keyword
MENU ▼
Read by QxMD icon Read
search

refraction

keyword
https://www.readbyqxmd.com/read/27932862/role-of-the-treating-surgeon-in-the-consent-process-for-elective-refractive-surgery
#1
Steven C Schallhorn, Stephen J Hannan, David Teenan, Julie M Schallhorn
PURPOSE: To compare patient's perception of consent quality, clinical and quality-of-life outcomes after laser vision correction (LVC) and refractive lens exchange (RLE) between patients who met their treating surgeon prior to the day of surgery (PDOS) or on the day of surgery (DOS). DESIGN: Retrospective, comparative case series. SETTING: Optical Express, Glasgow, UK. METHODS: Patients treated between October 2015 and June 2016 (3972 LVC and 979 RLE patients) who attended 1-day and 1-month postoperative aftercare and answered a questionnaire were included in this study...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27932859/central-corneal-thickness-of-iraqi-population-in-relation-to-age-gender-refractive-errors-and-corneal-curvature-a-hospital-based-cross-sectional-study
#2
Yasir Jawad Kadhim, Qasim K Farhood
BACKGROUND: Central corneal thickness (CCT) is an important indicator of corneal status. Its measurement provides valid information about corneal physiological condition and possible changes associated with diseases, traumas, and hypoxia. It is an integral part for interpretation of intraocular pressure and glaucoma patient management and in prerefractive procedure assessment. OBJECTIVE: The aim of this study is to determine the mean CCT among a normal Iraqi population and to correlate between CCT and age, gender, refraction, and corneal curvature...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27930797/unusual-severe-interface-inflammation-after-uneventful-small-incision-lenticule-extraction-smile
#3
Damien Guindolet, Abdellatif Badaoui, Maud Elluard, Sophie Stephan, Serge Doan, Isabelle Cochereau, Eric E Gabison
PURPOSE: To describe a 40-year-old woman who complained of visual loss in her left eye 3 days after an uneventful bilateral myopic refractive surgery by small incision lenticule extraction (SMILE). METHODS: Case report. RESULTS: A 4 × 5 mm anterior central stromal infiltration was observed with moderate pain associated with decreased corneal sensitivity and neither discharge nor fluorescein staining. Bacterial and fungal smears and cultures from the SMILE interface were negative and local antibiotic ineffective...
December 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27930796/surgical-correction-of-presbyopic-ametropia-with-non-refractive-transparent-corneal-inlay-and-an-implantable-collamer-lens
#4
Carlos Gutierrez Amoros
PURPOSE: To report the clinical outcomes of two patients implanted with the Raindrop Near Vision Inlay (ReVision Optics, Inc., Lake Forest, CA) to correct for presbyopia and the Visian implantable collamer lens (ICL) (STAAR Surgical, Monrovia, CA) to correct refractive error. METHODS: Case report. RESULTS: Two patients with presbyopic ametropia complained of blurred vision for distance and near. Both patients received a corneal inlay in the non-dominant eye followed by the Raindrop Inlay the following day...
December 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27930795/optical-measurement-of-straylight-in-eyes-with-cataract
#5
Onurcan Sahin, Alexandros Pennos, Harilaos Ginis, Lucia Hervella, Eloy A Villegas, Belen Cañizares, Jose Maria Marin, Ioannis Pallikaris, Pablo Artal
PURPOSE: To measure straylight in a cohort of patients with cataract using a novel optical instrument and to correlate optical straylight values with clinical grade of cataracts and psychophysical straylight values. METHODS: Measurements were performed on 53 eyes of 44 patients with cataract admitted to the ophthalmology service of the university hospital in Murcia, Spain, and 9 young volunteers with no known ophthalmic pathology. Lens opacities were classified according to the Lens Opacities Classification System Ill (LOCS III) under slit-lamp examination...
December 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27930794/using-donor-lenticules-obtained-through-smile-for-an-epikeratophakia-technique-combined-with-phototherapeutic-keratectomy
#6
Jing Zhao, Ling Sun, Yang Shen, Mi Tian, Peijun Yao, Xingtao Zhou
PURPOSE: To investigate the feasibility, safety, and efficacy of using a donor lenticule created during small incision lenticule extraction (SMILE) in an epikeratophakia technique combined with phototherapeutic keratectomy (PTK). METHODS: Six patients with decreased visual acuity due to a recurrence of corneal dystrophy were included in this prospective pilot study. PTK was performed using the MEL 80 excimer laser (Carl Zeiss Meditec, Jena, Germany) followed by the transplantation of donor lenticules onto the recipient eyes...
December 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27930793/intracorneal-ring-segments-implantation-for-corneal-ectasia
#7
Natalia T Giacomin, Glauco R Mello, Carla S Medeiros, Alyin Kiliç, Cristine C Serpe, Hirlana G Almeida, Newton Kara-Junior, Marcony R Santhiago
PURPOSE: To provide an overview of the predictability, safety, and efficacy of intrastromal corneal ring segment (ICRS) implantation as a tool to improve visual acuity and its association with other techniques such as corneal collagen cross-linking (CXL), addressing biomechanical outcomes, models, surgical planning and technique, indications, contraindications, and complications in ectatic corneas. METHODS: Literature review. RESULTS: ICRSs have been used to regularize the corneal shape and reduce corneal astigmatism and higher order aberrations, improve visual acuity to acceptable limits, and delay, or eventually prevent, a corneal keratoplasty in keratoconic eyes...
December 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27930792/corneal-thickness-after-smile-affects-scheimpflug-based-dynamic-tonometry
#8
Joaquín Fernández, Manuel Rodríguez-Vallejo, Javier Martínez, Ana Tauste, David P Piñero
PURPOSE: To evaluate the corneal biomechanical changes due to small incision lenticule extraction (SMILE) measured by Scheimpflug-based dynamic tonometry and to assess the impact of the corneal thickness. METHODS: Sixty-eight patients measured with the Corvis ST (Oculus Optikgeräte GmbH, Wetzlar, Germany) preoperatively and 1 month after SMILE were included in this retrospective observational study. Patients were divided into three groups depending on the preoperative spherical equivalent: low from -1...
December 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27930791/computational-biomechanical-analysis-of-asymmetric-ectasia-risk-in-unilateral-post-lasik-ectasia
#9
Ali Vahdati, Ibrahim Seven, Naveen Mysore, J Bradley Randleman, William J Dupps
PURPOSE: To develop a computational approach to corneal biomechanical risk analysis in refractive surgery and to investigate its utility in an enigmatic case of unilateral ectasia after bilateral LASIK. METHODS: Preoperative corneal elevation datasets from both eyes of a patient who developed unilateral post-LASIK ectasia were used to construct geometrically patient-specific, microstructurally motivated finite element models. Models were assessed before and after implementation of case-specific treatment parameters for interocular differences in corneal geometry and strain behavior under physiological loading conditions...
December 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27930790/detection-of-keratoconus-with-a-new-biomechanical-index
#10
Riccardo Vinciguerra, Renato Ambrósio, Ahmed Elsheikh, Cynthia J Roberts, Bernardo Lopes, Emanuela Morenghi, Claudio Azzolini, Paolo Vinciguerra
PURPOSE: To evaluate the ability of a new combined biomechanical index called the Corvis Biomechanical Index (CBI) based on corneal thickness profile and deformation parameters to separate normal from keratoconic patients. METHODS: Six hundred fifty-eight patients (329 eyes in each database) were included in this multicenter retrospective study. Patients from two clinics located on different continents were selected to test the capability of the CBI to separate healthy and keratoconic eyes in more than one ethnic group using the Corvis ST (Oculus Optikgeräte GmbH, Wetzlar, Germany)...
December 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27930789/comparison-of-corneal-riboflavin-gradients-using-dextran-and-hpmc-solutions
#11
Tobias Ehmke, Theo G Seiler, Isaak Fischinger, Tammo Ripken, Alexander Heisterkamp, Beatrice E Frueh
PURPOSE: To determine the riboflavin concentration gradient in the anterior corneal stroma when using hydroxypropyl methylcellulose (HPMC) or dextran as the carrier agent. METHODS: Four different groups of porcine corneas (5 each) were compared regarding the riboflavin concentration in the anterior stroma. Prior to all experiments, stable hydration conditions were established for the corresponding solution. The dextran groups were treated with 0.1% riboflavin in 20% dextran for 10 and 30 minutes and the HPMC groups with 0...
December 1, 2016: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/27930395/excimer-laser-versus-phakic-intraocular-lenses-for-myopia-and-astigmatism-a-meta-analysis-of-randomized-controlled-trials
#12
Haiting Chen, Yu Liu, Guangzeng Niu, Ma Jingxue
OBJECTIVE: Meta-analysis of randomized controlled trials (RCTs) which compared excimer laser refractive surgery and phakic intraocular lenses (PIOLs) for the treatment of myopia and astigmatism. METHODS: An electronic literature search was performed using the PubMed, EBSCO, CNKI, and Cochrane Library database to identify prospective RCTs which compared excimer laser refractive surgery and PIOL with a follow-up time of at least 12 months. Efficacy, accuracy, safety outcomes, and complications were analyzed by standardized mean difference, risk ratio, and the pooled estimates according to a fixed effect model or random effect model...
October 25, 2016: Eye & Contact Lens
https://www.readbyqxmd.com/read/27929723/prevalence-and-risk-factors-of-strabismus-in-a-uk-multi-ethnic-birth-cohort
#13
Alison Bruce, Gillian Santorelli
PURPOSE: To determine the prevalence, types and early-life risk factors associated with strabismus in a multi-ethnic birth cohort of children aged 4-5 years in the first year of school. METHODS: Data were collected prospectively over a 3-year period (2012-2015) from children participating in the vision screening program provided by orthoptists and carried out in schools located in the city of Bradford, UK. Prevalence of strabismus was determined for 17,018 children aged 4 to 5 years...
December 2016: Strabismus
https://www.readbyqxmd.com/read/27928375/a-randomised-controlled-trial-of-treatment-for-post-stroke-homonymous-hemianopia-screening-and-recruitment
#14
Fiona J Rowe, Elizabeth J Conroy, P Graham Barton, Emma Bedson, Emma Cwiklinski, Caroline Dodridge, Avril Drummond, Marta Garcia-Finana, Claire Howard, Stevie Johnson, Claire MacIntosh, Carmel P Noonan, Alex Pollock, Janet Rockliffe, Catherine M Sackley, Tracey Shipman
The authors report the screening process and recruitment figures for the VISION (Visual Impairment in Stroke; Intervention Or Not) trial. This is a prospective, randomised, single-blinded, three-arm controlled trial in 14 UK acute hospital stroke units. Stroke teams identified stroke survivors suspected as having homonymous hemianopia. Interventions included Fresnel prisms versus visual search training versus standard care (information only). Primary outcome was change in visual field assessment from baseline to 26 weeks...
February 2016: Neuro-ophthalmology
https://www.readbyqxmd.com/read/27926756/cutting-and-decellularization-of-multiple-corneal-stromal-lamellae-for-the-bioengineering-of-endothelial-grafts
#15
Zhiguo He, Fabien Forest, Aurélien Bernard, Anne-Sophie Gauthier, Romain Montard, Michel Peoc'h, Clotilde Jumelle, Emilie Courrier, Chantal Perrache, Philippe Gain, Gilles Thuret
Purpose: Engineered corneal endothelial grafts able to provide numerous functional endothelial cells for the restoration of corneal transparency would be a worthwhile way of replacing donor tissue, which is extremely scarce. The grafts are simply constructed: a biocompatible thin and transparent carrier colonized by a monolayer of cultured endothelial cells (ECs). Here we describe a process able to obtain appropriate carriers by recycling human corneas unsuitable for graft in their original state, but liable to provide multiple thin lamellae when cut with a femtosecond laser as used in refractive surgery...
December 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27924486/surface-plasmon-resonance-a-useful-strategy-for-the-identification-of-small-molecule-argonaute-2-protein-binders
#16
Elena Poser, Ilaria Genovese, Silvia Masciarelli, Teresa Bellissimo, Francesco Fazi, Gianni Colotti
Surface plasmon resonance (SPR) is one of the most important techniques for the detection and the characterization of molecular interactions. SPR technology is a label-free approach for monitoring biomolecular interactions in real time. The binding of analytes to molecules immobilized on a thin metal film (ligand) determines a change in the refractive index and, therefore in the angle of extinction of light, is reflected when polarized light hits the film, monitored in real time as a change in the position of the dip in reflected intensity...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27923771/off-axis-astigmatism-in-the-isolated-chicken-crystalline-lens
#17
Felix Maier, Siegfried Wahl, Frank Schaeffel
The chicken eye was previously found to have little off-axis astigmatism which is not explained by its special corneal shape but rather by the optical properties of the crystalline lens. To learn more about lens design, we studied off-axis astigmatism in the chicken lens in situ and compared it to a glass lens of similar power but with homogenous refractive index. After euthanasia, enucleated eye balls were cut in the equatorial plane right behind the scleral ossicles. The anterior segment was placed in a water-filled chamber...
December 2016: Vision Research
https://www.readbyqxmd.com/read/27922082/optimized-invisibility-cloaks-from-the-logarithm-conformal-mapping
#18
Chunhui Zhu, Lijun Liu, Zhengyong Song, Qing Huo Liu
Invisibility cloaks designed from the coordinate transformation method have attracted increasing interest recently. Conformal transformation optics scheme leads to cloaks that possess isotopic media, thus provides a prospective way to facilitate easier realization. Reducing the maximum value of the refractive index required by the cloaks is very important in practical imple- mentation. This letter studies on how the parameters in the logarithm conformal mapping control the cloaking effect. The optimized invisibility cloaks are designed...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921328/comprehensive-profile-of-bilateral-astigmatism-rule-similarity-and-symmetry-patterns-of-the-axes-in-the-fellow-eyes
#19
Amir Asharlous, Mehdi Khabazkhoob, Abbasali Yekta, Hassan Hashemi
PURPOSE: To study rule similarity (isorule or anisorule) and symmetry patterns of axes (direct and mirror) in bilateral astigmatism. METHODS: Six years of data were collected from four ophthalmology clinics in Tehran. After applying the exclusion criteria (having eye disease or history of ocular surgery), final analyses were performed on data of 160 608 cases whose mean age was 39.2 ± 15.4 years (10-80 years) and 53.7% female. All subjects had autorefraction, retinoscopy, and subjective refraction data...
December 5, 2016: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
https://www.readbyqxmd.com/read/27921322/the-heterophoria-of-3-5-year-old-children-as-a-function-of-viewing-distance-and-target-type
#20
Mary E Troyer, Vidhyapriya Sreenivasan, T J Peper, T Rowan Candy
PURPOSE: Heterophoria is the misalignment of the eyes in monocular viewing and represents the accuracy of vergence driven by all classical cues except disparity. It is challenging to assess restless children using clinical cover tests, and phoria in early childhood is poorly understood. Here we used eye tracking to assess phoria as a function of viewing distance and target in adults and young children, with comparison to clinical cover tests. METHODS: Purkinje image tracking (MCS PowerRefractor) was used to record eye alignment in adults (19-28 years, N = 24) and typically developing children (3-5 years, N = 24)...
December 5, 2016: Ophthalmic & Physiological Optics: the Journal of the British College of Ophthalmic Opticians (Optometrists)
keyword
keyword
37219
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"