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lenticule extraction

Tommy C Y Chan, Yan Wang, Alex L K Ng, Jiamei Zhang, Marco C Y Yu, Vishal Jhanji, George P M Cheng
PURPOSE: To compare the astigmatic correction in high myopic astigmatism between small-incision lenticule extraction and laser in situ keratomileusis (LASIK) using vector analysis. SETTING: Hong Kong Laser Eye Center, Hong Kong. DESIGN: Retrospective case series. METHODS: Patients who had correction of myopic astigmatism of 3.0 diopters (D) or more and had either small-incision lenticule extraction or femtosecond laser-assisted LASIK were included...
June 13, 2018: Journal of Cataract and Refractive Surgery
Bogdan Spiru, Sabine Kling, Farhad Hafezi, Walter Sekundo
PURPOSE: To investigate the biomechanical properties of the ex vivo human cornea after flap-based versus cap-based laser refractive surgery in the same donor. METHODS: In this experimental study, 11 pairs of human corneas unsuitable for transplantation were equally divided into two groups. Corneas from the right eye were treated with femtosecond laser-assisted LASIK (FSLASIK) and corneas from the left eye with small incision lenticule extraction (SMILE). Pachymetry was measured in each eye directly before laser refractive surgery...
June 1, 2018: Journal of Refractive Surgery
Nikolaus Luft, Ricarda G Schumann, Martin Dirisamer, Daniel Kook, Jakob Siedlecki, Christian Wertheimer, Siegfried G Priglinger, Wolfgang J Mayer
PURPOSE: To assess the wound healing, inflammation, and tissue ultrastructure in the human corneal stroma after small incision lenticule extraction (SMILE) and femtosecond laser-assisted LASIK (FS-LASIK). METHODS: Sixteen corneoscleral discs of 16 human donors unsuitable for corneal transplantation were obtained from an eye bank. Eight eyes underwent SMILE with -5.00 diopters (D) of myopic correction; in 3 of them the lenticule was not extracted. Further 5 donor corneas were subjected to FS-LASIK with -5...
June 1, 2018: Journal of Refractive Surgery
Huamao Miao, Xiu Liu, Mi Tian, Jing Zhao, Xuejun Fang, Xingtao Zhou
PURPOSE: To investigate changes in intraocular scattering and Bowman's layer microdistortions after femtosecond laser small incision lenticule extraction using the continuous curvilinear lenticulerhexis technique (SMILE-CCL). METHODS: In this prospective study, 93 eyes of 93 patients (44 women, 49 men) were treated with SMILE-CCL. Mean age was 26.09 ± 4.39 years and mean spherical equivalent was -6.31 ± 2.16 diopters. The Objective Scatter Index (OSI) was examined with an objective optical quality analysis system...
June 1, 2018: Journal of Refractive Surgery
Alastair Stuart, Dan Z Reinstein, Ryan S Vida, Timothy J Archer, Glenn Carp
We describe a case of atypical diffuse lamellar keratitis (DLK) following small-incision lenticule extraction (SMILE). The patient presented with multiple focal white infiltrates 1 day after routine small-incision lenticule extraction surgery. An interface washout was performed, and the patient was managed with intensive topical steroids. Potential infectious keratitis was also investigated (by culture and Gram stain) and treated aggressively with steroids and antibiotics. The cultures were all negative with no growth, and the focal infiltrates gradually resolved, with no relapses at the 15-month postoperative follow-up and a faint 0...
June 6, 2018: Journal of Cataract and Refractive Surgery
Yaoqi Xiang, Min Shen, Chao Xue, Di Wu, Yan Wang
The biomechanical behavior of human corneal stroma under uniaxial tension was investigated by the experimental analysis of cornea stromal lenticules taken out by corneal refractive surgery. Uniaxial tests were conducted to determine their stress-strain relationship and tensile strength. The Gasser-Ogden-Holzapfel (GOH) model was used to describe biomechanical behavior of the corneal stroma. The theoretical stress-strain relationship of the GOH model in the uniaxial tensile test was deduced. The corneal specimens were collected from ten patients (4 male and 6 female), aged from 17 to 36...
May 30, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Wenbo Cheng, Lingjia Liu, Shasha Yu, Yin Jing, Tong Zuo, Tong Cui, Hui Zhang, Jiaonan Ma, Pinghui Wei, Weiting Hao, Alex Ng, George Cheng, Victor Woo, Kin Chiu, Yan Wang
PURPOSE: To investigate real-time intraocular pressure (IOP) during small incision lenticule extraction (SMILE) in rabbit eyes for myopia correction. METHODS: During SMILE, real-time IOP was measured in the vitreous cavity of rabbit eyes with an optic fiber pressure sensor (OFPS). Two groups (n = 6 for each) underwent surgery, one group for a -2.00 diopter (D) refractive spherical correction and the other for a -6.00 D correction. RESULTS: During surgery, the IOP increased once the glass contact attached to the cornea (Pre-suction), and peaked 83...
June 6, 2018: Current Eye Research
Jiaonan Ma, Yan Wang, Tommy C Y Chan
PURPOSE: To investigate the possible risk factors and clinical effects of black areas in small-incision lenticule extraction. METHODS: Thirty-one cases and 126 controls were enrolled in a case-control study from the database of a single center from September 2012 to July 2017. A retrospective analysis of surgical procedures with video and medical records was performed. Logistic regression analysis was used to assess the possible risk factors for black areas between cases with black areas and controls without black areas...
May 31, 2018: Cornea
Iben Bach Damgaard, Andri Kartasasmita Riau, Yu-Chi Liu, Min Li Tey, Gary Hin-Fai Yam, Jodhbir Singh Mehta
Purpose: To evaluate the feasibility of excimer laser reshaping of biological lenticules available after small incision lenticule extraction (SMILE). Methods: Fresh and cryopreserved SMILE-derived human lenticules underwent excimer laser ablation for stromal reshaping. The treatment effects in the lasered group were compared with the nonlasered group with respect to changes in surface functional groups (by Fourier transform infrared spectroscopy [FTIR]) and surface morphology (by scanning electron microscopy [SEM] and atomic force microscopy [AFM])...
May 1, 2018: Investigative Ophthalmology & Visual Science
Hun Lee, Cynthia J Roberts, Samuel Arba-Mosquera, David Sung Yong Kang, Dan Z Reinstein, Tae-Im Kim
Purpose: To investigate the amount of lenticule decentration following small-incision lenticule extraction (SMILE) by using the Keratron Scout tangential topography difference map, and the relationship between the magnitudes of total decentration and induced corneal higher-order aberrations (HOAs). Methods: This retrospective observational case series study analyzed decentration values obtained from the Keratron Scout tangential topography difference map of 360 eyes (360 patients) that underwent SMILE...
May 1, 2018: Investigative Ophthalmology & Visual Science
Mohamed Nagy Elmohamady, Walid Abdelghaffar, Ahmed Daifalla, Tamer Salem
Purpose: To evaluate femtosecond laser in flap and cap creation, detect some corneal biomechanical changes, and evaluate dry eye after laser in situ keratomileusis (LASIK), Femto-LASIK, and small incision lenticule extraction (SMILE) with 3-year follow-up. Patients and methods: Preoperative evaluation taken: full ophthalmic examination, Pentacam, ocular response analyzer, ocular surface disease index (OSDI), and tear breakup time (TBUT). LASIK flap was created using Moria microkeratome in 30 eyes (LASIK group) and using VisuMax femtosecond laser in 38 eyes (FS-LASIK group) and SMILE was done by VisuMax in 35 eyes (SMILE group)...
2018: Clinical Ophthalmology
Hun Lee, David Sung Yong Kang, Dan Z Reinstein, Samuel Arba-Mosquera, Eung Kweon Kim, Kyoung Yul Seo, Tae-Im Kim
PURPOSE: To evaluate the changes in corneal higher-order aberrations (HOAs) after corneal wavefront-guided transepithelial photorefractive keratectomy (PRK) and small-incision lenticule extraction (SMILE). SETTING: Yonsei University College of Medicine and Eyereum Eye Clinic, South Korea. DESIGN: Retrospective case series. METHODS: Medical records of patients having either corneal wavefront-guided transepithelial PRK or small-incision lenticule extraction were examined...
May 19, 2018: Journal of Cataract and Refractive Surgery
Takahiro Kataoka, Tomoya Nishida, Azusa Murata, Mayuka Ito, Naoki Isogai, Rie Horai, Takashi Kojima, Yoko Yoshida, Tomoaki Nakamura
Purpose: This retrospective case-matched study aimed to compare visual and refractive outcomes between small incision lenticule extraction (SMILE) and LASIK. Patients and methods: Patients who underwent SMILE (34 eyes of 23 patients) or LASIK (34 eyes of 24 patients) were enrolled and matched according to preoperative manifest refractive spherical equivalents. The mean preoperative manifest refractive spherical equivalent was -4.69±0.6 and -4.67±0.64 D in the SMILE and LASIK groups, respectively...
2018: Clinical Ophthalmology
Ronald R Krueger, Caio S Meister
PURPOSE OF REVIEW: As a flapless procedure, SMILE brings benefits to refractive surgery, such as lower corneal biomechanical impact, less dry eye risk and less stromal bed exposure. However, the longer learning curve can be a risk factor for complications. This article aims to discuss SMILE complications and proposes a categorized analysis of occurrences, dividing into two groups: intraoperative and postoperative complications. Among intraoperative, we also suggest a subdivision between those related to the laser (lenticule construction), tissue separation (lenticule dissection) and tissue removal (lenticule extraction)...
July 2018: Current Opinion in Ophthalmology
J Burazovitch, H Ferguene, D Naguszewski
OBJECTIVE: Determine if the visual criteria of the technique of surgery refractive by Femtosecond Laser-assisted duckweed Extraction - Small Lenticule Extraction (FLEx-Smile® ), realized in the laser femtosecond VisuMax® (Carl Zeiss Meditec, Jena, Germany), are stable, secure, effective and predictable in the long term, to the nearsighted and astigmatic. MODEL OF THE STUDY: Retrospective study, monocentric with data collected between March 2012 and March 2017...
May 2018: Journal Français D'ophtalmologie
Haris Sideroudi, Apostolos Lazaridis, Anke Messerschmidt-Roth, Georgios Labiris, Vassilios Kozobolis, Walter Sekundo
PURPOSE: To evaluate the long-term changes in anterior and posterior corneal irregular astigmatism and curvatures after small incision lenticule extraction (SMILE). METHODS: Fifty eyes of 28 patients underwent SMILE for myopic astigmatism. All procedures were performed using the VisuMax® femtosecond laser. A Scheimpflug camera was used for preoperative and 3-year postoperative tomography. Anterior and posterior corneal Fourier parameters (spherical component, regular astigmatism, asymmetry, and irregularity) and curvature data were evaluated and compared within 2 subgroups according to the magnitude of the refractive correction (low myopia group: spherical equivalent (SEQ) ≥ -6 D; high myopia group: (SEQ) < -6 D)...
July 2018: Cornea
Anastasios John Kanellopoulos
No abstract text is available yet for this article.
May 10, 2018: Ophthalmology
Meiyan Li, Feng Zhao, Meng Li, Michael C Knorz, Xingtao Zhou
PURPOSE: To describe a case in which post-LASIK corneal ectasia was treated using an allogeneic lenticule implanted into the recipient eye. METHODS: A 29-year-old man presented with bilateral ectasia 10 years after LASIK. Manifest refraction was -1.50 -3.25 × 15° in the right eye and -13.50 -6.00 × 10° in the left eye. Because of contact lens intolerance in the left eye, the authors decided to implant an allogenic corneal lenticule, created by small incision lenticule extraction with the VisuMax laser (Carl Zeiss Meditec, Jena, Germany) in a donor eye with a refraction of +5...
May 1, 2018: Journal of Refractive Surgery
Jakob Siedlecki, Nikolaus Luft, Wolfgang J Mayer, Martin Siedlecki, Daniel Kook, Bertram Meyer, Martin Bechmann, Rainer Wiltfang, Siegfried G Priglinger, Martin Dirisamer
PURPOSE: To report the outcomes of enhancement after small incision lenticule extraction (SMILE) using the VisuMax CIRCLE option (Carl Zeiss Meditec AG, Jena, Germany), which converts the SMILE cap into a femtosecond LASIK flap for secondary excimer laser application. METHODS: Of 2,065 SMILE procedures, 22 eyes (1.1%) re-treated with CIRCLE with a follow-up of 3 months were included in the analysis. SMILE was performed in the usual manner. For re-treatment, the CIRCLE procedure was performed with pattern D flap creation on the VisuMax system and subsequent excimer laser ablation with a Zeiss MEL 90 laser (Carl Zeiss Meditec) with plano target in all cases...
May 1, 2018: Journal of Refractive Surgery
Abdallah Mahrous, Jessica B Ciralsky, Edward C Lai
PURPOSE OF REVIEW: Presbyopia is an inevitable age-related loss of accommodation that results in spectacle dependence with common everyday near-vision tasks. Many surgical approaches to presbyopic correction have been investigated, with monovision correction being amongst the most common and attractive options. In this article, we will review the advantages and disadvantages of the new modalities of presbyopic monovision correction. RECENT FINDINGS: New methods such as mini-monovision, corneal inlays, and multifocal corneal ablation aim to maximize stereopsis and decrease the anisometropic side effects of conventional monovision...
July 2018: Current Opinion in Ophthalmology
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