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https://www.readbyqxmd.com/read/29429144/results-of-ethanol-assisted-epithelium-on-corneal-cross-linking-with-and-without-intrastromal-corneal-ring-implantation
#1
Orhan Ayar, Orkun Muftuoglu, Mehmet Orcun Akdemir, Mehmet Cuneyt Ozmen
PURPOSE: To evaluate the topographic, refractive, and pachymetric changes after ethanol-assisted transepithelial corneal cross-linking (CXL) to stabilize progression of keratoconus (KC). PATIENTS AND METHODS: This study retrospectively evaluated the long-term topographic, refractive, and pachymetric changes in patients diagnosed with KC who underwent corneal cross-linking and/or intrastromal corneal ring segment (ICRS) implantation. The subjects were divided into three groups, corresponding to eyes treated with CXL alone (group 1), CXL and ICRS at the same time (group 2), and CXL after ICRS implantation (group 3)...
February 10, 2018: International Ophthalmology
https://www.readbyqxmd.com/read/29425391/incidence-and-outcomes-of-optical-zone-enlargement-and-recentration-after-previous-myopic-lasik-by-topography-guided-custom-ablation
#2
Dan Z Reinstein, Timothy J Archer, Glenn I Carp, Alastair J Stuart, Elizabeth L Rowe, Andrew Nesbit, Tara Moore
PURPOSE: To report the incidence, visual and refractive outcomes, optical zone enlargement, and recentration using topography-guided CRS-Master TOSCA II software with the MEL 80 excimer laser (Carl Zeiss Meditec AG, Jena, Germany) after primary myopic laser refractive surgery. METHODS: Retrospective analysis of 73 eyes (40 patients) with complaints of night vision disturbances due to either a decentration or small optical zone following a primary myopic laser refractive surgery procedure using the MEL 80 laser...
February 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29419553/malpractice-litigation-in-cornea-and-refractive-surgery-a-review-of-the-westlaw-database
#3
Stephanie B Engelhard, Christopher T Shah, Austin J Sim, Ashvini K Reddy
PURPOSE: To report and analyze the causes and outcomes of malpractice litigation in cornea and refractive surgery. METHODS: The WestLaw database was reviewed for all malpractice litigation related to ophthalmology in the United States between 1930 and 2014. Search terms included ophthalmology or ophthalmologist and malpractice anywhere in the retrieved results. All cases involving cornea and refractive surgery were included in this analysis, and results were compared with ophthalmology as a whole...
February 6, 2018: Cornea
https://www.readbyqxmd.com/read/29414861/customizable-optical-force-sensor-for-fast-prototyping-and-cost-effective-applications
#4
Jorge A Díez, José M Catalán, Andrea Blanco, José V García-Perez, Francisco J Badesa, Nicolás Gacía-Aracil
This paper presents the development of an optical force sensor architecture directed to prototyping and cost-effective applications, where the actual force requirements are still not well defined or the most suitable commercial technologies would highly increase the cost of the device. The working principle of this sensor consists of determining the displacement of a lens by measuring the distortion of a refracted light beam. This lens is attached to an elastic interface whose elastic constant is known, allowing the estimation of the force that disturbs the optical system...
February 7, 2018: Sensors
https://www.readbyqxmd.com/read/29413853/abstract-id-197-monte-carlo-simulations-of-x-ray-grating-interferometry-based-imaging-systems
#5
Stefan Tessarini, Michael K Fix, Werner Volken, Daniel Frei, Marco F M Stampanoni
Over the last couple of years the implementation of Monte Carlo (MC) methods of grating based imaging techniques is of increasing interest. Several different approaches were taken to include coherent effects into MC in order to simulate the radiation transport of the image forming procedure. These include full MC using FLUKA [1], which however are only considering monochromatic sources. Alternatively, ray-tracing based MC [2] allow fast simulations with the limitation to provide only qualitative results, i...
January 2018: Physica Medica: PM
https://www.readbyqxmd.com/read/29411563/review-of-technological-advancements-in-calibration-systems-for-laser-vision-correction
#6
Samuel Arba-Mosquera, Paolo Vinciguerra, Shwetabh Verma
Using PubMed and our internal database, we extensively reviewed the literature on the technological advancements in calibration systems, with a motive to present an account of the development history, and latest developments in calibration systems used in refractive surgery laser systems. As a second motive, we explored the clinical impact of the error introduced due to the roughness in ablation and its corresponding effect on system calibration. The inclusion criterion for this review was strict relevance to the clinical questions under research...
February 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29403584/visual-outcomes-and-refractive-status-after-combined-silicone-oil-removal-cataract-surgery-with-intraocular-lens-implantation
#7
Hussain F Al-Habboubi, Waseem Al-Zamil, Ali A Al-Habboubi, Rajiv Khandekar
Purpose: To evaluate refractive status and identify predictors of surgical success following a combined silicone oil removal/cataract surgery with intraocular lens (IOL) implantation procedure. Methods: In this single-armed, retrospective study, we reviewed patients who underwent vitreoretinal surgery followed by a combined silicone oil removal/cataract surgery procedure between 2009 and 2013. Preoperative data included patient demographics, refractive status, IOL power, and axial length (measured with the IOL Master)...
January 2018: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/29380406/foveal-vision-power-errors-induced-by-spectacle-lenses-designed-to-correct-peripheral-refractive-errors
#8
Sergio Barbero, Miguel Faria-Ribeiro
PURPOSE: Radial Refractive Gradient (RRG) spectacles are lenses specifically designed to minimize peripheral hyperopic defocus typically found in conventional spectacles. Our goals were: (1) to demonstrate a method to design such lenses; and (2) to quantify the exact foveal vision power errors induced by them. METHODS: The design procedure was based on a point-by-point sequential surface construction algorithm that designs a front aspheric surface (back surface is spherical) to achieve a given overall tangential focal length of the lens...
January 30, 2018: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/29376229/investigation-of-the-changes-in-refractive-surgery-trends-in-korea
#9
Jong Ho Ahn, Dong Hyun Kim, Kyung Hwan Shyn
PURPOSE: To evaluate changes in clinical practice in the field of refractive surgery in Korea over the past 10 years. METHODS: A survey consisting of 59 multiple-choice questions regarding the preferred types of refractive surgery, excimer laser machine, and presbyopia surgery was mailed to 742 members of the Korean Society of Cataract and Refractive Surgery in January 2016, and 50 members responded to the survey. These data were compared with the 2005 or 2007 survey results...
January 25, 2018: Korean Journal of Ophthalmology: KJO
https://www.readbyqxmd.com/read/29375990/5-year-follow-up-of-combined-non-topography-guided-photorefractive-keratectomy-and-corneal-collagen-cross-linking-for-keratoconus
#10
Abdulrahman Mohammed Al-Amri
AIM: To evaluate the visual outcomes of simultaneous non-topography guided photorefractive keratectomy (PRK) and corneal collagen cross-linking (CXL) in eyes with keratoconus 5y after the procedure. METHODS: Prospective, interventional, non-randomized, and non-controlled case series design was used. Sixty eyes of 30 patients (16 males and 14 females; age: 21-41y) with mild, non-progressive (stages 1-2) keratoconus were enrolled. Refraction, uncorrected distance visual acuity (UDVA) and corrected distance visual acuity (CDVA), flat and steep keratometry readings, and adverse events were evaluated preoperatively and postoperatively...
2018: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/29369200/effectiveness-and-confounding-factors-of-penetrating-astigmatic-keratotomy-in-clinical-practice-case-report
#11
Chu-Yu Yen, Gow-Lieng Tseng
RATIONALE: Penetrating astigmatic keratotomy (penetrating AK) is a well-known method to correct corneal astigmatism but rarely be performed nowadays. This article reevaluated the clinical effectiveness and confounding factors of penetrating AK. PATIENT CONCERNS: Penetrating AK has been introduced to serve as one alternative operation for astigmatism correction, and is thought to have the potential advantage of being more affordable and easy to perform. The purpose of our study is to evaluate the effectiveness and confounding factors of penetrating AK...
January 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29356102/self-assessment-of-refractive-errors-using-a-simple-optical-approach
#12
Alexander Leube, Caroline Kraft, Arne Ohlendorf, Siegfried Wahl
BACKGROUND: This explorative study investigated procedures for the self-assessment of spherocylindrical refractive errors. METHODS: Eighteen participants with a mean age of 34.0 ± 8.8 years were enrolled. Adjustable Alvarez lenses were mounted in a rotatable ring holder and two procedures were tested for the self-adjustment: (1) rotation of the lens in three meridians: 0°, 60° and 120° and (2) rotation of the optotypes in the same meridians. Starting from maximum positive power, the participants were required to decrease the power of the Alvarez lens until the optotypes (0...
January 21, 2018: Clinical & Experimental Optometry: Journal of the Australian Optometrical Association
https://www.readbyqxmd.com/read/29339637/corneal-collagen-crosslinking-combined-with-phototherapeutic-keratectomy-and-photorefractive-keratectomy-for-corneal-ectasia-after-laser-in-situ-keratomileusis
#13
Wei Zhu, Yunfei Han, Changxia Cui, Wenwen Xu, Xuan Wang, Xiaoxiao Dou, Linlin Xu, Yanyun Xu, Guoying Mu
PURPOSE: The aim of this study was to analyze the effects of corneal crosslinking (CXL) combined with phototherapeutic keratectomy (PTK) and photorefractive keratectomy (PRK) in halting the progression and improving the visual function of corneal ectasia after laser in situ keratomileusis (LASIK). METHODS: PTK-PRK-CXL was performed on 14 eyes of 14 patients who developed corneal ectasia after LASIK. The visual acuity, spherical refraction and cylinder, corneal topography indices, thinnest corneal thickness (TCT), and endothelial cell count were evaluated at baseline and at 1, 3, 6, and 12 months postoperatively...
January 17, 2018: Ophthalmic Research
https://www.readbyqxmd.com/read/29335099/femtosecond-laser-assisted-cataract-surgeries-reported-to-the-european-registry-of-quality-outcomes-for-cataract-and-refractive-surgery-baseline-characteristics-surgical-procedure-and-outcomes
#14
Mats Lundström, Mor Dickman, Ype Henry, Sonia Manning, Paul Rosen, Marie-José Tassignon, David Young, Ulf Stenevi
PURPOSE: To describe a large cohort of femtosecond laser-assisted cataract surgeries in terms of baseline characteristics and the related outcomes. SETTING: Eighteen cataract surgery clinics in 9 European countries and Australia. DESIGN: Prospective multicenter case series. METHODS: Data on consecutive eyes having femtosecond laser-assisted cataract surgery in the participating clinics were entered in the European Registry of Quality Outcomes for Cataract and Refractive Surgery (EUREQUO)...
December 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29335093/changes-in-biomechanically-corrected-intraocular-pressure-and-dynamic-corneal-response-parameters-before-and-after-transepithelial-photorefractive-keratectomy-and-femtosecond-laser-assisted-laser-in%C3%A2-situ-keratomileusis
#15
Hun Lee, Cynthia J Roberts, Tae-Im Kim, Renato Ambrósio, Ahmed Elsheikh, David Sung Yong Kang
PURPOSE: To evaluate the changes in biomechanically corrected intraocular pressure (IOP) and new dynamic corneal response parameters measured by a dynamic Scheimpflug analyzer before and after transepithelial photorefractive keratectomy (PRK) and femtosecond laser-assisted laser in situ keratomileusis (LASIK). SETTING: Yonsei University College of Medicine and Eyereum Eye Clinic, Seoul, South Korea. DESIGN: Retrospective case series. METHODS: Medical records of patients having transepithelial PRK or femtosecond-assisted LASIK were examined...
December 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29328157/talbot-lau-x-ray-deflectometry-phase-retrieval-methods-for-electron-density-diagnostics-in-high-energy-density-experiments
#16
Maria Pia Valdivia, Dan Stutman, Christian Stoeckl, Chad Mileham, Ildar A Begishev, Jake Bromage, Sean P Regan
Talbot-Lau x-ray interferometry uses incoherent x-ray sources to measure refraction index changes in matter. These measurements can provide accurate electron density mapping through phase retrieval. An adaptation of the interferometer has been developed in order to meet the specific requirements of high-energy density experiments. This adaptation is known as a moiré deflectometer, which allows for single-shot capabilities in the form of interferometric fringe patterns. The moiré x-ray deflectometry technique requires a set of object and reference images in order to provide electron density maps, which can be costly in the high-energy density environment...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29315441/ray-tracing-analysis-of-the-corneal-power-from-scheimpflug-data
#17
Thomas Olsen, Peter Jeppesen
PURPOSE: To describe a method by which mapped corneal elevation data can be used for ray-tracing analysis of the effective corneal power. METHODS: Mapped elevation data of the front and back surface of the cornea exported by a clinical Scheimpflug camera was triangulated into a polygonal format and imported into a commercial optical engineering software. The focal length of the cornea was determined by exact ray tracing analysis of the distance giving the sharpest point spread function (PSF) at the selected image plane...
January 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29315440/femtosecond-laser-assisted-stromal-lenticule-addition-keratoplasty-for-the-treatment-of-advanced-keratoconus-a-preliminary-study
#18
Leonardo Mastropasqua, Mario Nubile, Niccolò Salgari, Rodolfo Mastropasqua
PURPOSE: To investigate the in vivo effect of a novel femtosecond laser-assisted procedure termed stromal lenticule addition keratoplasty for advanced keratoconus. METHODS: Ten patients with stage III and IV stable keratoconus were included. Negative meniscus-shaped stromal lenticules were produced from corneoscleral eye bank buttons with a refractive lenticule extraction procedure with a 500-kHz VisuMax femtosecond laser (Carl Zeiss Meditec, Jena, Germany). Recipient corneas underwent a modified femtosecond laser flap-cut procedure to produce an intrastromal pocket and lenticules were implanted...
January 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29303763/development-of-mirror-pain-following-trigeminal-nerve-injury-a-case-report-and-review-of-neuropathic-mechanisms
#19
James A Giglio, John M Gregg
Following injury to a peripheral nerve, patients may complain of pain over the distribution of the same contralateral nerve, a phenomenon referred to as contralateral pain or mirror pain (MP). Symptoms of MP usually begin after the neuropathic pain from the original nerve injury has become chronic. Chronic neuropathic pain can lead to sensitization and spread of pain. Because the diagnosis of MP can be missed, patients may undergo multiple treatment procedures that prove to be ineffective in relieving the pain...
January 2018: General Dentistry
https://www.readbyqxmd.com/read/29300514/surgical-preferences-in-the-management-of-recalcitrant-endophthalmitis
#20
Roxana Fu, Joseph Childs, William Nunery, Peter Timoney
To assess the practice patterns of current members of the American Society of Ophthalmic Plastic and Reconstructive Surgery (ASOPRS) in the treatment of medically refractive endophthalmitis (MRE). A 17-question survey included the procedure of choice for MRE, the preferred type of orbital implant, the timing of implant placement, and the incidence of postoperative complications. 107 ASOPRS members participated in the study. In the setting of MRE, 72% preferred evisceration versus 28% who preferred enucleation...
January 4, 2018: Orbit
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