0000000000242378

AUTHOR

Manuel Rodríguez-vallejo

showing 8 related works from this author

The effect of fractal contact lenses on peripheral refraction in myopic model eyes.

2014

Purpose: To test multizone contact lenses in model eyes: Fractal Contact Lenses (FCLs), designed to induce myopic peripheral refractive error (PRE). Methods: Zemax ray-tracing software was employed to simulate myopic and accommodation-dependent model eyes fitted with FCLs. PRE, defined in terms of mean sphere M and 90–180 astigmatism J180, was computed at different peripheral positions, ranging from 0 to 35 in steps of 5, and for different pupil diameters (PDs). Simulated visual performance and changes in the PRE were also analyzed for contact lens decentration and model eye accommodation. For comparison purposes, the same simulations were performed with another commercially available conta…

Refractive errorMaterials scienceAstigmatismProsthesis DesignRefraction OcularModels BiologicalPupilMyopia progressionCellular and Molecular NeuroscienceFractalOpticsmedicineMyopiaHumansContact lensesZemaxbusiness.industryModel eyesPeripheral refractionAccommodation Ocularmedicine.diseaseContact Lenses HydrophilicRefractionSensory SystemsContact lensOphthalmologyFractalsFISICA APLICADAVisual FieldsbusinessAccommodationCurrent eye research
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Stereopsis assessment at multiple distances with an iPad application

2017

[EN] We present a new application for iPad for screening stereopsis at multiple distances that allows testing up to ten levels of stereoacuity at each distance. Our approach is based on a random dot stereogram viewable with anaglyph spectacles. Sixty-five subjects with no ocular diseases, wearing their habitual correction were measured at 3 m and 0.5 m. Results were compared with a standard stereoscopic test (TNO). We found not statistically significant differences between both tests, but our method achieved higher reproducibility. Applications in visual screening programs and to design and use of 3D displays, are suggested. (C) 2017 Elsevier B.V. All rights reserved.

Computer science3D displaysStereoacuityIPad02 engineering and technologyStereo displayHuman-Computer InteractionStereoscopic acuity03 medical and health sciences0302 clinical medicineStereopsisDepth perceptionHardware and ArchitectureComputer graphics (images)FISICA APLICADA030221 ophthalmology & optometry0202 electrical engineering electronic engineering information engineering020201 artificial intelligence & image processingElectrical and Electronic EngineeringScreening stereopsisBinocular visionDepth perceptionBinocular vision
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<p>Multimodal Evaluation of Visual Function in Geographic Atrophy versus Normal Eyes</p>

2020

Purpose To comprehensively evaluate visual function in eyes with geographic atrophy (GA) as compared to normal eyes. Patients and Methods Sixty-three eyes from 63 patients ≥50 years old were recruited for this observational study; 31 were identified as normal macular health eyes and 32 with GA. Visual function was tested with best corrected visual acuity (BCVA), low luminance visual acuity (LLVA), low luminance deficit (LLD), reading speed, macular integrity microperimetry, fixation stability, and contrast sensitivity function (CSF). Anatomic function was evaluated with spectral-domain optical coherence tomography (SD-OCT) and fundus autofluorescence (FAF). Quality of life and vision were a…

medicine.medical_specialtyVisual acuitygenetic structuresmedicine.diagnostic_testbusiness.industryVisual impairmenteye diseasesGeographic atrophy03 medical and health sciencesOphthalmology0302 clinical medicineOptical coherence tomographyVisual functionOphthalmologyFixation (visual)030221 ophthalmology & optometrymedicineSpatial frequencymedicine.symptombusinessMicroperimetry030217 neurology & neurosurgeryClinical Ophthalmology
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Relative Peripheral Myopia Induced by Fractal Contact Lenses

2018

[EN] Purpose: To assess the peripheral refraction induced by Fractal Contact Lenses (FCLs) in myopic eyes by means of a two-dimensional Relative Peripheral Refractive Error (RPRE) map. Materials and Methods: This study involved 26 myopic subjects ranging from -0.50 D to -7.00 D. FCLs prototypes were custom-manufactured and characterized. Corneal topographies were taken in order to assess correlations between corneal asphericity and lens decentration. Two-dimensional RPREs were measured with an open-field autorefractor at 67 points, covering the central 60 x 30 degrees of the visual field. The bidimensional RPRE vector components: M, J(0) and J(45) of the difference between the values obtain…

MaleRefractive errorMaterials sciencegenetic structuresContact LensesRefraction OcularMyopia progressionlaw.inventionCorneaYoung Adult03 medical and health sciencesCellular and Molecular Neuroscience0302 clinical medicineFractalOpticslawMyopiamedicineHumansContact lensesbusiness.industryCorneal TopographyTwo-dimensional mapsmedicine.diseaseRefractioneye diseasesSensory SystemsSagittal planePeripheralVisual fieldLens (optics)OphthalmologyFractalsmedicine.anatomical_structureAutorefractorFISICA APLICADADisease Progression030221 ophthalmology & optometryFemalesense organsVisual FieldsFractalMATEMATICA APLICADAbusiness030217 neurology & neurosurgeryPeripheral refractive errorCurrent Eye Research
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Diseño de una nueva prueba para medir la función de sensibilidad al contraste con iPad

2015

[EN] Purpose: To introduce a new application (ClinicCSF) to measure Contrast Sensitivity Function (CSF) with tablet devices, and to compare it against the Functional Acuity Contrast Test (FACT). Methods: A total of 42 subjects were arranged in two groups of 21 individuals. Different versions of the ClinicCSF (.v1 and .v2) were used to measure the CSF of each group with the same iPad and the results were compared with those measured with the FACT. The agreements between ClinicCSF and FACT for spatial frequencies of 3, 6, 12 and 18 cycles per degree (cpd) were represented by Bland---Altman plots. Results: Statistically significant differences in CSF of both groups were found due to the change…

AdultMalemedia_common.quotation_subjectVision DisordersVisual performanceFACTDesempeño visualCycles per degreeContrast SensitivityYoung Adultlcsh:OphthalmologyStatisticsHumansContrast (vision)lcsh:QC350-467Tablet devicesDiagnosis Computer-AssistedSensitivity (control systems)Simulationmedia_commonContrast sensitivity functionDispositivos de tabletaVision TestsMiddle AgedFunctional acuity contrast testConfidence intervalTest (assessment)Función de sensibilidad al contrasteiPadlcsh:RE1-994Computers HandheldFISICA APLICADAOriginal ArticleFemaleSpatial frequencyPsychologyEFAClcsh:Optics. LightOptometry
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Comparison of two different devices to assess intraocular lenses

2016

[EN] In this paper, we have compared the performance of two commercial systems, Kaleo-I and IOLA Plus, in the characterization of monofocal intraocular lenses (IOLs) according to the International Standard requirements (ISO 11979-2). The dioptric power (DP) and the Modulation Transfer Function (MTF) at 100.1p/mm and 3.0 mm aperture have been measured with both instruments in twenty commercial monofocal HEMA IOLs and their agreement was assessed by Bland Altman analysis. Compared with the designed power, IOLA Plus gave lower values in 85% of measures: Kaleo I errors are dependent on the power of the lens: measurements were higher than the designed power in the low-medium power range and lowe…

Aperture01 natural scienceslaw.invention010309 optics03 medical and health sciencesMonofocal intraocular lens0302 clinical medicineOpticslawOptical transfer function0103 physical sciencesElectrical and Electronic EngineeringBland–Altman plotInternational standard and reliabilityMathematicsDioptric powerbusiness.industryModulation transfer functionAtomic and Molecular Physics and OpticsConfidence intervalElectronic Optical and Magnetic MaterialsLens (optics)Intraocular lensesFISICA APLICADA030221 ophthalmology & optometrybusiness
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Perfiles de potencia de las lentes de contacto medidas con NIMO TR1504

2017

This study was supported by the Ministerio de Economía y Competitividad and FEDER (Grant DPI2015-71256-R) and by the Generalitat Valenciana (Grant PROMETEOII-2014-072), Spain.

Contact LensesComputer sciencebusiness.industryRefraction OcularRefraction03 medical and health sciencesOcular physiology0302 clinical medicineOpticslcsh:Ophthalmologylcsh:RE1-994FISICA APLICADA030221 ophthalmology & optometryHumanslcsh:QC350-467businessScientific LetterAlgorithmsSoftware030217 neurology & neurosurgerylcsh:Optics. LightOptometry
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Visual acuity and contrast sensitivity screening with a new iPad application

2016

We present a new iPad application (app) for a fast assessment of Visual Acuity (VA) and Contrast Sensitivity (CS) whose reliability and agreement was evaluated versus a commercial screening device (Optec 6500). The measurement of VA was programmed in the app in accordance with the Amblyopia Treatment Study protocol. The CS was measured with sinusoidal gratings of four different spatial frequencies: 3, 6, 12 and 18 cpd at the same contrast values of the Functional Acuity Contrast Test (FACT) included in the Optec 6500. Forty-five healthy subjects with monocular corrected visual acuities better than 0.2 logMAR participated in the agreement study. Bland-Altman analyses were performed to assess…

medicine.medical_specialtyVisual acuityVisual acuitygenetic structuresComputer sciencemedia_common.quotation_subject01 natural sciences010104 statistics & probability03 medical and health sciences0302 clinical medicineOphthalmologymedicineContrast (vision)Computer visionContrast sensitivity0101 mathematicsElectrical and Electronic Engineeringmedia_commonbusiness.industryLimits of agreementHealthy subjectsFunctional acuity contrast testHuman-Computer InteractioniPadHardware and ArchitectureTreatment studyFISICA APLICADA030221 ophthalmology & optometryScreeningSpatial frequencyArtificial intelligencemedicine.symptombusinessSensitivity (electronics)
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