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https://www.readbyqxmd.com/read/29120711/combined-transepithelial-phototherapeutic-keratectomy-and-conventional-photorefractive-keratectomy-followed-simultaneously-by-corneal-crosslinking-for-keratoconus-cretan-protocol-plus
#1
Michael A Grentzelos, George A Kounis, Vasilios F Diakonis, Charalambos S Siganos, Miltiadis K Tsilimbaris, Ioannis G Pallikaris, George D Kymionis
PURPOSE: To evaluate the visual, refractive, and topographic outcomes after combined transepithelial phototherapeutic keratectomy (PTK) and conventional photorefractive keratectomy (PRK) followed simultaneously by corneal crosslinking (CXL) for keratoconus. SETTING: Vardinoyiannion Eye Institute of Crete, Faculty of Medicine, University of Crete, Heraklion, Crete, Greece. DESIGN: Prospective case series. METHODS: Patients with progressive keratoconus had simultaneous conventional PRK followed by CXL; the corneal epithelium was removed using transepithelial PTK (Cretan protocol plus)...
October 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29119072/a-comparison-of-visual-outcomes-and-patient-satisfaction-between-photorefractive-keratectomy-and-femtosecond-laser-assisted-in-situ-keratomileusis
#2
Nauman Hashmani, Sharif Hashmani, Priyanka Ramesh, Hina Rajani, Junaid Ahmed, Jaish Kumar, Arun Kumar, Munira Jamali
Purpose To compare visual outcomes and satisfaction among patients of photorefractive keratectomy (PRK; Wavelight EX 500, Alcon, Ft Worth, TX, USA) and femtosecond laser-assisted in situ keratomileusis (FAL; Wavelight FS 200 laser and Wavelight EX 500, Alcon, Ft Worth, TX, USA). Methods We performed a retrospective study of 409 eyes in 207 patients that underwent either PRK (n=90) or FAL (n=117) at the two centers of Hashmanis Hospital, Karachi, Pakistan. The included refractive outcomes were sphere diopters (D), cylinder D, and spherical equivalent D...
September 1, 2017: Curēus
https://www.readbyqxmd.com/read/29117422/erratum-for-mathematical-model-to-compare-the-relative-tensile-strength-of-the-cornea-after-prk-lasik-and-small-incision-lenticule-extraction
#3
(no author information available yet)
No abstract text is available yet for this article.
November 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29090046/preparation-and-thickness-profile-of-endothelial-keratoplasty-lenticules-from-donated-whole-eyes-with-previous-photorefractive-keratectomy
#4
Mozhgan Rezaei Kanavi, Pejman Fahim, Mohsen Rahmanian, Tahereh Chamani, Bahar Kheiri, Sahar Balagholi, Mohammad Ali Javadi
PURPOSE: To describe the preparation and thickness profiles of endothelial keratoplasty lenticules harvested from eyes with previous photorefractive keratectomy (PRK). METHODS: Donor whole eyes that underwent PRK were subjected to microkeratome-assisted dissection for Descemet stripping automated endothelial keratoplasty. Specular microscopy and Visante optical coherence tomography were performed on precut corneas. Endothelial cell indices and thickness profiles of endothelial keratoplasty lenticules were statistically analyzed...
October 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29090045/comparison-between-pentacam-hr-and-orbscan-ii-after-hyperopic-photorefractive-keratectomy
#5
Mahmoud Jabbarvand, Farshad Askarizadeh, Mohamad Reza Sedaghat, Hadi Ghadimi, Bahram Khosravi, Mohammad Aghazadeh Amiri, Foroozan Narooie-Noori
PURPOSE: The aim of this study was to determine the agreement between Pentacam HR (Scheimpflug imaging, Oculus) and Orbscan II (scanning slit topography, Bausch and Lomb) in measuring corneal parameters after photorefractive keratectomy (PRK) for hyperopia. METHODS: In this prospective cross-sectional study, 38 hyperopic eyes undergoing PRK were examined before refractive surgery and 8 to 10 months postoperatively using Pentacam HR and Orbscan II. Ultrasound (US) pachymetry was also used to measure central corneal thickness (CCT)...
October 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29066773/biomechanical-simulation-of-stress-concentration-and-intraocular-pressure-in-corneas-subjected-to-myopic-refractive-surgical-procedures
#6
Po-Jen Shih, I-Jong Wang, Wen-Feng Cai, Jia-Yush Yen
Recent advances in the analysis of corneal biomechanical properties remain difficult to predict the structural stability before and after refractive surgery. In this regard, we applied the finite element method (FEM) to determine the roles of the Bowman's membrane, stroma, and Descemet's membrane in the hoop stresses of cornea, under tension (physiological) and bending (nonphysiological), for patients who undergo radial keratotomy (RK), photorefractive keratectomy (PRK), laser-assisted in situ keratomileusis (LASIK), or small incision lenticule extraction (SMILE)...
October 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29053556/epithelial-erosions-and-refractive-results-after-single-step-transepithelial-photorefractive-keratectomy-and-alcohol-assisted-photorefractive-keratectomy-in-myopic-eyes-a-comparative-evaluation-over-12-months
#7
Maamoun A Fattah, Rafic Antonios, Sam Arba Mosquera, Bachir Abiad, Shady T Awwad
PURPOSE: To evaluate the epithelial erosion incidence and refractive results in myopic eyes undergoing single-step transepithelial photorefractive keratectomy (TransPRK) compared with alcohol-assisted photorefractive keratectomy (PRK). METHODS: This was a retrospective nonrandomized comparative study conducted at the American University of Beirut Medical Center. A total of 189 eyes that had undergone single-step transepithelial PRK (TransPRK) were compared with 189 matched eyes that had undergone alcohol-assisted PRK over a follow-up of 1 year...
October 17, 2017: Cornea
https://www.readbyqxmd.com/read/29042748/corneal-biomechanical-properties-after-laser-assisted-in-situ-keratomileusis-and-photorefractive-keratectomy
#8
Eileen S Hwang, Brian C Stagg, Russell Swan, Carlton R Fenzl, Molly McFadden, Valliammai Muthappan, Luis Santiago-Caban, Mark D Mifflin, Majid Moshirfar
BACKGROUND: The purpose of this study was to evaluate the effects of laser-assisted in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) on corneal biomechanical properties. METHODS: We used the ocular response analyzer to measure corneal hysteresis (CH) and corneal resistance factor (CRF) before and after refractive surgery. RESULTS: In all, 230 eyes underwent LASIK and 115 eyes underwent PRK without mitomycin C (MMC). Both procedures decreased CH and CRF from baseline...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29042747/high-resolution-wavefront-guided-surface-ablation-with-corneal-cross-linking-in-ectatic-corneas-a-pilot-study
#9
Gustavo E Tamayo, Claudia Castell, Pilar Vargas, Eduardo Polania, Juliana Tamayo
PURPOSE: A preliminary study to evaluate the outcomes of high-resolution wavefront-guided (HRWG) photorefractive keratectomy (PRK) with simultaneous corneal cross-linking (CXL) in ectasia eyes. METHODS: Sixteen eyes of 11 patients (mean age 31.9±9.8 years; range: 15-48 years) with keratoconus or post-laser-assisted in situ keratomileusis ectasia underwent HRWG PRK with simultaneous CXL. Manifest refraction, uncorrected (UDVA) and corrected distance visual acuity (CDVA), and keratometric and aberrometric outcomes are reported at 12 months...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29022964/nocardia-arthritidis-keratitis-case-report-and-review-of-the-literature
#10
Andrew Gieger, Stephen Waller, Joseph Pasternak
INTRODUCTION: Keratitis due to Nocardia infection is not commonly encountered in clinical practice and may therefore be mistaken for fungal or viral keratitis leading to delayed treatment and increased risk of permanent visual impairment. CASE: An otherwise healthy 27 years old Caucasian Active Duty military member presented to the clinic with three days of light sensitivity and irritation of his right eye. He carried a history of PRK in both eyes six years prior and admitted to recent contact lens overuse...
January 2017: Nepalese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29018762/visual-performance-after-excimer-laser-photorefractive-keratectomy-for-high-myopia
#11
Yu-Ling Liu, Chien-Chi Tseng, Chang-Ping Lin
PURPOSE: To evaluate the efficacy, safety, predictability, and visual performance of excimer laser photorefractive keratectomy (PRK) for myopia greater than -8 diopters (D). METHODS: Fifty-four patients (104 eyes) with myopia from -8D to -13D and cylinder up to -4D received surface ablation technique with the Allegretto wave version 1009-1 excimer laser to correct their refractive error. The patients were examined on days 1, 3, 7, and 14 and 1, 3, 6, and 12 months postoperatively...
April 2017: Taiwan Journal of Ophthalmology
https://www.readbyqxmd.com/read/28991336/four-stage-procedure-for-keratoconus-icrs-implantation-corneal-cross-linking-toric-phakic-intraocular-lens-implantation-and-topography-guided-photorefractive-keratectomy
#12
Efekan Coskunseven, Daya Papalkar Sharma, Michael A Grentzelos, Onurcan Sahin, George D Kymionis, Ioannis Pallikaris
PURPOSE: To evaluate a four-stage combined treatment for keratoconus including intrastromal corneal ring segment (ICRS) implantation followed by corneal cross-linking (CXL), toric phakic intraocular lens (IOL) implantation, and topography-guided photorefractive keratectomy (TG-PRK). METHODS: In this retrospective interventional case series, 11 eyes of 7 patients with progressive keratoconus were treated with a four-stage procedure including the following: Keraring ICRS (Mediphacos Ltda, Belo Horizonte, Brazil) implantation followed by CXL, phakic IOL implantation, and TG-PRK (minimum 6 months between each stage)...
October 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28940405/actin-membrane-interactions-mediated-by-networked2-in-arabidopsis-pollen-tubes-through-associations-with-pollen-receptor-like-kinase-4-and-5
#13
Patrick Duckney, Michael J Deeks, Martin R Dixon, Johan Kroon, Timothy J Hawkins, Patrick J Hussey
During fertilization, Pollen Receptor-Like Kinases (PRKs) control pollen tube growth through the pistil in response to extracellular signals, and regulate the actin cytoskeleton at the tube apex to drive tip growth. We investigated a novel link between membrane-integral PRKs and the actin cytoskeleton, mediated through interactions between PRKs and NET2A; a pollen-specific member of the NETWORKED superfamily of actin-binding proteins. We characterize NET2A as a novel actin-associated protein that localizes to punctae at the plasma membrane of the pollen tube shank, which are stably associated with cortical longitudinal actin cables...
September 20, 2017: New Phytologist
https://www.readbyqxmd.com/read/28919909/photorefractive-keratectomy-in-the-management-of-postradial-keratotomy-hyperopia-and-astigmatism
#14
Mohammad Ghoreishi, Mohammad-Ali Abtahi, Iman Seyedzadeh, Hamid Fesharaki, Mohadeseh Mohammadnia, Hamidreza Jahanbani-Ardakani, Seyed-Hossein Abtahi
BACKGROUND: The aim of this study is to evaluate the results of photorefractive keratectomy (PRK) in the management of postoperative hyperopia and astigmatism in patients with history of radial keratotomy (RK). MATERIALS AND METHODS: This prospective nonrandomized noncomparative interventional case series enrolled consecutive eyes treated with PRK after RK. In cases, in which (1) wavefront (WF) scan was undetectable during primary examinations; and/or, (2) WF data were not transferable to the excimer laser device, patients were treated with the tissue-saving (TS) mode...
2017: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/28913504/a-review-and-meta-analysis-of-corneal-cross-linking-for-post-laser-vision-correction-ectasia
#15
REVIEW
Qi Wan, Dan Wang, HongQuan Ye, Jing Tang, Yu Han
PURPOSE: The aim of this study was to review the safety and stability of cornea cross-linking (CXL) for the treatment of keratectasia after Excimer Laser Refractive Surgery. METHODS: Eligible studies were identified by systematically searching PubMed, Embase, Web of Science and reference lists. Meta-analysis was performed using Stata 12.1 software. The primary outcome parameters included the changes of corrected distant visual acuity (CDVA), uncorrected visual acuity (UCVA), the maximum keratometry value (Kmax) and minimum keratometry value (Kmin), the surface regularity index (SRI), the surface asymmetry index (SAI), the keratoconus prediction index (KPI), corneal thickness, and endothelial cell count...
September 2017: Journal of Current Ophthalmology
https://www.readbyqxmd.com/read/28880340/topography-guided-photorefractive-keratectomy-in-the-treatment-of-corneal-scarring
#16
Nir Sorkin, Adi Einan-Lifshitz, Tanguy Boutin, Mahmood Showail, Armand Borovik, Clara C Chan, David S Rootman
PURPOSE: To report the outcome of topography-guided photorefractive keratectomy (TG-PRK) in the treatment of patients with corneal scarring. METHODS: A retrospective, interventional case series including 6 eyes of 6 patients with corneal scarring and irregular astigmatism who underwent TG-PRK. The etiologies for scarring were: infectious corneal ulcers, foreign body trauma, LASIK flap buttonhole, and lamellar keratoplasties performed to correct corneal perforation secondary to corneal melting...
September 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28820793/codeine-plus-acetaminophen-for-pain-after-photorefractive-keratectomy-a-randomized-double-blind-placebo-controlled-add-on-trial
#17
Vinicius B P Pereira, Renato Garcia, Andre A M Torricelli, Adriana Mukai, Samir J Bechara
BACKGROUND: Pain after photorefractive keratectomy (PRK) is significant, and the analgesic efficacy and safety of oral opioids in combination with acetaminophen has not been fully investigated in PRK trials. PURPOSE: To assess the efficacy and safety of the combination of codeine plus acetaminophen (paracetamol) versus placebo as an add-on therapy for pain control after PRK. STUDY DESIGN: Randomized, double-blind, placebo-controlled trial...
October 2017: Cornea
https://www.readbyqxmd.com/read/28815089/risk-assessment-for-corneal-ectasia-following-photorefractive-keratectomy
#18
Nir Sorkin, Igor Kaiserman, Yuval Domniz, Tzahi Sela, Gur Munzer, David Varssano
PURPOSE: To analyze the risk factors associated with a series of ectasia cases following photorefractive keratectomy (PRK) and all published cases. METHODS: In a retrospective study on post-PRK ectasia patients, 9 eyes of 7 patients were included, in addition to 20 eyes of 13 patients from the literature. Risk of post-PRK ectasia was calculated using the ectasia risk score system (ERSS) for laser in situ keratomileusis (LASIK) patients. The percent tissue altered (PTA) was also evaluated...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28795376/arabidopsis-prk6-interacts-specifically-with-atropgef8-12-and-induces-depolarized-growth-of-pollen-tubes-when-overexpressed
#19
Yuexuan Yu, Jiali Song, Xiaohui Tian, Haiwen Zhang, Legong Li, Huifen Zhu
The pollen receptor kinases (PRK) are critical regulators of pollen tube growth. The Arabidopsis genome encodes eight PRK genes, of which six are highly expressed in pollen tubes. The potential functions of AtPRK1 through AtPRK5, but not of AtPRK6, in pollen growth were analyzed in tobacco. Herein, AtPRK6 was cloned, and its function was identified. AtPRK6 was expressed specifically in pollen tubes. A yeast two-hybrid screen of AtPRK6 against 14 Arabidopsis Rop guanine nucleotide exchange factors (RopGEFs) showed that AtPRK6 interacted with AtRopGEF8 and AtRopGEF12...
August 8, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28791058/stereoacuity-after-wavefront-guided-photorefractive-keratectomy-in-anisometropia
#20
Farid Karimian, Vahid Ownagh, Mohammad Aghazadeh Amiri, Seyed Mehdi Tabatabaee, Nooshin Dadbin
PURPOSE: To determine changes in stereoacuity in anisometropic myopic eyes after photorefractive keratectomy (PRK). METHODS: Myopic patients with at least 1 diopter (D) of anisometropia in sphere, astigmatism, or spherical equivalent who were referred to our hospital for excimer refractive surgery were enrolled as a prospective sequential interventional case series. All patients underwent wavefront-guided photorefractive keratectomy (WFG-PRK) using the Technolas Perfect Vision (217z) Excimer laser machine...
July 2017: Journal of Ophthalmic & Vision Research
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