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corneal refraction

Lucía Hervella, Eloy A Villegas, Pedro M Prieto, Pablo Artal
PURPOSE: To clinically validate an adaptive optics visual simulator (VAO) that measures subjective refraction and visual acuity. SETTING: Optics Laboratory, University of Murcia, Murcia, Spain. DESIGN: Prospective case series. METHODS: Using the adaptive optics visual simulator, 2 examiners measured the subjective refraction and visual acuity in healthy eyes of volunteers; 1 examiner also used a trial frame as a gold standard...
October 8, 2018: Journal of Cataract and Refractive Surgery
Efstathios Vounotrypidis, Velina Haralanova, Daniel R Muth, Christian Wertheimer, Mehdi Shajari, Armin Wolf, Siegfried Priglinger, Wolfgang J Mayer
PURPOSE: To evaluate the accuracy of a swept-source optical coherence tomography (SS-OCT) biometer compared with a standard partial coherence interferometry (PCI) biometer in terms of phacovitrectomy for vitreomacular pathology and cataract. SETTING: Department of Ophthalmology, Ludwig-Maximilians-University Munich, Germany. DESIGN: Prospective, nonrandomized, single center consecutive case series. METHODS: Patients with age-related cataract, regular corneal astigmatism less than 1...
October 8, 2018: Journal of Cataract and Refractive Surgery
Rupal L Shah, Jeremy A Guggenheim
Previous studies have suggested that naturally occurring genetic variation contributes to the risk of astigmatism. The purpose of this investigation was to identify genetic markers associated with corneal and refractive astigmatism in a large-scale European ancestry cohort (UK Biobank) who underwent keratometry and autorefraction at an assessment centre. Genome-wide association studies for corneal and refractive astigmatism were performed in individuals of European ancestry (N = 86,335 and 88,005 respectively), with the mean corneal astigmatism or refractive astigmatism in fellow eyes analysed as a quantitative trait (dependent variable)...
October 10, 2018: Human Genetics
Heba A El Gendy, Noha M Khalil, Iman M Eissa, Shireen Ma Shousha
Purpose: Studying the early effect of different extraocular muscle (EOM) surgeries on corneal biomechanics. Subjects and methods: This is a prospective, nonrandomized, interventional study, in which 42 eyes of 29 candidates for EOM surgery for strabismus correction at Cairo university hospitals, aged 14-37 years, were recruited. All participants had measuring of the visual acuity, refraction (spherical equivalent (SE)), assessment of the EOM motility and muscle balance, sensory evaluation, fundus examination, and assessing the ocular biomechanics using the Ocular response analyzer (ORA, Reichert, INC...
2018: Journal of Ophthalmology
Katarzyna Krysik, Dariusz Dobrowolski, Ewa Wroblewska-Czajka, Anita Lyssek-Boron, Edward Wylegala
Aim: To conduct a retrospective analysis of secondary IOL implantation in patients who underwent PK with no simultaneous IOL implantation. Materials and Methods: The retrospective study of the secondary implantation of IOLs was conducted in 46 eyes that underwent a primary operation with PK and cataract/lens extraction with no IOL implantation due to capsule rupture or combining corneal or intraocular complications. The minimum period from PK was 12 months. All secondary IOL implantations were performed from January 2011 to August 2017...
2018: Journal of Ophthalmology
Pradhnya Sen, Chintan Shah, Alok Sen, Elesh Jain, Amit Mohan
PURPOSE: To compare the visual and refractive outcomes and complications of primary and secondary intraocular lens (IOL) implantation after open-globe injury in pediatric patients. SETTING: Sadguru Netra Chikitsalaya, Madhya Pradesh, India. DESIGN: Retrospective case series. METHODS: Patients had primary cataract extraction with IOL implantation with globe repair (Group A) or repair followed by secondary IOL implantation (Group B)...
October 5, 2018: Journal of Cataract and Refractive Surgery
Ahmed Shalaby Bardan, Hanbin Lee, Mayank A Nanavaty
PURPOSE: To evaluate the outcomes of simultaneous and sequential corneal crosslinking (CXL) and excimer laser surface ablation protocols in keratoconus. METHODS: A literature review was conducted using MEDLINE. The studies were divided into three groups: the sequential group included studies with CXL followed by excimer laser surface ablation later, the simultaneous group included simultaneous excimer laser surface ablation and CXL, and the no CXL group included excimer laser surface ablation only with no CXL...
October 1, 2018: Journal of Refractive Surgery
Paolo Vinciguerra, Riccardo Vinciguerra, J Bradley Randleman, Ingrid Torres, Emanuela Morenghi, Fabrizio I Camesasca
PURPOSE: To report long-term outcomes of sequential customized therapeutic keratectomy for Reis-Bücklers' corneal dystrophy. METHODS: This was a retrospective review of 14 eyes of 8 patients with Reis-Bücklers' corneal dystrophy that underwent surgical peeling with a spatula of the epithelium and subepithelial membrane present in Reis-Bücklers' corneal dystrophy, with subsequent sequential customized therapeutic keratectomy featuring a multi-step approach with sequential, repeated customized excimer laser photoablations alternating with repeat intraoperative topographies to monitor and progressively reduce corneal irregularities...
October 1, 2018: Journal of Refractive Surgery
Oren Golan, Eric S Hwang, Paul Lang, Marcony R Santhiago, Adi Abulafia, David Touboul, Mark Krauthammer, David Smadja
PURPOSE: To compare posterior corneal features and their discriminating power for differentiating normal corneas from subclinical keratoconus using the Placido dual-Scheimpflug analyzer. METHODS: Patients were retrospectively included in the study. The preoperative normal right eyes of 79 patients imaged with a Placido dual-Scheimpflug system and with a stable postoperative LASIK follow-up of a minimum of 36 months were included in the normal group and were compared to 39 contralateral topographically normal eyes with clinically evident keratoconus in the fellow eye...
October 1, 2018: Journal of Refractive Surgery
José F Alfonso, Carlos Lisa, Belen Alfonso-Bartolozzi, Luis Fernández-Vega-Cueto, Robert Montés-Micó
PURPOSE: To assess the visual outcomes, predictability, and safety of the Implantable Collamer Lens (ICL) (STAAR Surgical, Inc., Monrovia, CA) for the management of residual pseudophakic refractive error. METHODS: Forty-nine pseudophakic eyes of 40 patients in which myopic, hyperopic, or toric ICLs were implanted were retrospectively analyzed. Twenty-nine eyes had been implanted with a monofocal intraocular lens (IOL) and 20 eyes had a multifocal IOL. All IOLs were implanted in the capsular bag...
October 1, 2018: Journal of Refractive Surgery
Natalia S Anisimova, Lisa B Arbisser, Goran Petrovski, Svetlana V Petrichuk, Nikolay P Sobolev, Beata Petrovski, Sergey A Borsenok, Yurii A Komah, Boris E Malyugin
PURPOSE: To compare the concentrations of interleukin (IL) (IL-1b, IL-2, IL-4, IL-5, IL-6, IL-8, IL-10, IL-12p70), interferon (IFN)-γ, tumor necrosis factor (TNF)-α, and TNF-β in the aqueous humor of patients undergoing femtosecond laser-assisted cataract surgery (FLACS) and corneal mechanical paracentesis treated with two different topical nonsteroidal anti-inflammatory drugs (NSAIDs): bromfenac and indomethacin. METHODS: In this prospective, randomized controlled, single-center study, aqueous humor samples were obtained immediately after performing the femtosecond laser procedure or at the start of conventional phacoemulsification...
October 1, 2018: Journal of Refractive Surgery
Mohammad M Shehadeh, Mohammad T Akkawi, Ammar A Aghbar, Muna T Musmar, Malak N Khabbas, Marah F Kharouf, Liana Al-Labadi
Background: Laser corneal refractive surgery suits, technology and nomograms are improving with time. This may improve the refractive and visual outcomes of the patients. Objectives: To evaluate the safety, efficacy, stability, and predictability of wavefront-optimized photorefractive keratectomy and Laser-assisted in-situ keratomileusis in patients with myopia and myopic astigmatism over 1-year using WaveLight® EX500 Excimer Laser machine. Methods: In this prospective cohort study, refractive and visual outcomes in 596 eyes (365 patients), either having myopia or myopic astigmatism were assessed...
2018: Open Ophthalmology Journal
Mathias Hvidtfelt Hansen, Inger Christine Munch, Xiao Qiang Li, Anne Mette Skovgaard, Else Marie Olsen, Michael Larsen, Line Kessel
PURPOSE: To evaluate the prevalence of amblyopia and associated biometric factors in Danish children. METHODS: Determination of best-corrected visual acuity (BCVA) using ETDRS charts, non-cycloplegic subjective refractioning guided by automated refractometry, axial length and corneal curvature, fundus photography and optical coherence tomography (OCT) in 1335 children from the population-based Copenhagen Child Cohort 2000 (CCC2000) Eye Study. Birth data were obtained from the Danish Medical Birth Registry...
October 2, 2018: Acta Ophthalmologica
Otavio A Magalhaes, Helena C Rohenkohl, Liliane Todeschini de Souza, Lavinia Schuler-Faccini, Têmis M Félix
PURPOSE: The goal of this study was to evaluate corneal profiles of patients with osteogenesis imperfecta (OI) due to a collagen I gene mutation. METHODS: This was a cross-sectional comparative study. There were 84 eyes from 42 patients with OI types I, III, and IV who were recruited from the OI Clinic at the Clinical Hospital of Porto Alegre, Brazil. All cases presented either COL1A1 or A2 gene mutations. Controls were matched by sex, age, and refractive error...
September 27, 2018: Cornea
Mengyu Wang, Yaohua Zhang, Wenjing Wu, Joshua A Young, Kathryn M Hatch, Roberto Pineda, Tobias Elze, Yan Wang
Purpose: To investigate whether preoperative corneal topographic and biomechanical parameters (CTBPs) predict postoperative residual refractive error (RRE). Methods: We retrospectively included 151 eyes from 151 patients of small-incision lenticule extraction (SMILE) with target RRE of plano and 3-month measurements of refractive error from Tianjin Eye Hospital. Multivariate linear/logistic regressions were performed to associate age, gender, preoperative refractive error, lenticule thickness, and CTBPs with postoperative RRE/the occurrence of myopic RRE ≤ -0...
September 2018: Translational Vision Science & Technology
Abdulrahman Mohammed Al-Amri
Objective: This study examined the prevalence of keratoconus among patients who were interested in undergoing refractive surgery. Corneal tomography measurements were used to help detect keratoconus. Methods: Adult subjects who presented to the private hospital Cataract and Refractive Surgery Unit (Abha, Saudi Arabia) for refractive surgery evaluation were considered for inclusion in this cross-sectional, retrospective study. All subjects were from the Aseer province, a southern, high-altitude region in Saudi Arabia, and presented between January and December 2017...
2018: Journal of Ophthalmology
Paulo Rodolfo Tagliari Barbisan, Marina Gonçalves Monteiro Viturino, Fernanda Maria Silveira Souto, Bo Tian, Roberto Damian Pacheco Pinto, Lucas Barasnevicius Quagliato, Maurício Abujamra Nascimento, Rosane Silvestre de Castro, Carlos Eduardo Leite Arieta
Purpose: To assess potential vascular, structural, and functional changes to the macula in patients with keratoconus that underwent ultraviolet A (UVA)-riboflavin-mediated corneal collagen cross-linking (CXL) therapy. Patients and methods: Seventeen eyes from 17 patients of age 16 years or older with keratoconus undergoing CXL treatment were studied. The same eye served as its own control (before CXL vs after CXL). Eyes were evaluated in terms of best-corrected visual acuity (BCVA), refractive error, intraocular pressure, Amsler grid, retinography, fluorescein angiography, autofluorescence, and spectral domain optical coherence tomography (SD-OCT) prior to CXL and 7 and 30 days after treatment...
2018: Clinical Ophthalmology
Yun-Hsiu Hsieh, Tzu-Heng Weng, Yu-Ching Chou, Kuan-Liang Wu, Chang-Min Liang, Ming-Cheng Tai
BACKGROUND: Post-LASIK corneal conditions cannot be accurately measured by traditional optometric approaches. Therefore, we aimed to analyze the agreement of two rotating Scheimpflug cameras in corneal assessment. METHODS: Fifty otherwise healthy volunteers who had undergone LASIK were recruited in this study. The values of mean and central total corneal power (TCP), including TCP1, TCP2, and TCP-IOL, were measured by GALILEI Scheimpflug camera. The values of total corneal refractive power (TCRP) readings at both 2 mm ring and 3 and 4 mm zones were detected by Pentacam Scheimpflug camera...
September 26, 2018: Journal of the Chinese Medical Association: JCMA
Adegboyega Sunday Alabi, Olufisayo Temitayo Aribaba, Adewumi Olabimpe Alabi, Olubanke Ilo, Adeola O Onakoya, Folasade B Akinsola
Aim: The purpose of this study was to determine the prevalence of visual impairment and ocular morbidities among primary and secondary schoolchildren aged 5 years to <l6 years in Ifo, Ifo Local Government Area in Ogun State, Nigeria. Materials and Methods: The study was a population-based descriptive cross-sectional study conducted among schoolchildren aged 5 years to <16 years old attending primary and secondary schools in Ifo, Ifo Local Government Area of Ogun State...
July 2018: Nigerian Postgraduate Medical Journal
Wook Kyum Kim, Bong Jun Kim, Ik-Hee Ryu, Jin Kook Kim, Sun Woong Kim
PURPOSE: To investigate topographic changes in corneal epithelial thickness (CET) and stromal thickness following orthokeratology (OK) and to determine associated factors affecting refractive changes. METHODS: This study investigated the topographic changes in CET and stromal thickness in 60 myopic eyes that were fitted with OK lenses. CET and stromal thickness were obtained using spectral-domain optical coherence tomography (OCT) before and after OK lens wear. Changes in refractive error and corneal topography data were obtained...
2018: PloS One
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