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Astigmatic keratotomy

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
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
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
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...
May 6, 2016: Acta Ophthalmologica
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
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
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
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
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
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
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
Riad B Shalash, Malak I Elshazly, Marwa M Salama
PURPOSE: To evaluate a new technique combining intrastromal astigmatic keratotomy (AK) with a laser in situ keratomileusis (LASIK) flap followed by excimer laser photoablation to correct post-penetrating keratoplasty (PKP) high astigmatism and ametropia. SETTING: Kasr El Aini Hospital, Cairo University, Cairo, Egypt. DESIGN: Prospective interventional uncontrolled case series. METHODS: Patients with post-PKP high astigmatism and ametropia had paired intrastromal AK with LASIK flap using the M2 microkeratome followed 2 to 3 months later by excimer laser photoablation...
October 2015: Journal of Cataract and Refractive Surgery
Omer Trivizki, Eliya Levinger, Samuel Levinger
PURPOSE: To evaluate the refractive and keratometric effect of arcuate keratotomy using femtosecond technology in patients with high post-keratoplasty astigmatism with a mushroom profile. SETTING: Enaim Refractive Center, Tel-Aviv, Israel. DESIGN: Noncomparative prospective interventional case series. METHODS: The arcuate depth incision was set to 80% of the minimal graft thickness, with a 60-degree angle. The mean diameter was 5...
September 2015: Journal of Cataract and Refractive Surgery
Huseyin Bayramlar, Remzi Karadag, Ozgur Cakici, Isilay Ozsoy
PURPOSE: To evaluate the effectiveness and predictability of arcuate keratotomy (AK) for post-keratoplasty astigmatism and to present the complications and rate of repeat procedures. METHODS: Sixteen eyes from 14 patients were included. Paired 70-80° arc length AKs centred on the steep axis were carried out 0.5 mm within the graft-host junction. The depth of the AKs was set at approximately 80-90% of the depth of the cornea, based on a topographic pachymeter at the incision location...
June 2016: British Journal of Ophthalmology
Timothy Y Chou, Azin Abazari, Alexander Barash, Shetal Shah, Kevin Kaplowitz
UNLABELLED: A 79-year-old woman had uneventful femtosecond laser-assisted cataract surgery including paired laser astigmatic keratotomies (AKs) in the right eye. Three weeks postoperatively, a corneal infiltrate developed in the superotemporal AK incision. Cultures grew methicillin-resistant Staphylococcus aureus. The infection was treated with topical fortified vancomycin and tobramycin; full resolution required several months of therapy. Five months after cataract surgery, the patient presented with a second stromal infiltrate, also in the superotemporal AK incision...
August 2015: Journal of Cataract and Refractive Surgery
Bu Ki Kim, Su Joung Mun, Dae Gyu Lee, Jae Ryun Kim, Hyun Seung Kim, Young Taek Chung
PURPOSE: To explore the clinical effects of combined full-thickness astigmatic keratotomy and small-incision lenticule extraction (SMILE) in patients who are inoperable using SMILE alone. METHODS: We included 13 eyes of 9 patients with high-level or mixed astigmatism who underwent full-thickness astigmatic keratotomy followed by SMILE (secondarily) to correct the residual refractive error. RESULTS: Six months after SMILE, the spherical equivalent was reduced from -4...
December 2015: Cornea
Aeri Yoo, Samyoung Yun, Jae Yong Kim, Myoung Joon Kim, Hungwon Tchah
PURPOSE: To evaluate the clinical efficacy and safety of femtosecond laser-assisted arcuate keratotomy (FS-AK) versus toric intraocular lens (IOL) implantation for correcting astigmatism in patients with cataract. METHODS: A retrospective chart review was performed. All patients had senile cataracts with corneal astigmatism (range: +1.00 to +3.00 diopters [D]) before cataract surgery. Twenty-five patients agreed to undergo toric IOL implantation (the toric IOL group)...
September 2015: Journal of Refractive Surgery
Ali Fadlallah, Chadi Mehanna, Jean-Jacques Saragoussi, Elias Chelala, Belkacem Amari, Jean-Marc Legeais
PURPOSE: To determine the refractive efficacy, predictability, stability, and complication rate of Intralase femtosecond laser-assisted astigmatic keratotomy (AK) for irregular astigmatism after penetrating keratoplasty (PKP). SETTING: Ophthalmology Department, Hôtel-Dieu, Paris, France. DESIGN: Retrospective case series. METHODS: Femtosecond laser-assisted AK was performed to treat high irregular astigmatism (>5...
June 2015: Journal of Cataract and Refractive Surgery
Patrick Loriaut, Vincent M Borderie, Laurent Laroche
PURPOSE: To assess the clinical and refractive outcomes of femtosecond-assisted arcuate keratotomy in postkeratoplasty patients, and the accuracy of the incisions, using optical coherence tomography. METHODS: This is a retrospective study of patients with high postkeratoplasty astigmatism. Patients with a minimum of 4 diopters (D) of postkeratoplasty regular astigmatism were included. The main outcome measures were corrected distance visual acuity, keratometry, corneal topography, and the depth of corneal incisions...
September 2015: Cornea
Li Wang, Hart Moss, Bruna V Ventura, Henrique Padilha, Christian Hester, Douglas D Koch
PURPOSE: The objective of this study was to review advances in the field of refractive surgery as reported in the peer-reviewed literature over the previous year. DESIGN: This was a literature review. METHODS: We conducted a PubMed search for terms related to refractive surgery and reviewed prominent international ophthalmic journals published from May 2012 through April 2013. All pertinent articles were reviewed, and selected articles with the greatest relevance were included...
September 2013: Asia-Pacific Journal of Ophthalmology
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