Comparison of the change in posterior corneal elevation and corneal biomechanical parameters after small incision lenticule extraction and femtosecond laser-assisted LASIK for high myopia correction

Wang, Bingjie; Zhang, Zhenyong; Naidu, Rajeev Krishnan; Chu, Ren-yuan; Dai, Jinhui; Qu, Xiaomei; Yu, Zhiqiang; Zhou, Hao

doi:10.1016/j.clae.2016.01.007

Cited by 73 publications

(83 citation statements)

References 24 publications

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“…When comparing the stability during the 2-years observation period for the correction of myopia and myopic astigmatism, SMILE was likely to induce fewer instances of myopic regression than wavefront-guided LASIK, but no significant difference between groups. We suppose that factors related to corneal wound healing, inflammation and biomechanical properties could affect myopic regression after the two procedures (Dong et al 2014;Sinha Roy et al 2014;Wu et al 2014;Wu & Wang 2015;Wang et al 2016;Xia et al 2016). Dong et al (2014) reported that SMILE induces a lower degree of keratocyte apoptosis, proliferation and inflammation compared with LASIK.…”

Section: Discussionmentioning

confidence: 98%

Two‐years results of small‐incision lenticule extraction and wavefront‐guided laser in situ keratomileusis for Myopia

Kobashi

Kamiya

Igarashi

et al. 2017

Acta Ophthalmologica

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Section: Discussionmentioning

confidence: 98%

Two‐years results of small‐incision lenticule extraction and wavefront‐guided laser in situ keratomileusis for Myopia

Kobashi

Kamiya

Igarashi

et al. 2017

Acta Ophthalmologica

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“…Studies have reported that SMILE minimizes dry eye, and maintains higher corneal sensitivity [4]. In addition, the postoperative corneal biomechanical strength is theoretically greater in comparison to LASIK and FS-LASIK [5–7]. Therefore, SMILE is considered to be a good selection mode for refractive surgery.…”

Section: Introductionmentioning

confidence: 99%

Comparison of visual results and higher-order aberrations after small incision lenticule extraction (SMILE): high myopia vs. mild to moderate myopia

Jin

Wan

et al. 2017

BMC Ophthalmol

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BackgroundTo compare the refractive results and higher-order aberrations (HOAs) after small incision lenticule extraction (SMILE) in high myopia and mild to moderate myopia patients.MethodsThis prospective study included 165 eyes (86 patients) undergoing SMILE. According to the preoperative spherical equivalent (SE), treated eyes were divided into two groups: the high myopia group (more than -6.0 D, group-H) and the mild to moderate group (less than -6.0 D, group-M). Follow-up intervals were at 1 day, 10 days, 1 month and 3 months postoperatively. We obtained the following parameters: uncorrected (UDVA) and corrected distance visual acuity (CDVA), SE, efficacy and safety index, and HOAs.ResultsPreoperative SE was -7.16 ± 0.93 D in group-H and -4.34 ± 0.97 D in group-M. At 3 months postoperatively, the SE in group-H and group-M was -0.20 ± 0.37 D and 0.01 ± 0.19 D (t = - 4.11, P<0.05), respectively. It was found that 77% and 98% had an UDVA of 20/20, 98% and 99% had a CDVA of 20/20 in group-H and group-M, respectively, while 87% and 95% had a SE within ±0.5 D and ±1.0 D in group-H, and 98% and 100% in group-M. The efficacy indexes were 0.98 ± 0.18 in group-H and 1.05 ± 0.10 in group-M (t = - 3.084, p < 0.05). The safety indexes were 1.06 ± 0.09 and 1.06 ± 0.09 (t = 0.153, p > 0.05), respectively. There were significant increases in total HOAs, 3rd-order coma, and 4th-order spherical aberrations.ConclusionsSMILE is an effective and safe surgery for correcting myopia. But the target correction amount in high myopia patients should be adjusted to avoid undercorrection and acquired more satisfaction. SMILE induced increases of HOAs.Trial registrationChiTrial registration number: ChiCTR-OON-16009164. Retrospectively registered: 06.September.2016

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“…Also, highly myopic eyes had the same difference in the change of CRF but not CH in the study by Wang et al. () (Table ). Two of the studies with all degrees of myopia included also showed this difference (Wu & Wang ; Xia et al.…”

Section: Resultsmentioning

confidence: 56%

“…(), which had a higher level of evidence and examined participants with moderate‐to‐high degree of myopia, did not show the same trends in CH and CRF as the study by Wang et al. (, ) even though eyes with low degrees of myopia were not included.…”

Section: Resultsmentioning

confidence: 87%

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Comparison of corneal biomechanical changes after refractive surgery by noncontact tonometry: small‐incision lenticule extraction versus flap‐based refractive surgery – a systematic review

Rævdal

Grauslund

Vestergaard

2018

Acta Ophthalmologica

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Corneal refractive surgery disrupts corneal integrity and reduces biomechanical stability in consequence of the beneficial refractive alteration. The minimal invasive cap-based refractive procedure, small-incision lenticule extraction (SMILE), has been proposed to affect corneal integrity less than flap-based procedures, due to the fibre-sparing incision of the strong anterior corneal lamellae. Flap-based procedures include laser-assisted in situ keratomileusis (LASIK), femtosecond laser-assisted in situ keratomileusis (FS-LASIK) and femtosecond lenticule extraction (FLEx). The purpose of this systematic review was to evaluate corneal biomechanical changes by noncontact air pulse tonometry after treatment of myopia/myopic astigmatism with SMILE compared to flap-based refractive surgery. A total of 220 publications were identified through a systematic search in PubMed and Embase. Two levels of screening identified nine studies (three randomised controlled trials (RCT) and six nonrandomised clinical trials) eligible for the review. All the nonrandomised clinical trials were graded to have an overall serious risk of bias. Measurements with the Corvis ST were not included in any of the eligible studies. The RCTs found no statistical significant differences between SMILE or flap-based procedures concerning corneal hysteresis (CH) or corneal resistance factor (CRF), as measured with the Ocular Response Analyzer. However, a greater reduction in CRF and CH was found in the flap-based group in five and two of the nonrandomised studies, respectively. The findings in this review illustrate that the presumed biomechanical advantages of a cap-based small incision could not be demonstrated in existing studies and by commercially available technology. However, studies with lower levels of evidence suggest less affection of corneal viscoelastic properties after SMILE when evaluating corneal stability by noncontact tonometry.

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Comparison of the change in posterior corneal elevation and corneal biomechanical parameters after small incision lenticule extraction and femtosecond laser-assisted LASIK for high myopia correction

Abstract: FS-LASIK demonstrated a greater increase in PCE than SMILE only at 12 months, as well as a greater reduction of CRF than SMILE. There were no significant differences in PCE change over time within either group.

Cited by 73 publications

References 24 publications

Two‐years results of small‐incision lenticule extraction and wavefront‐guided laser in situ keratomileusis for Myopia

Two‐years results of small‐incision lenticule extraction and wavefront‐guided laser in situ keratomileusis for Myopia

Comparison of visual results and higher-order aberrations after small incision lenticule extraction (SMILE): high myopia vs. mild to moderate myopia

Comparison of corneal biomechanical changes after refractive surgery by noncontact tonometry: small‐incision lenticule extraction versus flap‐based refractive surgery – a systematic review

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