Search results for "Spectral domain"

showing 10 items of 12 documents

Curvature of iris profile in spectral domain optical coherence tomography and dependency to refraction, age and pupil size - the MIPH Eye&Health …

2016

Purpose Optical coherence tomography (OCT) of the anterior segment allows quantitative analysis of the geometry of the iris. We performed spectral domain OCT examinations in healthy emmetropic, hyperopic and myopic subjects to investigate iris curvature and its associations. Methods In a cross-sectional study, out of 4617 eyes (2309 subjects) those with refractive errors of +3 dioptres were identified by objective refraction. The iris was examined using the anterior segment mode of a spectral domain 3D OCT-2000 (Topcon Inc., Japan) in the temporal meridian, and OCT scans were investigated with respect to presence and amount of convex and concave iris configuration. Ninety-three eyes of 50 s…

AdultMaleAdolescentgenetic structuresGonioscopyIrisEmmetropiaSpectral domainRefraction OcularCurvatureYoung Adult03 medical and health sciences0302 clinical medicineOptical coherence tomographyAnterior Eye SegmentGermanyEye healthHumansMedicineIntraocular PressureAgedmedicine.diagnostic_testbusiness.industryIncidenceAge FactorsPupil sizePupilGeneral MedicineMiddle AgedRefractive ErrorsRefractioneye diseasesOphthalmologyCross-Sectional StudiesMeridian (perimetry visual field)030221 ophthalmology & optometryOptometryFemalesense organsbusinessTomography Optical Coherence030217 neurology & neurosurgeryActa Ophthalmologica
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Agreement between intraoperative anterior segment spectral-domain OCT and 2 swept-source OCT biometers.

2021

Purpose: To evaluate the agreement of different biometric parameters obtained using intraoperative spectral-domain optical coherence tomography (SD-OCT) and two swept-source optical coherence tomog...

MaleBiometryCorneal PachymetryPhysics::Medical PhysicsBiomedical EngineeringSpectral domain030204 cardiovascular system & hematology03 medical and health sciences0302 clinical medicineOpticsOptical coherence tomographyAnterior Eye SegmentLens CrystallinemedicineHumansAgedPhysicsAged 80 and overmedicine.diagnostic_testbusiness.industryReproducibility of ResultsGeneral MedicineCoherence (statistics)Middle AgedAxial Length EyeOptical biometerSurgeryFemalebusiness030217 neurology & neurosurgeryTomography Optical CoherenceExpert review of medical devices
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Intravitreal therapies for non-neovascular age-related macular degeneration with intraretinal or subretinal fluid

2017

OBJECTIVE: To evaluate the efficacy of intravitreal therapies in cases of atrophic age-related macular degeneration (AMD) with subretinal or intraretinal fluid. METHODS: A retrospective review was made of the clinical charts of patients diagnosed with atrophic AMD with subretinal or intraretinal fluid. Fundus photographs and spectral-domain optical coherence tomography images were examined, and an analysis was made on the presence of fluid and its density. Neovascularisation was ruled out by fluorescein and/or indocyanine green angiography. RESULTS: The study included 14 eyes from 13 patients with a mean age of 72.64 years and a mean follow-up of 80.5 weeks. Intraretinal fluid was observed …

MaleDegeneracion macular asociada a la edad no neovascularVisual acuityTriamcinolone acetonidegenetic structuresFluido subretinianoAngiogenesis InhibitorsFundus (eye)Triamcinolone0302 clinical medicineDegeneración macular asociada a la edad no neovascular Fluido intrarretiniano Fluido subretiniano Intraretinal fluid Intravitreal therapies Non-neovascular age related macular degeneration Spectral domain optical coherence tomography Subretinal fluid Terapias intravítreas Tomografía de coherencia óptica de dominio espectralFluorescein AngiographyTomografia de coherencia optica de dominio espectralAged 80 and overmedicine.diagnostic_testSubretinal FluidExudates and TransudatesGeneral MedicineFluorescein angiographyFluido intrarretinianoBevacizumabTreatment Outcomemedicine.anatomical_structureIntravitreal InjectionsFemalemedicine.symptomIntravitreal therapiesTomography Optical Coherencemedicine.drugSubretinal fluidmedicine.medical_specialtyBevacizumabRetinal DrusenRetinaSpectral domain optical coherence tomography03 medical and health sciencesNon-neovascular age related macular degenerationRanibizumabOphthalmologymedicineHumansAgedRetinabusiness.industryMacular degenerationmedicine.diseaseTerapias intravitreaseye diseasesSurgeryWet Macular Degeneration030221 ophthalmology & optometryIntraretinal fluidsense organsRanibizumabbusiness030217 neurology & neurosurgeryArchivos de la Sociedad Española de Oftalmología (English Edition)
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High myopic patients with and without foveoschisis: morphological and functional characteristics.

2020

Purpose: Myopic foveoschisis (MF) is characterized by the splitting of the retinal layers in the fovea of patients with high myopia (HM). MF may progress into foveal detachment or macular hole formation with consequent loss of central vision. The aim of this study is to investigate morphological and functional changes of the macular region in myopic subjects with and without foveoschisis. Design: Observational, cross-sectional, comparative study. Methods: Forty-eight patients with HM and 24 healthy controls were evaluated by spectral domain-optical coherence tomography (SD-OCT), multifocal electroretinography (mfERG) and microperimetry (MP-1) tests to assess macular thickness, functionality…

Myopic foveoschisisMalemedicine.medical_specialtyFovea Centralisgenetic structuresRetinoschisisVisual AcuityRetinoschisisFoveoschisisRetina03 medical and health scienceschemistry.chemical_compound0302 clinical medicinePhysiology (medical)OphthalmologyHigh myopiaVitrectomyPost-hoc analysismedicineChi-square testElectroretinographyHumansMacular holePathological myopiabusiness.industryMultifocal electroretinography (mfERG)RetinalMiddle Agedmedicine.diseaseRetinal Perforationseye diseasesSensory SystemsSpectral domain-optical coherence tomography (SD-OCT)high myopia; microperimetry (MP-1); multifocal electroretinography (mfERG); myopic foveoschisis; pathological myopia; retinoschisis; spectral domain-optical coherence tomography (SD-OCT)OphthalmologyCross-Sectional StudieschemistryMyopia Degenerative030221 ophthalmology & optometryMicroperimetry (MP-1)Visual Field TestsFemalesense organsAnalysis of varianceVisual FieldsbusinessMicroperimetry030217 neurology & neurosurgeryTomography Optical CoherenceDocumenta ophthalmologica. Advances in ophthalmology
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Pulsating B and Be Stars in the Magellanic Clouds

2010

Stellar pulsations in main-sequence B-type stars are driven by the κ-mechanism due to the Fe-group opacity bump. The current models do not predict the presence of instability strips in the B spectral domain at very low metallicities. As the metallicity of the Magellanic Clouds (MC) has been measured to be around Z = 0. 002 for the Small Magellanic Cloud (SMC) and Z = 0. 007 for the Large Magellanic Cloud (LMC), they constitute a very suitable objects to test these predictions. The aim of this work is to investigate the existence of B-type pulsators at low metallicities, searching for short-term periodic variability in a large sample of B and Be stars from the MC with accurately determined f…

PhysicsOpacityAstrophysics::High Energy Astrophysical PhenomenaMetallicitySpectral domainAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsInstabilityLarge sampleStars13. Climate actionAstrophysics::Solar and Stellar AstrophysicsSmall Magellanic CloudLarge Magellanic CloudAstrophysics::Galaxy Astrophysics
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Classifying DME vs Normal SD-OCT volumes: A review

2016

International audience; This article reviews the current state of automatic classification methodologies to identify Diabetic Macular Edema (DME) versus normal subjects based on Spectral Domain OCT (SD-OCT) data. Addressing this classification problem has valuable interest since early detection and treatment of DME play a major role to prevent eye adverse effects such as blindness. The main contribution of this article is to cover the lack of a public dataset and benchmark suited for classifying DME and normal SD-OCT volumes, providing our own implementation of the most relevant methodologies in the literature. Subsequently, 6 different methods were implemented and evaluated using this comm…

genetic structuresComputer scienceDiabetic macular edemaEarly detection[ SPI.SIGNAL ] Engineering Sciences [physics]/Signal and Image processingMachine learningcomputer.software_genre01 natural sciences010309 optics03 medical and health sciences0302 clinical medicinebenchmark0103 physical sciencesmedicine[SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processingRetinaBlindnessbusiness.industryMachine Learning (ML)medicine.diseaseeye diseasesSpectral Domain OCT (SD-OCT)medicine.anatomical_structure030221 ophthalmology & optometryBenchmark (computing)Artificial intelligenceData miningsense organsDiabetic Macular Edema (DME)businesscomputer[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
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Classification of SD-OCT Volumes with LBP: Application to DME Detection

2015

International audience; This paper addresses the problem of automatic classification of Spectral Domain OCT (SD-OCT) data for automatic identification of patients with Diabetic Macular Edema (DME) versus normal subjects. Our method is based on Local Binary Patterns (LBP) features to describe the texture of Optical Coherence Tomography (OCT) images and we compare different LBP features extraction approaches to compute a single signature for the whole OCT volume. Experimental results with two datasets of respectively 32 and 30 OCT volumes show that regardless of using low or high level representations, features derived from LBP texture have highly discriminative power. Moreover, the experimen…

genetic structuresLocal binary patternsComputer scienceDiabetic macular edemaSpectral domain02 engineering and technology[ SPI.SIGNAL ] Engineering Sciences [physics]/Signal and Image processing030218 nuclear medicine & medical imaging03 medical and health sciences0302 clinical medicineOptical coherence tomographyDiscriminative modelLBP0202 electrical engineering electronic engineering information engineeringmedicineDMEComputer vision[SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processingmedicine.diagnostic_testbusiness.industryeye diseasesDiabetic Macular EdemaOCT020201 artificial intelligence & image processingArtificial intelligencesense organsOptical Coherence Tomographybusiness[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
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Design and Validation of an Expanded Disability Status Scale Model in Multiple Sclerosis.

2020

<b><i>Introduction:</i></b> We aimed to develop and validate an Expanded Disability Status Scale (EDSS) model through clinical, optical coherence tomography (OCT), and magnetic resonance imaging (MRI) measures. <b><i>Methods:</i></b> Sixty-four multiple sclerosis (MS) patients underwent peripapillary retinal nerve fiber layer and segmented macular layers evaluation through OCT (Spectralis, Heidelberg Engineering). Brain parenchymal fraction was quantified through Freesurfer, while cervical spinal cord (SC) volume was assessed manually guided by Spinal Cord Toolbox software analysis. EDSS, neuroradiological, and OCT assessment were carried out …

medicine.medical_specialtyMultiple Sclerosisgenetic structuresPhysics::Medical PhysicsNerve fiber layerOrdinal regressionRetinaExpanded disability status scale Magnetic resonance imaging Multiple sclerosis Spectral domain optical coherence tomography Spinal cordDisability EvaluationOptical coherence tomographyOphthalmologyHumansMedicineCutoffExpanded Disability Status Scalemedicine.diagnostic_testbusiness.industryMultiple sclerosisBrainMagnetic resonance imagingmedicine.diseaseSpinal cordMagnetic Resonance Imagingeye diseasesmedicine.anatomical_structureNeurologyNeurology (clinical)sense organsbusinessTomography Optical Coherence
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Preliminary in vivo positional analysis of a posterior chamber phakic intraocular lens by optical coherence tomography and its correlation with clini…

2012

Purpose: To analyze by spectral-domain optical coherence tomography the anatomical relationship of a specific type of posterior chamber phakic intraocular lens (pIOL) implanted in cases of high to moderate myopia with the adjacent intraocular structures and to correlate it with clinical outcomes. Methods: Prospective observational case series including 18 eyes with high to moderate myopia (spherical equivalent between −5.88 and −15.75 D) of 9 patients (age range, 29–49 years) undergoing bilateral Phakic Refractive Lens (PRL, Zeiss) implantation. Postoperative visual acuity, refraction, contrast sensitivity (CS), and ocular higher order aberrations (HOA) were evaluated. Furthermore, the in v…

medicine.medical_specialtygenetic structuresSpectral domainPositional analysislcsh:OphthalmologyOptical coherence tomographyIn vivoOphthalmologymedicinelcsh:QC350-467Optical coherence tomographymedicine.diagnostic_testbusiness.industrySpectral-domaineye diseasesPosterior chamber phakic intraocular lensTomografía de coherencia ópticaLentes refractivas fáquicaslcsh:RE1-994Anatomical relationshipOriginal Articlesense organsDominio espectralPhakic Refractive Lens (PRL)businesslcsh:Optics. LightOptometryJournal of Optometry
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Macular laser photocoagulation guided by spectral-domain optical coherence tomography versus fluorescein angiography for diabetic macular edema.

2011

Roberto Gallego-Pinazo1,2, Ana Marina Suelves-Cogollos1, Rosa Dolz-Marco1, J Fernando Arevalo3, Salvador García-Delpech1, J Luis Mullor4, Manuel Díaz-Llopis1,2,51Department of Ophthalmology, Hospital Universitario La Fe, Valencia, Spain; 2Centro de Investigación Biomédica en Red de Enfermedades Raras, Valencia, Spain; 3Retina and Vitreous Service, Clinical Ophthalmology Center, Caracas, Venezuela; 4Unit of Experimental Ophthalmology, Hospital Universitario La Fe, Valencia, Spain; 5University of Valencia, Faculty of Medicine, Valencia, SpainBackground: The aim of this study was to compare the efficacy of spectral-domain optical coherence tomography…

medicine.medical_specialtygenetic structuresmedicine.diagnostic_testbusiness.industryDiabetic macular edemaClinical OphthalmologySpectral domainFluorescein angiographyLasereye diseaseslaw.inventionOphthalmologyOptical coherence tomographymacular laser photocoagulationlawspectral-domain optical coherence tomographyfluorescein angiographyOphthalmologymedicinesense organsdiabetic macular edemabusinessOriginal Research
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