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Astigmatic keratotomy

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https://www.readbyqxmd.com/read/28780779/femtosecond-lasers-and-corneal-surgical-procedures
#1
Gustavo K Marino, Marcony R Santhiago, Steven E Wilson
Our purpose is to present a broad review about the principles, early history, evolution, applications, and complications of femtosecond lasers used in refractive and nonrefractive corneal surgical procedures. Femtosecond laser technology added not only safety, precision, and reproducibility to established corneal surgical procedures such as laser in situ keratomileusis (LASIK) and astigmatic keratotomy, but it also introduced new promising concepts such as the intrastromal lenticule procedures with refractive lenticule extraction (ReLEx)...
July 31, 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28730124/cataract-surgery-on-post-radial-keratotomy-patients
#2
Alessandro Meduri, Mario Urso, Giuseppe A Signorino, Miguel Rechichi, Cosimo Mazzotta, Stephen Kaufman
This study aims to evaluate and to compare three different approaches of cataract surgery to patients with previous radial keratotomy (RK), and to analyze the mechanical properties of the cornea after cataract surgery. Three groups of patients, each one including 8 eyes of patients with 16 RK incisions. The first group includes eyes with the first cataract incision superiorly, the second group in the temporal area, the third group in temporal area and a precautionary stabilizing suture across the RK incision adjacent to the main tunnel...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28648990/a-numerical-experimental-protocol-to-characterize-corneal-tissue-with-an-application-to-predict-astigmatic-keratotomy-surgery
#3
M Á Ariza-Gracia, Á Ortillés, J Á Cristóbal, J F Rodríguez Matas, B Calvo
Tonometers are intended to determine the intraocular pressure (IOP) and the quality of corneal tissue. In contrast to the physiological state of stress of the cornea, tonometers induce non-physiological bending stress. Recently, the use of a single experiment to calibrate a set of corneal mechanical properties was suggested to be an ill-posed problem. Thus, we propose a numerical-experimental protocol that uses inflation and indentation experiments simultaneously, restricting the optimization space to circumvent the ambiguity of the fitting...
June 15, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28581285/long-term-stability-of-minimally-invasive-radial-keratotomy-for-mild-to-moderate-keratoconus
#4
Kahoko Fujimoto, Hideya Osawa, Takashi Moriyama, T Miyamoto, Tomomi Irie, Tetsuya Nishimura, Tomoyuki Inoue
PURPOSE: This study aimed to evaluate the long-term stability of minimally invasive radial keratotomy (mini-RK) for eyes with mild to moderate keratoconus. DESIGN: Retrospective observational case series. METHODS: Eleven eyes from 6 patients with hard contact lens (HCL)-intolerant keratoconus underwent mini-RK and were followed up for more than 5 years. The mini-RK consisted of 8 radial incisions with depths of 90% of the thinnest corneal thickness, based on the Lindstrom nomogram...
April 10, 2017: Asia-Pacific Journal of Ophthalmology
https://www.readbyqxmd.com/read/28549845/tomographic-analysis-of-anterior-and-posterior-and-total-corneal-refractive-power-changes-after-femtosecond-laser-assisted-keratotomy
#5
Franziska Löffler, Myriam Böhm, Michael Herzog, Kerstin Petermann, Thomas Kohnen
PURPOSE: To analyze the effect of penetrating femtosecond laser-assisted keratotomy (pFLAK) during laser lens surgery on anterior and posterior corneal astigmatism and total corneal refractive power (TCRP) astigmatism (CAant, CApost, CATCRP) measured with Scheimpflug tomography. DESIGN: Prospective, interventional case series. METHODS: This institutional study included 27 eyes of 23 patients (aged 65 ± 8 years) with low-to-moderate CATCRP determined with Scheimpflug tomography (Pentacam HR; Oculus, Wetzlar, Germany) after penetrating femtosecond laser-assisted keratotomy (pFLAK) and laser lens surgery...
August 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28532939/guiding-flying-spot-laser-transepithelial-phototherapeutic-keratectomy-with-optical-coherence-tomography
#6
REVIEW
Yan Li, Hideaki Yokogawa, Maolong Tang, Winston Chamberlain, Xinbo Zhang, David Huang
PURPOSE: To analyze transepithelial phototherapeutic keratectomy (PTK) results using optical coherence tomography (OCT) and develop a model to guide the laser dioptric and depth settings. SETTING: Casey Eye Institute, Portland, Oregon, USA. DESIGN: Prospective nonrandomized case series. METHODS: Patients with superficial corneal opacities and irregularities had transepithelial PTK with a flying-spot excimer laser by combining wide-zone myopic and hyperopic astigmatic ablations...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28458708/femtosecond-laser-arcuate-keratotomy-for-the-correction-of-postkeratoplasty-high-astigmatism-in-keratoconus
#7
Mohammad Naser Hashemian, Habib Ojaghi, Mehrdad Mohammadpour, Mahmoud Jabbarvand, Firouzeh Rahimi, Mohammad-Ali Abtahi, Mehdi Mazloumi, Seyed-Hossein Abtahi
BACKGROUND: Astigmatism is the leading complication in visual recovery after penetrating keratoplasty (PKP) and deep anterior lamellar keratoplasty (DALK); in this study, we evaluated the outcome of femtosecond laser arcuate keratotomy (FLAK) after DALK and PKP in Iranian keratoconic patients. MATERIALS AND METHODS: In this prospective interventional case series, refractive and keratometric predictability, efficacy, and complications of FLAK for postkeratoplasty astigmatism in keratoconus were evaluated; 23 eyes of 23 consecutive patients (mean age of 32...
2017: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/28210176/femtosecond-astigmatic-keratotomy-for-postkeratoplasty-astigmatism
#8
Nasser Al Sabaani, Salem Al Malki, Mohanna Al Jindan, Abdullah Al Assiri, Samar Al Swailem
PURPOSE: To evaluate the initial outcomes of femtosecond laser arcuate keratotomies (AK) to correct high astigmatism after keratoplasty. METHODS: This retrospective non-comparative interventional study included 52 consecutive patients (52 eyes) who underwent Intralase-enabled arcuate keratotomies. Changes in uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BCVA), mean refractive and keratometric astigmatism, preoperative and postoperative manifest refraction and complications were the main outcome measures...
July 2016: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/27992428/outcomes-of-phacoemulsification-using-different-size-of-clear-corneal-incision-in-eyes-with-previous-radial-keratotomy
#9
Jing Shang Zhang, Xue Liu, Jin Da Wang, Ying Xiong, Jing Li, Xiao Xia Li, Jing Zhao, Qi Sheng You, Yao Huang, Frank Tsai, Larry Baum, Vishal Jhanji, Xiu Hua Wan
OBJECTIVE: To evaluate visual outcomes and complications after phacoemulsification in eyes with cataract and previous radial keratotomy (RK) cuts using different sizes of clear corneal incisions. METHODS: The study was a retrospective study. Thirty eyes with cataract and previous RK underwent phacoemulsification and intraocular lens (IOL) implantation. Among them 7 eyes had 8 RK cuts, 13 eyes had 12 RK cuts, and 10 eyes had 16 RK cuts. Phacoemulsification and IOL implantation were performed through a 2...
2016: PloS One
https://www.readbyqxmd.com/read/27647248/-finite-element-analysis-of-astigmatic-keratotomy-based-on-corneal-biomechanical-properties
#10
Z D Li, F J Bao, Q M Wang, J H Huang
OBJECTIVE: To establish a finite-element biomechanical model of astigmatic keratotomy, and to investigate the impact of surgical parameters on corneal deformation, stress distribution and astigmatism correction. METHODS: With Rhinoceros modeling and Abaqus finite element analysis software, a three-dimensional finite-element model of astigmatic cornea was developed, and surgical parameters such as incision optical zone, incision depth and length were varied. Postoperative corneal stress, apical deformation and astigmatism correction were assessed...
September 11, 2016: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/27598735/bilateral-small-incision-lenticule-extraction-smile-after-penetrating-keratoplasty
#11
Bu Ki Kim, Su Joung Mun, Dae Gyu Lee, Young Taek Chung
PURPOSE: To report a case of successful bilateral small incision lenticule extraction (SMILE) performed on a patient who had penetrating keratoplasty and astigmatic keratotomy in the right eye and penetrating keratoplasty in the left eye. METHODS: Case report. RESULTS: Astigmatic keratotomy was used to reduce astigmatism of the right eye because astigmatism was higher than the maximum correction limitation of SMILE. Bilateral SMILE was performed afterward...
August 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27496784/corneal-astigmatism-and-aberrations-after-combined-femtosecond-assisted-phacoemulsification-and-arcuate-keratotomy-two-year-results
#12
Tommy C Y Chan, Alex L K Ng, George P M Cheng, Zheng Wang, Victor C P Woo, Vishal Jhanji
PURPOSE: To investigate the stability of corneal astigmatism and higher-order aberrations after combined femtosecond-assisted phacoemulsification and arcuate keratotomy. DESIGN: Retrospective, interventional case series. METHODS: Surgery was performed using a VICTUS (Bausch & Lomb Inc, Dornach, Germany) platform. A single, 450-μm deep, arcuate keratotomy was paired at the 8-mm zone with the main phacoemulsification incision in the opposite meridian...
October 2016: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/27150121/long-term-follow-up-of-astigmatic-keratotomy-for-corneal-astigmatism-after-penetrating-keratoplasty
#13
Daniel Böhringer, Nina Dineva, Philip Maier, Florian Birnbaum, Thomas Kirschkamp, Thomas Reinhard, Philipp Eberwein
PURPOSE: To report the long-term stability of paired arcuate corneal keratotomies (AKs) in patients with high regular postpenetrating keratoplasty astigmatism. METHODS: Retrospective chart review of best-corrected visual acuity, refraction and keratometric values of 41 eyes with AK between 2003 and 2012. RESULTS: Magnitude of median target induced astigmatism vector was 9.2 dioptres (Dpt). We reached a median magnitude of surgically induced astigmatism vector of 9...
November 2016: Acta Ophthalmologica
https://www.readbyqxmd.com/read/27143847/advances-in-femtosecond-laser-technology
#14
REVIEW
Thais Pinheiro Callou, Renato Garcia, Adriana Mukai, Natalia T Giacomin, Rodrigo Guimarães de Souza, Samir J Bechara
Femtosecond laser technology has become widely adopted by ophthalmic surgeons. The purpose of this study is to discuss applications and advantages of femtosecond lasers over traditional manual techniques, and related unique complications in cataract surgery and corneal refractive surgical procedures, including: LASIK flap creation, intracorneal ring segment implantation, presbyopic treatments, keratoplasty, astigmatic keratotomy, and intrastromal lenticule procedures.
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27138638/infections-after-refractive-surgery
#15
REVIEW
Zeeshan Haq, Asim V Farooq, Andrew J W Huang
PURPOSE OF REVIEW: The purpose of the review is to provide a summary of the recent literature concerning infections after refractive surgery pertinent to each procedure category. RECENT FINDINGS: New data from a large retrospective study suggest that the incidence of post-laser assisted in-situ keratomileusis infectious keratitis is declining. Additionally, recent case studies have reported viral, fungal, and Acanthamoeba pathogens. Corneal collagen cross-linking is emerging as an alternative therapeutic option for early stage post-LASIK infectious keratitis...
July 2016: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/27113878/development-of-a-nomogram-for-femtosecond-laser-astigmatic-keratotomy-for-astigmatism-after-keratoplasty
#16
Ryan M St Clair, Anushree Sharma, David Huang, Fei Yu, Yakov Goldich, David Rootman, Sonia Yoo, Florence Cabot, Jason Jun, Lijun Zhang, Anthony J Aldave
PURPOSE: To develop a nomogram for femtosecond laser astigmatic keratotomy (AK) to treat post-keratoplasty astigmatism. SETTING: Three academic medical centers. DESIGN: Retrospective interventional case series. METHODS: A review of post-keratoplasty femtosecond laser AK was performed. Uncorrected (UDVA) and corrected (CDVA) distance visual acuities, manifest refraction, and keratometry were recorded preoperatively and 1, 3, 6, and 12 months postoperatively...
April 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/27035074/femtosecond-laser-assisted-keratotomy
#17
REVIEW
Laura A Vickers, Preeya K Gupta
PURPOSE OF REVIEW: To review the recent literature on femtosecond laser-assisted astigmatic keratotomy and its applications to naturally occurring as well as postoperative astigmatism in multiple settings. RECENT FINDINGS: Femtosecond laser technology has improved the safety and efficacy of astigmatic keratotomy in the treatment of astigmatism. Intrastromal femtosecond astigmatic keratotomy (ISAK) may have even lower complication rates, though long-term results are still being established...
July 2016: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/27027621/stability-of-keratometric-astigmatism-after-non-penetrating-femtosecond-laser-intrastromal-astigmatic-keratotomy-performed-during-laser-cataract-surgery
#18
COMPARATIVE STUDY
Alexander C Day, Julian D Stevens
PURPOSE: To investigate the stability of keratometric astigmatism after femtosecond laser intrastromal astigmatic keratotomy (ISAK) performed during laser cataract surgery. METHODS: In this prospective comparative case series, data were collected from patients during follow-up 1 and 6 months after laser-assisted cataract surgery. Corneal keratometry was measured preoperatively and postoperatively by Topcon KR8100PA topographer-autorefractor (Topcon Corporation, Tokyo, Japan)...
March 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27026450/predictors-of-femtosecond-laser-intrastromal-astigmatic-keratotomy-efficacy-for-astigmatism-management-in-cataract-surgery
#19
Alexander C Day, Julian D Stevens
PURPOSE: To evaluate the factors associated with the efficacy of femtosecond laser intrastromal astigmatic keratotomy (AK). SETTING: Moorfields Eye Hospital, London, United Kingdom. DESIGN: Prospective case series. METHODS: Eyes having intrastromal AK for corneal cylinder correction were analyzed. Preoperative biometric parameters included axial length, anterior chamber depth, central corneal thickness, and Ocular Response Analyzer corneal hysteresis (CH) and corneal resistance factor (CRF)...
February 2016: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/26948784/nonpenetrating-femtosecond-laser-intrastromal-astigmatic-keratotomy-in-eyes-having-cataract-surgery
#20
Alexander C Day, Nicola M Lau, Julian D Stevens
PURPOSE: To describe the effect of femtosecond laser intrastromal astigmatic keratotomy (AK) performed during cataract surgery. SETTING: Moorfields Eye Hospital, London, United Kingdom. DESIGN: Prospective case series. METHODS: This study comprised patients having laser cataract surgery with concurrent astigmatism management by intrastromal AK. All eyes had greater than 0.7 corneal diopter (D) cylinder. An intrastromal AK nomogram with 8...
January 2016: Journal of Cataract and Refractive Surgery
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