Two-year successful results of femto-LASIK in steep and opacified corneas

2020 ◽  
Vol 1 (1) ◽  
pp. 37-43
Author(s):  
Amr Mounir ◽  
Emad Latif Matthias ◽  
Islam Awny
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Intraoperative Complications ◽  
Anterior Segment ◽  
Laser In Situ Keratomileusis ◽  
Distance Visual Acuity ◽  
Uncorrected Distance Visual Acuity ◽  
Refractive Correction ◽  
Corneal Opacities ◽  
The Right

  Background: Flap creation is the most critical step of laser in situ keratomileusis (LASIK). The introduction of the femtosecond laser with its uniform flaps, which enhance the accuracy of LASIK, has decreased the risk of flap-related complications like buttonholes and incomplete flaps. We recommended femtosecond laser-assisted LASIK (FS-LASIK) in the presence of superficial corneal opacities. Case Presentation: We report a case of a 31-year-old female who reported to the Cornea clinic of the Sohag Center for LASIK and Corneal Surgeries, Sohag, Egypt, complaining of bilateral decreased vision due to refractive error. The uncorrected distance visual acuity (UDVA) and corrected distance visual acuity (CDVA) were 0.01 and 0.7 with a refractive correction of -3.50Ds/ –3.00Dc x 172° in the right eye and 0.01 and 0.6 with a refractive correction of -1.75 Ds/-6.00Dc x164° in the left eye, respectively. Slit-lamp examination of the anterior segment showed bilateral superior vascularized corneal scars and a linear superior conjunctival scar suggestive of old trachoma. Corneal tomographic imaging with a Scheimpflug based tomography device (Oculus Inc., Wetzlar, Germany) revealed a symmetrical bow tie with a very steep cornea without other ectatic changes. The patient underwent bilateral FS-LASIK with an excimer laser. No intraoperative complications occurred. She was followed up for two years with serial corneal topographies and stable post-LASIK results and visual outcomes. Conclusions: FS-LASIK, in the presence of superficial corneal opacities, was safe and effective and induced no complications with special precautions. However, these findings are yet to be confirmed using well‐designed clinical studies with larger samples and longer follow-ups.

scholarly journals Effect of Transepithelial Photorefractive Keratectomy without Mitomycin C in the Treatment of Femtosecond Laser In Situ Keratomileusis Corneal Flap Complications

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Jing Wang ◽  
Weiqian Cao ◽  
Liming Tao
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Mitomycin C ◽  
Laser In Situ Keratomileusis ◽  
Photorefractive Keratectomy ◽  
Distance Visual Acuity ◽  
Uncorrected Distance Visual Acuity ◽  
Haze Formation

Purpose. To assess the efficacy and safety of transepithelial photorefractive keratectomy (TPRK) without mitomycin C as treatment for femtosecond laser in situ keratomileusis (FS-LASIK) corneal flap complications. Methods. Eight patients with corneal flap complications that occurred after FS-LASIK (five with eccentric flaps, two with buttonhole flaps, and one with a thick flap) were included in the study. Patients were treated with TPRK without mitomycin C between two weeks and twelve months after surgery. The postoperative manifest refraction, uncorrected distance visual acuity, and haze formation were assessed during six months of follow-up. Results. The mean manifest refractive spherical and cylinder refraction was 0.16 ± 0.26 and −0.44 ± 0.33 diopters, respectively, at six months postoperatively. The uncorrected distance visual acuity was above 20/25 in all patients after six months of follow-up. No haze formation was detected. Conclusions. TPRK without mitomycin C appears to be a safe and effective treatment for FS-LASIK corneal flap complications.

scholarly journals Redo surgery using IntraLase femtosecond laser for treating a decentered laser in situ keratomileusis flap

2017 ◽  
Vol 46 (2) ◽  
pp. 901-907
Author(s):  
Yulin Lei ◽  
Jie Hou ◽  
Xiuyun Zheng
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Intraoperative Complications ◽  
Anterior Segment ◽  
Laser In Situ Keratomileusis ◽  
Redo Surgery ◽  
Laser Technique ◽  
Uncorrected Visual Acuity

Objective Decentered flaps are rarely reported after femtosecond laser-assisted in situ keratomileusis flap procedures. We present a patient with a decentered flap after preparation of a corneal flap using the Femto LDV technique. Methods The 22-year-old man required a redo operation because of a decentered corneal flap. It was performed the same day at the patient's insistence and with his consent. The new corneal flap for the redo surgery was prepared using the femtosecond laser technique and IntraLase. Results Uncorrected visual acuity for each eye was 1.2 during the 12-month follow-up. The results of the Femtosecond laser technique showed good predictability and repeatability regarding the preparation of corneal flaps, but it still may cause some intraoperative complications. Conclusion Once redo surgery is needed, the size and depth of the initially prepared flap should be determined using anterior segment optical coherence tomography to pre-set the parameters for preparation of the redo flap.

scholarly journals Long-term Stability of Ectasia in a Young Patient with Asymmetric Keratoconus

2015 ◽  
Vol 4 (2) ◽  
pp. 66-68
Author(s):  
Rosane de Oliveira Corrêa ◽  
Ana Laura Caiado Canedo ◽  
Rozalia Beildeck ◽  
Marcella Quaresma Salomão ◽  
Penelope Burle de Politis
Keyword(s):  
Visual Acuity ◽  
Young Patient ◽  
Distance Visual Acuity ◽  
Long Term Stability ◽  
Uncorrected Distance Visual Acuity ◽  
Manifest Refraction ◽  
Corrected Distance Visual Acuity ◽  
Ring Segment ◽  
Intracorneal Ring Segment ◽  
The Right

ABSTRACT Purpose To report the clinical course of a typical young patient presenting with asymmetric keratoconus (KC), that demonstrates that stabilization of the ectatic process is possible without cross-linking (CXL) procedure. Methods Case report and review of the literature. Results A 17-year-old male patient was referred due to the diagnosis of keratoconus. Patient complained of loss of vision in the left eye (OS). Uncorrected distance visual acuity (UDVA) was 20/25+ in the right eye (OD) and 20/80 in the left eye; wavefront-assisted manifest refraction gave best corrected distance visual acuity (CDVA) of 20/20 in OD and 20/40 in OS. The diagnosis of keratoconus was confirmed with Placido disk-based topography (Oculus Keratograph 4), and Pentacam HR corneal tomography (Oculus Optikgeräte GmbH, Wetzlar, Germany). Femtosecond laser-assisted intracorneal ring segment (ICRS) implantation was performed in the left eye and treatment for allergy was prescribed for both eyes, along with patient education and advice not to rub the eyes. After 3 months, significant improvement was observed on UDVA (20/30) and CDVA (20/20) in the left eye. Topometric and tomographic stability of ectasia was observed in the right eye in a 4-year follow-up. Conclusion Intracorneal ring segment caused significant regularization of the corneal shape and improvement on visual acuity. Ectasia stability was achieved with no need for CXL, despite the patient's young age. This case raises the point that the indication of CXL for every keratoconic patient should be reconsidered. How to cite this article de Oliveira Corrêa R, Canedo ALC, Beildeck R, Salomão MQ, de Politis PB, Ambrósio R Jr. Longterm Stability of Ectasia in a Young Patient with Asymmetric Keratoconus. Int J Kerat Ect Cor Dis 2015;4(2):66-68.

Unilateral Ectasia characterized by Advanced Diagnostic Tests

2016 ◽  
Vol 5 (1) ◽  
pp. 40-51 ◽  
Author(s):  
Bernardo Lopes ◽  
Marcella Q Salomão ◽  
Isaac C Ramos ◽  
Fernando Faria-Correia
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Diagnostic Tests ◽  
Diagnostic Methods ◽  
Distance Visual Acuity ◽  
Epithelial Thickness ◽  
Ring Segment ◽  
Intracorneal Ring Segment ◽  
The Right

ABSTRACT To describe a case of very asymmetric ectasia successfully treated by femtosecond laser-assisted intracorneal ring segment implantation, in which the diagnosis of unilateral ectasia in the right eye was based on the clinical findings including history, follow-up, and advanced diagnostic data. The patient's history was positive for ocular allergy with moderate- to-intense eye rubbing only in the right eye. The uncorrected distance visual acuity was 20/63 in the right eye and 20/32 in the left eye. The corrected distance visual acuity (CDVA) was 20/40 in the right eye (-1.75-4.00 × 35°) and 20/16 in the left eye (-0.50-0.25 × 115°). After femtosecond laser-assisted intracorneal ring segment implantation, the right eye improved CDVA to 20/20-1. Concerning ectasia/keratoconus diagnosis, the left eye remained stable over 1 year of follow-up with unremarkable topometric, tomographic, and biomechanical findings. Epithelial thickness mapping by spectral domain optical coherence tomography and very-high-frequency digital ultrasound demonstrated epithelial thickness within normal limits in the left eye. Advanced diagnostic methods along with clinical data enable the distinction from unilateral ectasia cases and subclinical (fruste) keratoconus. Literature review is also performed along with case presentation and discussion. How to cite this article Ramos IC, Reinstein DZ, Archer TJ, Gobbe M, Salomão MQ, Lopes B, Luz A, Faria-Correia F, Gatinel D, Belin MW, Ambrósio R Jr. Unilateral Ectasia characterized by Advanced Diagnostic Tests. Int J Kerat Ect Cor Dis 2016;5(1):40-51.

scholarly journals Case Report of Myopia Correction by ReLEx SMILE in a Patient with Superficial Corneal Opacity

2020 ◽  
Vol 17 (2) ◽  
pp. 295-299
Author(s):  
N. V. Maychuk ◽  
I. A. Mushkova ◽  
A. M. Mayorova ◽  
A. A. Shpak
Keyword(s):  
Visual Acuity ◽  
Case Report ◽  
Anterior Segment ◽  
Corneal Opacity ◽  
Optical Center ◽  
Interface Zone ◽  
Uncorrected Visual Acuity ◽  
Corneal Opacities ◽  
Different Depths ◽  
The Right

Introduction. Reduced corneal transparency leads to dissipation of energy of the femtosecond laser (FSL), which may complicate the formation of the intrastromal incision and limits the use of FSL in eyes with corneal opacities and scars. The purpose of this work is to demonstrate the possibility of successful ReLEx SMILE in a patient with superficial corneal opacity located in the paracentral zone. Case report. Patient R., 29 years old, complained of decreased vision in both eyes since childhood. Visual acuity OD = 0.1 sph –2.75D = 1.0; OS = 0.1 sph –3.50 D cyl –0.75D ax 165° = 1.0. Biomicroscopy of the right eye visualized a superficial semi-transparent corneal opacity of 5 x 3 mm located at 5.30–6 hours at a distance of 1.3 mm from the optical center. According to the anterior segment optical coherence tomography (AS-OCT) the depth of the opacity was 73–78 microns and was limited by the Bowman’s membrane. ReLEx SMILE for myopia correction was performed on both eyes with 6.7 mm lenticule diameter at a depth of 120 µm, which covered the opacity area by 1.1 mm. The surgery was standard and uncomplicated. Seven days postoperatively the patient did not complain. Uncorrected visual acuity (UCVA) was 1.0 for both eyes (and binocularly it was 1.2). According to the AS-OCT data, a hyperreflective line of the interface zone was visualized on the right eye at the depth of 141–147 µm; the opacified superficial corneal layers were detected in the lower paracental zone over the interface line. In one month after the surgery the visual acuity did not change: UCVA = 1.0 in both eyes (binocularly 1.2). Conclusion. ReLEx SMILE technology can be considered as one of the options for myopia correction in patients with superficial corneal opacity located in the paracental zone. More observations are required to evaluate the effectiveness of this technology on corneas with paracentral opacities different in sizes and located at different depths.

scholarly journals Outcomes of LASIK for Myopia or Myopic Astigmatism Correction with the FS200 Femtosecond Laser and EX500 Excimer Laser Platform

2018 ◽  
Vol 12 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Muanploy Niparugs ◽  
Napaporn Tananuvat ◽  
Winai Chaidaroon ◽  
Chulaluck Tangmonkongvoragul ◽  
Somsanguan Ausayakhun
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Excimer Laser ◽  
Clinical Results ◽  
Laser In Situ Keratomileusis ◽  
Distance Visual Acuity ◽  
Astigmatism Correction ◽  
Full Correction ◽  
One Year ◽  
Myopic Astigmatism

Purpose: To evaluate the efficacy, predictability, stability and safety of laser in situ keratomileusis (LASIK) using the FS200 femtosecond laser and EX500 excimer laser platform. Methods: The outcomes of 254 eyes of 129 consecutive patients with myopia or myopic astigmatism who underwent full correction femtosecond laser-assisted LASIK at CMU LASIK Center were assessed. Pre-operative and post-operative parameters including manifest refraction, Uncorrected Distance Visual Acuity (UDVA), Best Corrected Distance Visual Acuity (BDVA), corneal topography and tomography were analyzed. The results between low to moderate myopia and high myopia were compared up to 12 months. Results: Mean pre-operative Spherical Equivalent (SE) was -5.15±2.41 Diopters (D) (range -0.50 to -11.50 D) and -0.13±0.28 D, -0.13±0.27 D, -0.13±0.28 D and -0.14±0.30 D at 1, 3, 6, and 12 months, post-operatively. At 12 months, the propor¬tion of eyes achieving UDVA ≥ 20/20 was 90.0% and ≥20/40 was 98.8%. The proportion of eyes achieving post-operative mean SE ±0.5 D, and ±1 D was 91.3%, and 98.5%. No eyes lost more than two lines of BDVA. The low to moderate myopic group had a statistically significant better UDVA at one (p=0.017) and three months (p=0.014) but no difference at six (p=0.061) and 12 months (p=0.091). The mean post-operative SE was better in low to moderate myopic group at every follow-up visit (p=0.001, 0.007, <0.001 and <0.001). Conclusion: One-year clinical results of LASIK with the FS200 femtosecond laser and EX500 excimer laser showed high efficacy, predictability, stability and safety.

scholarly journals Comparison of outcomes after topography-modified refraction versus wavefront-optimized versus manifest topography-guided LASIK

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Jaeryung Kim ◽  
Sung-Ho Choi ◽  
Dong Hui Lim ◽  
Gil-Joong Yoon ◽  
Tae-Young Chung
Keyword(s):  
Visual Acuity ◽  
Vector Analysis ◽  
Laser In Situ Keratomileusis ◽  
Distance Visual Acuity ◽  
Postoperative Astigmatism ◽  
Uncorrected Distance Visual Acuity ◽  
Manifest Refraction ◽  
Corrected Distance Visual Acuity ◽  
Myopic Astigmatism

Abstract Background To compare the outcomes of myopia and myopic astigmatism corrected with topography-modified refraction laser in situ keratomileusis (TMR-LASIK), wavefront-optimized (WFO) LASIK, and topography-guided (TG) LASIK with a correction target based on the manifest refraction (manifest TG-LASIK). Methods This observational, retrospective cohort study included patients who underwent LASIK using the WaveLight® EX500 excimer laser to correct myopia and myopic astigmatism between August 2016 and July 2017. Patients who underwent TMR-LASIK (85 patients), WFO-LASIK (70 patients), or manifest TG-LASIK (40 patients) were enrolled, and only one eye from each patient was analyzed. All participants underwent measurement of the uncorrected distance visual acuity (UDVA), best-corrected distance visual acuity (BCVA), manifest refraction, vector analysis of astigmatic change, corneal topography, and corneal wavefront analysis at baseline and at every posttreatment visit. Results Three months postoperatively, a UDVA of 0.0 logMAR or better and manifest refraction spherical equivalent (MRSE) within ±0.5 diopters (D) did not differ across the TMR-, WFO-, and manifest TG-LASIK groups. However, the residual cylinder in the TMR group was significantly larger than that in the WFO and manifest TG groups. The magnitude of error in the TMR group measured using astigmatism vector analysis was significantly higher than that in the WFO and manifest TG groups. Conclusions Although these three LASIK platforms achieved the predicted surgical outcomes, TMR-LASIK overcorrected astigmatism and showed a higher residual postoperative astigmatism compared with WFO- and manifest TG-LASIK.

scholarly journals Femtosecond laser-assisted cataract surgery compared with phacoemulsification: the FACT non-inferiority RCT

2021 ◽  
Vol 25 (6) ◽  
pp. 1-68
Author(s):  
Alexander C Day ◽  
Jennifer M Burr ◽  
Kate Bennett ◽  
Rachael Hunter ◽  
Catey Bunce ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Standard Deviation ◽  
Confidence Interval ◽  
Femtosecond Laser ◽  
Cataract Surgery ◽  
Distance Visual Acuity ◽  
Uncorrected Distance Visual Acuity ◽  
Corrected Distance Visual Acuity ◽  
The Mean

Background Cataract surgery is one of the most common operations. Femtosecond laser-assisted cataract surgery (FLACS) is a technique that automates a number of operative steps. Objectives To compare FLACS with phacoemulsification cataract surgery (PCS). Design Multicentre, outcome-masked, randomised controlled non-inferiority trial. Setting Three collaborating NHS hospitals. Participants A total of 785 patients with age-related cataract in one or both eyes were randomised between May 2015 and September 2017. Intervention FLACS (n = 392 participants) or PCS (n = 393 participants). Main outcome measures The primary outcome was uncorrected distance visual acuity in the study eye after 3 months, expressed as the logarithm of the minimum angle of resolution (logMAR): 0.00 logMAR (or 6/6 if expressed in Snellen) is normal (good visual acuity). Secondary outcomes included corrected distance visual acuity, refractive outcomes (within 0.5 dioptre and 1.0 dioptre of target), safety and patient-reported outcome measures at 3 and 12 months, and resource use. All trial follow-ups were performed by optometrists who were masked to the trial intervention. Results A total of 353 (90%) participants allocated to the FLACS arm and 317 (81%) participants allocated to the PCS arm attended follow-up at 3 months. The mean uncorrected distance visual acuity was similar in both treatment arms [0.13 logMAR, standard deviation 0.23 logMAR, for FLACS, vs. 0.14 logMAR, standard deviation 0.27 logMAR, for PCS, with a difference of –0.01 logMAR (95% confidence interval –0.05 to 0.03 logMAR; p = 0.63)]. The mean corrected distance visual acuity values were again similar in both treatment arms (–0.01 logMAR, standard deviation 0.19 logMAR FLACS vs. 0.01 logMAR, standard deviation 0.21 logMAR PCS; p = 0.34). There were two posterior capsule tears in the PCS arm. There were no significant differences between the treatment arms for any secondary outcome at 3 months. At 12 months, the mean uncorrected distance visual acuity was 0.14 logMAR (standard deviation 0.22 logMAR) for FLACS and 0.17 logMAR (standard deviation 0.25 logMAR) for PCS, with a difference between the treatment arms of –0.03 logMAR (95% confidence interval –0.06 to 0.01 logMAR; p = 0.17). The mean corrected distance visual acuity was 0.003 logMAR (standard deviation 0.18 logMAR) for FLACS and 0.03 logMAR (standard deviation 0.23 logMAR) for PCS, with a difference of –0.03 logMAR (95% confidence interval –0.06 to 0.01 logMAR; p = 0.11). There were no significant differences between the arms for any other outcomes, with the exception of the mean binocular corrected distance visual acuity with a difference of –0.02 logMAR (95% confidence interval –0.05 to 0.00 logMAR) (p = 0.036), which favoured FLACS. There were no significant differences between the arms for any health, social care or societal costs. For the economic evaluation, the mean cost difference was £167.62 per patient higher for FLACS (95% of iterations between –£14.12 and £341.67) than for PCS. The mean QALY difference (FLACS minus PCS) was 0.001 (95% of iterations between –0.011 and 0.015), which equates to an incremental cost-effectiveness ratio (cost difference divided by QALY difference) of £167,620. Limitations Although the measurement of outcomes was carried out by optometrists who were masked to the treatment arm, the participants were not masked. Conclusions The evidence suggests that FLACS is not inferior to PCS in terms of vision after 3 months’ follow-up, and there were no significant differences in patient-reported health and safety outcomes after 12 months’ follow-up. In addition, the statistically significant difference in binocular corrected distance visual acuity was not clinically significant. FLACS is not cost-effective. Future work To explore the possible differences in vision in patients without ocular co-pathology. Trial registration Current Controlled Trials ISRCTN77602616. Funding This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 25, No. 6. See the NIHR Journals Library website for further project information. Moorfields Eye Charity (grant references GR000233 and GR000449 for the endothelial cell counter and femtosecond laser used).

scholarly journals Corneal Spherical Aberration and Corneal Asphericity after Small Incision Lenticule Extraction and Femtosecond Laser-Assisted LASIK

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Hui Zhang ◽  
Yan Wang ◽  
Hua Li
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Spherical Aberration ◽  
Laser In Situ Keratomileusis ◽  
Anterior Surface ◽  
Small Incision Lenticule Extraction ◽  
Distance Visual Acuity ◽  
Small Incision ◽  
Corneal Asphericity ◽  
Lenticule Extraction

Purpose. To investigate corneal spherical aberration and corneal asphericity after small incision lenticule extraction (SMILE) and femtosecond laser-assisted laser in situ keratomileusis (FS-LASIK). Methods. This study enrolled 70 patients having SMILE and 64 subjects receiving FS-LASIK. The preoperative spherical equivalent (SE) was −5.83 ± 1.23 diopters (D) and −6.20 ± 1.52 D, respectively. The uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), SE, corneal spherical aberration, and asphericity over the 6.0 mm cornea were evaluated preoperatively and postoperatively. Results. At 6 months, the UDVA, CDVA, and SE were −0.12 ± 0.11, −0.05 ± 0.05, and −0.16 ± 0.19 D in SMILE and −0.10 ± 0.06, −0.03 ± 0.06, and −0.08 ± 0.25 D in FS-LASIK. There was no difference between groups in the postoperative UDVA, CDVA, or SE (P>0.05). SMILE showed lower inductions of spherical aberration along the anterior surface and the total cornea and less increases in corneal asphericity of the anterior surface postoperatively than FS-LASIK (P<0.01). There were significant correlations between the changes in spherical aberration and corneal asphericity (P<0.001). Conclusions. SMILE and FS-LASIK exhibited excellent visual results and refractive outcomes. SMILE induced less increase in corneal spherical aberration and better preserved the corneal asphericity of the anterior corneal surface than FS-LASIK. Corneal asphericity changes contributed to the corneal spherical aberration changes following SMILE and FS-LASIK.

scholarly journals Comparison of Visual Outcomes for Myopia after Refractive Surgery using Femtosecond Laser-Assisted and Flap-off Epi-LASIK

2020 ◽  
Author(s):  
JUNJIE PIAO ◽  
Woong-Joo Whang ◽  
Choun-Ki Joo
Keyword(s):  
Visual Acuity ◽  
Femtosecond Laser ◽  
Refractive Surgery ◽  
Distance Visual Acuity ◽  
Visual Outcomes ◽  
Uncorrected Distance Visual Acuity ◽  
Significant Difference ◽  
Manifest Refraction ◽  
Corrected Distance Visual Acuity ◽  
Corneal Asphericity

Abstract Background This study clinically evaluated the visual outcomes after refractive surgery for myopia using femtosecond laser-assisted in situ keratomileusis (femto-LASIK) and epi-LASIK (flap-off). Methods In this prospective cohort study, 40 eyes of 27 patients were divided into two groups depending on the technique used for refractive surgery. Femto-LASIK flaps and epi-LASIK flaps (flap-off) were created using femtosecond laser and Epi-K TM epikeratome, respectively. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction (MR), corneal asphericity (Q-value), and corneal higher-order aberrations (HOAs) were assessed pre- and postoperatively. Results The improvement in LogMAR UDVA after refractive surgery was statistically significant for both groups ( P < 0.001 for all groups); it was significantly improved in the femto-LASIK group, 1 day and 1 week postoperatively ( P < 0.001, P = 0.019, respectively). With regard to the front and total corneal HOAs, there were significant differences in spherical aberrations (Z 4,0 ) between the femto-LASIK and flap-off epi-LASIK groups ( P = 0.016 and P = 0.017, respectively). With regard to the back corneal HOAs, there were significant differences in vertical coma (Z 3,-1 ) aberration, 0.027 ± 0.027 μm (femto-LASIK) and 0.001 ± 0.034 μm (flap-off epipolis LASIK); horizontal secondary astigmatism (Z 4,2 ) aberration, -0.008 ± 0.012 μm (femto-LASIK) and 0.007 ± 0.018 μm (flap-off epipolis LASIK); oblique tetrafoil (Z 4,-4 ) aberration, -0.008 ± 0.029 μm (femto-LASIK) and 0.015 ± 0.026 μm (flap-off epi-LASIK), respectively ( P = 0.018, P = 0.007, and P = 0.022, respectively). However, the back corneal HOA changes did not have a significant effect on the total corneal HOA changes. Conclusion Femto-LASIK yielded better early visual outcomes than did flap-off epi-LASIK, but there was no significant difference between the outcomes of the two procedures, 1 week postoperatively.

Sign in / Sign up

Export Citation Format

Share Document