Comparison of Corneal Flap Morphology Using AS-OCT in LASIK With the WaveLight FS200 Femtosecond Laser Versus a Mechanical Microkeratome

Zhang, Yu; Chen, Yue Guo; Xia, Yuanqing

doi:10.3928/1081597x-20130415-03

Cited by 44 publications

(37 citation statements)

References 15 publications

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“…This reliability is particularly valuable for thin flap LASIK (90−120 micron thickness) techniques, which have been shown to limit the reduction in corneal tensile strength 9,37. The overall rate of ectasia has anecdotally been on the decline; however, due to the rarity of cases, the evidence of an overall trend is lacking.…”

Section: Discussionmentioning

confidence: 99%

“…In the last half decade, there has been a shift towards femtosecond laser-assisted flap creation, which provides a more predictable flap profile 9,10. In this study, we examined the rate of ectasia in patients undergoing femtosecond laser-assisted LASIK as well as the incidence of abnormal topography, in patients who were identified as having no preoperative risk factors.…”

Section: Introductionmentioning

confidence: 99%

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Rate of ectasia and incidence of irregular topography in patients with unidentified preoperative risk factors undergoing femtosecond laser-assisted LASIK

Moshirfar¹,

Smedley²,

Muthappan³

et al. 2013

OPTH

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PurposeTo report the rate of postoperative ectasia after laser-assisted in situ keratomileusis (LASIK) with femtosecond laser-assisted flap creation, in a population of patients with no identified preoperative risk factors.MethodsA retrospective case review of 1,992 eyes (1,364 patients) treated between March 2007 and January 2009 was conducted, with a follow up of over 4 years. After identifying cases of ectasia, all the patient charts were examined retrospectively for preoperative findings suggestive of forme fruste keratoconus (FFKC).ResultsFive eyes of four patients with post-LASIK ectasia were identified. All eyes passed preoperative screening and received bilateral LASIK. One of the five patients developed ectasia in both eyes. Three patients retrospectively revealed preoperative topography suggestive of FFKC, while one patient had no identifiable preoperative risk factors. Upon review of all the charts, a total 69 eyes, including four of the five eyes with ectasia, were retrospectively found to have topographies suggestive of FFKC.ConclusionWe identified four cases of post-LASIK ectasia that had risk factors for FFKC on reexamination of the chart and one case of post-LASIK ectasia with no identifiable preoperative risk factors. The most conservative screening recommendations would not have precluded this patient from LASIK. The rate of purely iatrogenic post-LASIK ectasia at our center was 0.05% (1/1,992), and the total rate of post-LASIK ectasia for our entire study was 0.25% (1/398). The rate of eyes with unrecognized preoperative FFKC that developed post-LASIK ectasia was 5.8% (1/17).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rate of ectasia and incidence of irregular topography in patients with unidentified preoperative risk factors undergoing femtosecond laser-assisted LASIK

Moshirfar¹,

Smedley²,

Muthappan³

et al. 2013

OPTH

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“…The flap created by using femtosecond laser is more predictable and has better morphology than that created by microkeratome [9,10]. The most prominent morphological difference was the absence of the chatter marks on the edges of the stromal bed, which is very common in microkeratome due to blade movement [10].…”

Section: Anatomical Finding Of Smilementioning

confidence: 99%

Femtosecond laser refractive surgery

Lee

Chuck

Park

2015

Current Opinion in Ophthalmology

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“…Commercially available femtosecond lasers in refractive surgery are the IntraLase (Abbott Medical Optics Inc, Santa Ana, CA, USA), which was the first femtosecond laser introduced in the US in 2001;11 the Technolas Femtosecond Workstation, formerly known as Femtec, by Technolas Perfect Vision (Munich, Germany); the FEMTO LDV by Ziemer Ophthalmic Systems (Port, Switzerland), introduced in the late 2005;3 the Visumax by Carl Zeiss Meditec AG (Jena, Germany), introduced in the fall of 2006;3 and the WaveLight FS200 (Alcon Laboratories, Inc., Fort Worth, TX, USA) that received US Food and Drug Administration approval in 2010 5…”

Section: Introductionmentioning

confidence: 99%

Comparison of efficacy, safety, and predictability of laser in situ keratomileusis using two laser suites

Meidani

Tzavara

2016

OPTH

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PurposeThe main aim of this study was to compare the efficacy, safety, and predictability of femtosecond laser-assisted in situ keratomileusis performed by two different laser suites in the treatment of myopia for up to 6 months.MethodsIn this two-site retrospective nonrandomized study, myopic eyes that underwent laser-assisted in situ keratomileusis using IntraLase FS 60 kHz formed group 1 and those using WaveLight FS200 femtosecond laser system formed group 2. Ablation was performed with Visx Star S4 IR and WaveLight EX500 Excimer lasers, respectively, in groups 1 and 2. Both groups were well matched for age, sex, and mean level of preoperative refractive spherical equivalent (MRSE). Uncorrected distance visual acuity, corrected distance visual acuity, and MRSE were evaluated preoperatively and at 1 week, 1 month, and 6 months after treatment.ResultsFifty-six eyes of 28 patients were included in the study. At 6-month follow-up postop, 78.6% of eyes in group 1 and 92.8% of eyes in group 2 achieved an uncorrected distance visual acuity of 20/20 or better (P=0.252). 35.7% and 50% in group 1 and group 2, respectively, gained one line (P=0.179). No eye lost lines of corrected distance visual acuity. Twenty-five eyes in group 1 (92.7%) and 27 eyes in group 2 (96.3%) had MRSE within ±0.5 D in the 6-month follow-up (P>0.999). The mean efficacy index at 6 months was similar in group 1 and group 2 (mean 1.10±0.12 [standard deviation] vs 1.10±0.1) (P=0.799). The mean safety index was similar in group 1 and group 2 (mean 1.10±0.10 [standard deviation] vs 1.10±0.09) (P=0.407). Conclusion: The outcomes were excellent between the two laser suites. There were no significant differences at 6-month follow-up postop between the two laser systems.

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Comparison of Corneal Flap Morphology Using AS-OCT in LASIK With the WaveLight FS200 Femtosecond Laser Versus a Mechanical Microkeratome

Abstract: AS-OCT showed that the flaps created by the WaveLight femtosecond laser were more accurate, reproducible, and uniform than those created by the Moria microkeratome.

Cited by 44 publications

References 15 publications

Rate of ectasia and incidence of irregular topography in patients with unidentified preoperative risk factors undergoing femtosecond laser-assisted LASIK

Rate of ectasia and incidence of irregular topography in patients with unidentified preoperative risk factors undergoing femtosecond laser-assisted LASIK

Femtosecond laser refractive surgery

Comparison of efficacy, safety, and predictability of laser in situ keratomileusis using two laser suites

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Comparison of Corneal Flap Morphology Using AS-OCT in LASIK With the WaveLight FS200 Femtosecond Laser Versus a Mechanical Microkeratome

Abstract: AS-OCT showed that the flaps created by the WaveLight femtosecond laser were more accurate, reproducible, and uniform than those created by the Moria microkeratome.

Cited by 44 publications

References 15 publications

Rate of ectasia and incidence of irregular topography in patients with unidentified preoperative risk factors undergoing femtosecond laser-assisted LASIK

Rate of ectasia and incidence of irregular topography in patients with unidentified preoperative risk factors undergoing femtosecond laser-assisted LASIK

Femtosecond laser refractive surgery

Comparison of efficacy, safety, and predictability of&nbsp;laser in situ keratomileusis&nbsp;using two laser suites

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Comparison of efficacy, safety, and predictability of laser in situ keratomileusis using two laser suites