 25 patients showed significant differences. None of the aberration metrics changed from pre-to postoperative values by a clinically relevant amount. At the 6-month postoperative visit, 12 Zernike terms showed significant symmetry, and 8 terms were significantly different. Overall, 22 out of 25 patients showed significant bilateral symmetry (OS vs. OD), and only 3 out of 25 patients showed significant differences. Also, this postoperative examination revealed that 6 Zernike terms lost significant OS-vs.-OD symmetry, but 4 Zernike terms gained significant symmetry. Finally, 4 patients lost significant bilaterality, and 2 patients gained significant bilaterality: bilateral symmetry between eyes was better maintained in those patients with a clear preoperative bilateral symmetry. CONCLUSIONS: Aberration-Free Treatments with the SCHWIND AMARIS did not induce clinically significant aberrations, maintained the global OD-vs.-OS bilateral symmetry, as well as the bilateral symmetry between corresponding Zernike terms (which influences binocular summation). RESUMEN OBJETIVO:Comparar la simetría bilateral (OD-OS) preoperativa y postoperativa, en ojos sometidos a una operación de femto-LASIK donde se empleó el sistema láser de femtosegundos Ziemer LDV, el láser de excímero SCHWIND AMARIS y donde se implementaron perfiles de ablación Aberration-free TM (sin aberraciones) en el software de control del láser (SCHWIND Custom Ablation Manager). MÉTODOS: Se evaluaron bilateralmente un total de 25 pacientes de LASIK transcurridos 6 meses de la operación. En todos los casos se llevó a cabo una revisión estándar, y se realizaron medidas pre-y postoperativas de topografía corneal (OPTIKON Scout). Se diseñaron tratamientos asféricos de tipo Aberration-free TM utilizando el software de control del láser, denominado Custom Ablation Manager. La ablación se realizó mediante el sistem...

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Q-factor customized ablation profile for the correction of myopic astigmatism

Abstract: Regarding safety and refractive efficacy, custom-Q ablation profiles were clinically equivalent to wavefront-guided profiles in corrections of myopia up to -9 D and astigmatism up to 2.5 D. Corneal asphericity was less impaired by the custom-Q treatment up to -5 D of myopia.

Cited by 123 publications

References 26 publications

Aspheric laser in situ keratomileusis for the correction of myopia using the technolas 217z100: Comparison of outcomes versus results from the conventional technique

Aspheric laser in situ keratomileusis for the correction of myopia using the technolas 217z100: Comparison of outcomes versus results from the conventional technique

Three different aspheric treatment algorithms of laser-assisted sub-epithelial keratectomy in patients with high myopia

Bilateral Symmetry before and Six Months after Aberration-Free™ Correction with the SCHWIND AMARIS TotalTech Laser: Clinical Outcomes

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