Comparison of visual outcomes after femtosecond laser-assisted LASIK versus flap-off epipolis LASIK for myopia

Piao, Junjie; Whang, Woong-Joo; Joo, Choun‐Ki

doi:10.1186/s12886-020-01579-7

Cited by 9 publications

(7 citation statements)

References 40 publications

(47 reference statements)

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“…Others only evaluated Q value changes after a therapeutic intervention (mainly refractive surgery) that were not included in this table due to their small sample size. 12,[38][39][40][41][42] As shown in Table 6, reported values of the mean anterior Q value cover a wide range from À0.03 to À0.44. Also, only two studies considered the posterior corneal asphericity, with mean reported posterior Q values of À0.20 and À0.26.…”

Section: Discussionmentioning

confidence: 99%

“…This list includes studies that primarily aimed to investigate the distribution of the Q value or its associated factors. Others only evaluated Q value changes after a therapeutic intervention (mainly refractive surgery) that were not included in this table due to their small sample size 12,38‐42 . As shown in Table 6 , reported values of the mean anterior Q value cover a wide range from −0.03 to −0.44.…”

Section: Discussionmentioning

confidence: 99%

“…À0.39 AE 0.14 (À0 42. to À0.35) À0.36 AE 0.11 (À0.39 to À0.33) Emmetropia 813 À0.34 AE 0.17 (À0.36 to À0.33) À0.41 AE 0.15 (À0.42 to À0.40) Myopia 497 À0.37 AE 0.17 (À0.39 to À0.36) À0.40 AE 0.15 (À0.41 to À0.39) Hyperopia 1,147 À0.34 AE 0.16 (À0.35 to À0.33) À0.42 AE 0.15 (À0.43 to À0.41)…”

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confidence: 99%

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Corneal asphericity and related factors in the geriatric population: A population‐based study

Hashemi

Nabovati

Aghamirsalim

et al. 2021

Ophthalmic Physiologic Optic

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Purpose: To determine the distribution of the corneal asphericity coefficient (Q value) and related factors in an Iranian geriatric population. Methods: This population-based study was conducted in 2019 in Tehran, using stratified multistage random cluster sampling. The study population was ≥60 years of age. Participants underwent corneal imaging using a Pentacam HR. Mean keratometry, corneal astigmatism, central corneal thickness, anterior chamber depth and the overall anterior and posterior Q values (for 8 mm chord diameter) were recorded. Axial length measurements were performed using the IOL Master 500. Results: 2457 eyes of 2457 individuals were analysed. The mean age was 67.3 AE 5.82 years and 1479 (60.2%) were female. The mean Q value for the anterior corneal surface was À0.35 AE 0.17 (95% CI: À0.35 to À0.34). The anterior Q value showed a statistically significant inverse relationship with axial length and mean keratometry, and a significant direct association with anterior chamber depth and corneal astigmatism. The mean posterior Q value was À0.41 AE 0.15 (95% CI: À0.42 to À0.40). The posterior Q value had a significant direct relationship with age, anterior chamber depth, mean keratometry and corneal astigmatism. Conclusion:The corneal Q values in this geriatric Iranian population were more negative than the values reported in most previous studies. Corneal asphericity was greater affected by ocular biometry and corneal curvature than demographic factors and refractive status.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Corneal asphericity and related factors in the geriatric population: A population‐based study

Hashemi

Nabovati

Aghamirsalim

et al. 2021

Ophthalmic Physiologic Optic

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“…With advances in techniques used for epithelium removal, femtosecond laser-assisted in situ keratomileusis (FS-LASIK) has emerged as a new approache in the eld of refractive surgery. For reduction of postoperative pain, corneal ectasia, and dry-eye symptoms [3][4][5], femtosecond lenticule extraction is a new one-step procedure to create a ap and a refractive lenticule. A modi ed procedure, small-incision lenticule extraction (SMILE), potentially offers biomechanical advantages over FS-LASIK surgery [6,7].…”

Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of the Visual and Refractive Outcomes Following SMILE, FS-LASIK, and T-PRK Surgery: A Retrospective, Non-Blinded Clinical Study

Piao

2021

Preprint

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Background: To comparatively evaluate of the visual and refractive outcomes after small-incision lenticule extraction (SMILE), femtosecond laser-assisted in situ keratomileusis (FS-LASIK), and transepithelial photorefractive keratectomy (T-PRK) surgery.Methods: This was a retrospective, case-series, non-blinded clinical study. Consecutive eligible patients underwent SMILE, FS-LASIK, and T-PRK at the Department of Ophthalmology of Peking Union Medical Hospital, a tertiary referral center. All myopic patients were treated with corneal refractive surgery (SMILE, FS-LASIK, and T-PRK) using the VisuMax (Carl Zeiss Meditec AG, Jena, Germany) 500-kHz femtosecond laser system and the Amaris 750S excimer laser platform (SCHWIND eye-tech solutions, Kleinostheim, Germany). Visual and topographic astigmatism changes at 6 months were the main outcome measure. Secondary outcomes were the efficacy index at 1, 3, and 6 months postoperatively.Results: We recruited 75 consecutive patients (mean age, 27.88 ± 5.76 years; 68% women; all Asian) with no significant differences between groups in terms of preoperative demographic data, except in preoperative spherical equivalent (SE) (-5.54 ± 1.86 D, -5.64 ± 1.66 D, and -3.78 ± 1.30 D, respectively; P<0.001), astigmatism (1.24 ± 1.62 D, 1.16 ± 0.75 D, and 0.72 ± 0.42 D, respectively; P=0.008), and residual bed thickness (313.08 ± 32.18 μm, 427.59 ± 30.69 μm, and 427.09 ± 41.07 μm, respectively; P<0.001). A superior efficacy index was shown in SMILE and FS-LASIK compared to T-PRK 1 month after surgery.Conclusions: The results from this retrospective, non-blind, case-series clinical study suggest that all of the corneal refractive surgery options are safe and effective. However, while SMILE and FS-LASIK procedures have equal visual outcomes, they have superior efficacy index values in the early postsurgical period.

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“…In 2014, an anti-CI formation software was used with the VISX Star S4 excimer laser, which signi cantly decreased the rate of CI formation and improved postoperative best-corrected distance visual acuity [11,12]. Differences in epithelial pro les can mask measures of corneal topography, such as corneal stress concentration directions between the optical zone and the untreated ablation zone [12,13].…”

Section: Introductionmentioning

confidence: 99%

Corneal Epithelial Remodeling After Femtosecond Laser-Assisted in Situ Keratomileusis Combined with Intraoperative Accelerated Corneal Collagen Crosslinking for Myopia: A Retrospective Study

Piao

Wang

et al. 2021

Preprint

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Background This study analyzed regional corneal thickness remodeling, biomechanical properties, and visual outcomes after femtosecond laser-assisted in situ keratomileusis combined with intraoperative accelerated corneal collagen crosslinking (LASIK Xtra) for myopia. Methods This retrospective study comprised 21 consecutive patients (18 women and 3 men; 42 eyes) who were treated with LASIK Xtra. All treatments were performed with ultraviolet-A (energy, 2.7 J/cm2; irradiance, 30 mW/cm2), using continuous (90 s) illumination. Postoperative values of corneal biometrics and visual outcomes were compared with preoperative values. Corneal thickness changes were evaluated using anterior segment optical coherence tomography. All patients were followed up for 12 months postoperatively. Preoperative and postoperative data were compared statistically using the paired t-test for normally distributed parameters and the Wilcoxon rank-sum test and Friedman analysis of variance with Bonferroni correction for non-normally distributed data. Results Uncorrected distance visual acuity (UDVA) significantly improved at 6 months after surgery (P < 0.001). The central and inner regional corneal epithelial thickness significantly increased after LASIK Xtra (P < 0.05 for all), while peripheral corneal epithelial thickness remained stable at 12 months after surgery. There was also a statistically significant decreased in the stromal thickness at most locations (P < 0.05 for all), except in the outer superior and outer superior-temporal regions. Conclusion LASIK Xtra provided predictable postoperative UDVA, corneal curvature, and corneal biomechanical stability. Since the retrospective study results depended on the cohort members’ past information, it is inferred and confirmed that regular corneal thickness remodeling occurred after treatment.

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Comparison of visual outcomes after femtosecond laser-assisted LASIK versus flap-off epipolis LASIK for myopia

Cited by 9 publications

References 40 publications

Corneal asphericity and related factors in the geriatric population: A population‐based study

Corneal asphericity and related factors in the geriatric population: A population‐based study

Comparative Evaluation of the Visual and Refractive Outcomes Following SMILE, FS-LASIK, and T-PRK Surgery: A Retrospective, Non-Blinded Clinical Study

Corneal Epithelial Remodeling After Femtosecond Laser-Assisted in Situ Keratomileusis Combined with Intraoperative Accelerated Corneal Collagen Crosslinking for Myopia: A Retrospective Study

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