Minor Influence of Sub-Bowman Keratomileusis on the Posterior Corneal Surface at Early Stage

Yan, Pisong; Du, Zhiyu; Wu, Ningling; Xu, Yincong

doi:10.3109/02713683.2013.783078

Cited by 9 publications

(14 citation statements)

References 27 publications

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“…It may be easy to believe that ΔPCE or ΔPME was correlated with residual stromal thickness (RST) or AD, as Zhao et al [9] reported that RST was correlated with ΔPCE in their high-myopia group post SMILE, while in the current study, neither ΔPCE nor ΔPME had a significant correlation with RST, which is in accordance with previous studies [4,6,[21][22][23]. The contradiction may be caused by the different degrees of myopia corrected in surgery.…”

Section: Discussionsupporting

confidence: 88%

Comparison of the posterior corneal elevation and biomechanics after SMILE and LASEK for myopia: a short- and long-term observation

Chen

Dai

2019

Graefes Arch Clin Exp Ophthalmol

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Purpose This study compares the posterior corneal elevation and corneal biomechanics after small incision lenticule extraction (SMILE) and laser-assisted subepithelial keratomileusis (LASEK) for myopia correction in a short-and long-term observation. Methods This prospective study included 32 patients in the SMILE group and 32 patients in the LASEK group. Corneal posterior central elevation (PCE), posterior mean elevation (PME), corneal back power (Kb), and anterior chamber depth (ACD) were evaluated with Pentacam, and intraocular pressure (IOP), corneal hysteresis (CH), and corneal resistance factor (CRF) were evaluated with the ORA at pre-operation and 3 months and 3 years post-operation. Results Three months post-operatively, CH, CRF, and IOP decreased significantly and central posterior surface shifted backward in both groups (p < 0.05). CH was lower in the LASEK group (p = 0.03) and change of CH and CRF per unit corneal tissue removed (ΔCH/ablation depth (AD) and ΔCRF/AD) was lower in SMILE than in LASEK (p = 0.01, 0.03). Three years postoperatively, the PME shifted more posteriorly in LASEK (p = 0.04), but was stable in SMILE (p = 0.06). Kb flattened and ACD was shallower in both groups (compared to preoperative data, p < 0.001). CH in the LASEK group increased and is comparable to that in the SMILE group at 3 years post-operative. Conclusion Both SMILE and LASEK can change the posterior surface and corneal biomechanics. SMILE may have less influence on corneal biomechanics than LASEK at an early stage post-operative in terms of per unit corneal tissue removed, but the effect became comparable in a long-term observation.

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Section: Discussionsupporting

confidence: 88%

Comparison of the posterior corneal elevation and biomechanics after SMILE and LASEK for myopia: a short- and long-term observation

Chen

Dai

2019

Graefes Arch Clin Exp Ophthalmol

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“…() inferred that peripheral steepening and central flattening of the posterior corneal surface at early‐stage operative eyes (Yan et al. ), which is consistent with our results.…”

Section: Discussionsupporting

confidence: 93%

“…The negative value is greater, the cornea is more prolate (Read et al 2006;Calossi 2007;Gonzalez-Meijome et al 2007). Our data demonstrated that the mean Qvalue of LASIK eyes changed into a positive direction compared to (Yan et al 2013), which is consistent with our results.…”

Section: Discussionsupporting

confidence: 92%

Posterior corneal surface differences between non‐laser in situ keratomileusis (LASIK) and 10‐year post‐LASIK myopic eyes

Wang

Lin

et al. 2017

Acta Ophthalmologica

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“…With posterior corneal forward displacement proved to be an important warning sign of postoperative corneal instability, posterior corneal elevation has long been adopted in evaluating corneal displacement after nearly all keratorefractive surgeries including PRK [ 18 ], laser assisted subepithelial keratomileusis (LASEK), sub-Bowman’s keratomileusis (SBK) [ 19 ], LASIK [ 20 ] and SMILE [ 21 ].…”

Section: Discussionmentioning

confidence: 99%

Impact of ablation ratio on 5-year postoperative posterior corneal stability after refractive surgery: SMILE and FS-LASIK

Yang

Zhao

et al. 2020

Eye and Vis

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Background To investigate the impact of the ablation ratio on 5-year postoperative posterior corneal stability in myopic eyes after small incision lenticule extraction (SMILE) and femtosecond laser-assisted in situ keratomileusis (FS-LASIK) surgery. Methods A prospective, nonrandomized, cohort study: 80 eyes of 43 patients underwent SMILE surgery and 63 eyes of 32 patients underwent FS-LASIK surgery at the EYE & ENT Hospital, Fudan University. Ablation ratio was defined as lenticule thickness (SMILE cases) or ablation depth (FS-LASIK cases) divided by central corneal thickness (CCT). Posterior corneal elevation changes were recorded as posterior central elevation (PCE), posterior corneal surface at thinnest point (PTE) and posterior corneal mean elevation (PME). Patients were followed up at 6-month and 5-year interval to investigate the impact of the ablation ratio on posterior corneal elevation after SMILE and FS-LASIK surgery. Results PCE dropped at the 6-month follow-up for both SMILE (decreased by −1.11 ± 2.93 μm, P < 0.05) and FS-LASIK groups (decreased by −0.46 ± 3.72 μm, P < 0.05). PTE also dropped in SMILE (reduced by −2.04 ± 3.02 μm, P < 0.05) and FS-LASIK group (reduced by −1.28 ± 4.21 μm, P < 0.05) at the 6-month follow-up. Stable PCE (elevation change: SMILE −0.28 ± 4.03 μm; FS-LASIK 0.79 ± 4.13 μm, P > 0.05) and PTE (elevation change: SMILE −0.08 ± 4.28 μm; FS-LASIK 1.42 ± 3.85 μm, P > 0.05) for both groups were recorded at the 5-year follow-up compared to the 6-month visit. Ablation ratio was strongly correlated with 5-year postoperative PCE (β = 2.68 ± 1.05, P < 0.01) and PTE (β = 2.35 ± 1.17, P < 0.05). Cut-off value for 5-year postoperative raised PCE and PTE was 27.3 and 27.1%, respectively. Conclusions Ablation ratio was strongly correlated with postoperative posterior corneal elevation in a 5-year follow-up in both SMILE and FS-LASIK groups. PCE and PTE underwent slight backward displacement 6-month postoperatively and remain stable at the 5-year follow-up. Threshold of the ablation ratio for resisting forward displacement of posterior corneal surface was 27.3 and 27.1% for SMILE and FS-LASIK groups, respectively.

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Minor Influence of Sub-Bowman Keratomileusis on the Posterior Corneal Surface at Early Stage

Cited by 9 publications

References 27 publications

Comparison of the posterior corneal elevation and biomechanics after SMILE and LASEK for myopia: a short- and long-term observation

Comparison of the posterior corneal elevation and biomechanics after SMILE and LASEK for myopia: a short- and long-term observation

Posterior corneal surface differences between non‐laser in situ keratomileusis (LASIK) and 10‐year post‐LASIK myopic eyes

Impact of ablation ratio on 5-year postoperative posterior corneal stability after refractive surgery: SMILE and FS-LASIK

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