Corneal Higher Order Aberrations After LASIK for High Myopia With a Fast Repetition Rate Excimer Laser, Optimized Ablation Profile, and Femtosecond Laser–assisted Flap

Vega-Estrada, Alfredo; Alió, J. L.; Arba-Mosquera, Samuel; Lj, Moreno

doi:10.3928/1081597x-20120921-03

Cited by 51 publications

(44 citation statements)

References 24 publications

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“…LASIK outcomes appear to have improved in safety and efficacy with the evolutions described earlier1,13 in both refractive outcomes and induced high-order aberrations 5,14,15…”

Section: Introductionmentioning

confidence: 76%

“…Excimer lasers, used in the second step of a LASIK procedure to correct refractive error (RE), have been evolving as well, with most platforms currently utilizing flying spot technology of very high repetition rates and advanced tracking mechanisms to track intra-operatively the pupillary aperture and some even to provide cyclorotation adjustment 5–7. Aspherical ablation profiles have been employed to reduce spherical aberration associated with myopic corrections, so most LASIK procedures are performed currently as “wavefront optimized” 8.…”

Section: Introductionmentioning

confidence: 99%

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Topography-modified refraction (TMR): adjustment of treated cylinder amount and axis to the topography versus standard clinical refraction in myopic topography-guided LASIK

Kanellopoulos¹

2016

OPTH

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PurposeTo evaluate the safety, efficacy, and contralateral eye comparison of topography-guided myopic LASIK with two different refraction treatment strategies.SettingPrivate clinical ophthalmology practice.Patients and methodsA total of 100 eyes (50 patients) in consecutive cases of myopic topography-guided LASIK procedures with the same refractive platform (FS200 femtosecond and EX500 excimer lasers) were randomized for treatment as follows: one eye with the standard clinical refraction (group A) and the contralateral eye with the topographic astigmatic power and axis (topography-modified treatment refraction; group B). All cases were evaluated pre- and post-operatively for the following parameters: refractive error, best corrected distance visual acuity (CDVA), uncorrected distance visual acuity (UDVA), topography (Placido-disk based) and tomography (Scheimpflug-image based), wavefront analysis, pupillometry, and contrast sensitivity. Follow-up visits were conducted for at least 12 months.ResultsMean refractive error was −5.5 D of myopia and −1.75 D of astigmatism. In group A versus group B, respectively, the average UDVA improved from 20/200 to 20/20 versus 20/16; post-operative CDVA was 20/20 and 20/13.5; 1 line of vision gained was 27.8% and 55.6%; and 2 lines of vision gained was 5.6% and 11.1%. In group A, 27.8% of eyes had over −0.50 diopters of residual refractive astigmatism, in comparison to 11.7% in group B (P<0.01). The residual percentages in both groups were measured with refractive astigmatism of more than −0.5 diopters.ConclusionTopography-modified refraction (TMR): topographic adjustment of the amount and axis of astigmatism treated, when different from the clinical refraction, may offer superior outcomes in topography-guided myopic LASIK. These findings may change the current clinical paradigm of the optimal subjective refraction utilized in laser vision correction.

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“…LASIK outcomes appear to have improved in safety and efficacy with the evolutions described earlier1,13 in both refractive outcomes and induced high-order aberrations 5,14,15…”

Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Topography-modified refraction (TMR): adjustment of treated cylinder amount and axis to the topography versus standard clinical refraction in myopic topography-guided LASIK

Kanellopoulos¹

2016

OPTH

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“…However, postoperative spherical aberration was associated with optical and ablation zones. 24 The larger diameter optical zones could have decreased the induction of higher-order aberrations after LASIK. 25,26 We have further confirmed it in our study as the optical zone was significantly larger in the SMILE group than in the FS-LASIK group (the range of the transition zone was 1.5-2.0 mm, and the range for the optical zone was ,6.5 mm).…”

Section: Discussionmentioning

confidence: 99%

Clinical Outcomes After SMILE and Femtosecond Laser-Assisted LASIK for Myopia and Myopic Astigmatism

Liu

Chen

Wang

et al. 2016

Cornea

115

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“…In myopic eyes, refractive surgery reduces the corneal curvature by subtracting a positive meniscus of corneal tissue, creating a flatter optical zone, sometimes increasing the corneal aberrations. 2 In other words, conventional laser ablation creates an oblately shaped cornea, inducing a sudden and marked change in the corneal-curvature gradient between the centraltreated area and the peripheral-untreated area. 15 Previous studies have shown a relationship between the preoperative-refractive error and the change in corneal SA after myopic-refractive surgery.…”

Section: Discussionmentioning

confidence: 99%

“…These days, correction of high-myopic-refractive errors is reportedly associated with favorable outcomes in terms of safety, efficacy, and predictability. 1,2 However, in patients with myopia exceeding 8 diopters (D) it is known to produce more unpredictable-postoperative results than are associated with low and moderate myopia. 3 In addition, in some patients an increased level of higher-order aberrations (HOAs) is produced postoperatively, resulting in various forms of visual discomfort such as glare, halo, and starburst.…”

Section: Introductionmentioning

confidence: 99%

Clinical outcomes between optical path difference custom aspheric treatment and optimized prolate ablation photorefractive keratectomy in myopia exceeding 8 diopters

Choi¹,

Park

Lee

2014

Eye

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Purpose Comparison of visual acuity, refractive, and wavefront outcomes associated with optimized prolate ablation (OPA) and optical path difference custom aspheric treatment (OPDCAT) algorithms for correction of myopia exceeding 8 diopters (D). Patients and Methods Patients were randomly assigned to have photorefractive keratectomy (PRK) with OPA (n ¼ 32) or OPDCAT (n ¼ 21) algorithms. Visual acuity, manifest refraction, ocular and corneal higher-order aberrations, corneal asphericity, modulated-transfer function, and pointspread function were compared 1, 3, and 6 months postoperatively. Results Mean manifest-refraction spherical equivalents at 6 months were À 0.24 D in both groups. All patients in both groups had an uncorrected-distance visual acuity of 20/20 or better. Predictability ( ± 1 D from intended refraction) at 6 months was 94% in the OPA group, and in the OPDCAT group it was 86%. The OPA group had less induced corneal and ocular spherical aberrations (SAs) than the OPDCAT group. Postoperative corneal asphericity change was lowest in the OPA group. Both the groups exhibited significantlyimproved AreaRatio-Total value and insignificantly deteriorated AreaRatio-HO value throughout the postoperative period. The OPA group had significantly-higher AreaRatio-Total compared with OPDCAT group at both 1 and 6 months after the operation. Six months after surgery, the Strehl ratio had decreased in both groups, and there was no significant difference between the groups. Conclusion The OPA algorithms yielded higher-objective visual quality and predictability, induced less corneal and ocular SAs, and preserved more preoperativecorneal asphericity than the OPDCAT algorithms.

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Corneal Higher Order Aberrations After LASIK for High Myopia With a Fast Repetition Rate Excimer Laser, Optimized Ablation Profile, and Femtosecond Laser–assisted Flap

Abstract: A significant induction of corneal HOAs still exists with the latest generation Schwind excimer laser. Linear regression analysis will help predict postoperative asphericity obtained when using LASIK for the correction of high myopia.

Cited by 51 publications

References 24 publications

Topography-modified refraction (TMR): adjustment of treated cylinder amount and axis to the topography versus standard clinical refraction in myopic topography-guided LASIK

Topography-modified refraction (TMR): adjustment of treated cylinder amount and axis to the topography versus standard clinical refraction in myopic topography-guided LASIK

Clinical Outcomes After SMILE and Femtosecond Laser-Assisted LASIK for Myopia and Myopic Astigmatism

Clinical outcomes between optical path difference custom aspheric treatment and optimized prolate ablation photorefractive keratectomy in myopia exceeding 8 diopters

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