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Manuel Rodriguez-Vallejo

Manuel Rodriguez-Vallejo
Qvision · Ophthalmology Department at Virgen del Mar Hospital

PhD

About

69
Publications
9,837
Reads
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380
Citations
Introduction
Diploma in Optics and Optometry, Master in Advanced Optometry and Vision Sciences, and PhD by the programme in “Design build and project management of industrial processes”, at the Polytechnic University of Valencia (Spain). Author of several peer review papers in international scientific journals about "Design and characterization of multifocal contact lenses and multifocal intraocular lenses", "design of eye tests for measuring visual performance" and "corneal biomechanics". Co-author of book chapters from the "Sociedad Española de Cirugía Ocular Implanto-Refractiva", "Sociedad Española de Oftalmología", Jaypee Brothers Medical Publisher and he has participated as a speaker in several international congresses. Nowadays, he is Research Manager at Qvision and owner of test-eye.com
Additional affiliations
January 2015 - present
Qvision
Position
  • Project Manager
February 2014 - present
University of Valencia
Position
  • Technician
Description
  • 1.- Design of New Multifocal Contact Lenses 2.- Characterization o new contact lenses in model eyes. 3.- Development of Toolboxes for Keratron Scout and WAM 5500. 4.- Measurement of Peripheral Refractive Error with and without optical compensations.
February 2013 - December 2013
Universitat Politècnica de València
Position
  • Technician
Description
  • 1.- Characterization of new Multifocal IOLs Designs by Objective Measurement Methods. 2.- Design of New Multifocal Contact Lenses 3.- Theoretical Eye Models with Zemax 13 4.- Programming toolboxes for connecting Corneal Topographers and Matlab.

Publications

Publications (69)
Article
Full-text available
The aim of this study was to assess the stability and differences between objective (O-Rx) and subjective (S-Rx) refraction for the assessment of the prediction error (PE). A secondary aim was to report the results of a monofocal intraocular lens (IOL). 100 subjects were included for whom S-Rx and O-Rx were obtained for all visits, and for visual p...
Article
Full-text available
Purpose To assess the influence in paired design studies of formulae comparison for intraocular lens (IOL) power calculation of using a single formula for deciding the implanted power with monofocal (mIOL) and multifocal (MIOL) lenses. Design Retrospective observational. Methods Ninety-six right eyes were retrospectively analyzed. Eyes were assig...
Article
The aim of this study was to collect the scientific literature on the correction of presbyopia with laser in situ keratomileusis (presbyLASIK) in last years and to analyse the quality of such scientific evidence using a validated methodology for conducting a systematic review. A total of 42 articles were initially identified, but after applying the...
Article
Purpose: To assess the influence of reliability (repeatability and reproducibility) of eye parameter measurements on the prediction refraction by using the outcomes of nine optical biometers reported in the literature. Methods: A search was conducted in PubMed focused on the outcomes from original studies regarding reliability. The mean populati...
Article
Purpose: To conduct a critical review of the peer-reviewed literature on the use of supplemental multifocal intraocular lenses in the ciliary sulcus. Methods: This systematic review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement recommendations. According to the inclusion and...
Article
Full-text available
PurposeTo assess the degree of posterior capsular opacification (PCO) and its influence on contrast sensitivity defocus curve (CSDC) after implantation of two trifocal intraocular lenses (IOLs), Alsafit (AT) and Liberty (L), during a 12-month follow-up. A secondary aim was to evaluate the Nd:YAG capsulotomy rate in a long time.Methods Data from 63...
Article
Full-text available
To evaluate the prediction error (PE) obtained in Phacoemulsification (Phaco) or Femtosecond (Femto) surgeries without considering posterior corneal astigmatism correction (non-PCA) versus the correction based on Abulafia-Koch + Medicontur (AK) and Barrett calculators in toric intraocular lens (IOL) power calculation. 58 right eyes were retrospecti...
Article
Purpose to evaluate the prediction error (PE) after applying the Abulafia-Koch formula in an online calculator with and without consideration of anterior corneal surgically induced astigmatism (SIACornea). Methods SIACornea models were calculated with a historical database of 204 right eyes (REs) from a single surgeon, either for manual (2.2 mm) o...
Article
Full-text available
The increase of the depth of focus (DOF) for the treatment of presbyopia or cataracts is a topic of great interest for anterior segment surgeons that have seen how new surgical possibilities to achieve DOF enlargement have emerged. Nowadays, several technologies to extend the DOF are available, from corneal laser refractive surgery (LRS) procedures...
Article
Full-text available
Purpose: To evaluate the agreement between subjective high and low contrast visual acuity (VA) and predicted values from double-pass system measurements in healthy candidates to laser refractive surgery. Methods: Ninety-two eyes measured during the preoperative screening to laser refractive surgery were included in this retrospective analysis. High...
Article
Full-text available
1) Background: To evaluate the efficacy at 6 years postoperative after the implantation of a trifocal intraocular lens (IOL) AT Lisa Tri 839MP. The secondary objective was to evaluate the contrast sensitivity defocus curve (CSDC), light distortion analysis (LDA), and patient reported outcomes (PROs). (2) Methods: Sixty-two subjects participated in...
Article
Introduction Positive dysphotopsia (PD) is a topic of great interest in intraocular lens (IOL) field. Several approaches have been developed from the physics, psychophysics and psychometry fields to measure PD. However, the complexity of characterizing this phenomenon and the lack of standardization have resulted in a considerable bias between stud...
Article
Purpose: To review the scientific literature on the comparison of the efficacy of different corneal collagen crosslinking (CXL) protocols for the treatment of progressive keratoconus. Methods: Systematic review of randomized clinical trials (RCTs) on CXL outcomes. A search was carried out using the Cochrane Library, PubMed, EMBASE, Web of Science,...
Article
Purpose: To evaluate the incidence of central islands after 6-month follow-up of Small Incision Lenticule Extraction (SMILE) and to assess their role in safety and accuracy. Methods: Analysis of the preoperative and postoperative corneal tomography, best spectacle refraction and corrected distance visual acuity of 82 subjects that underwent SMILE....
Article
Concerns regarding the article by Hoffer & Savini: (1) reporting the formula for the implanted intraocularlens (IOL) and clinical trials, (2) the 6-m standard is not in agreement with international standards and (3) how should discretization of PE be performed for calculating cumulative percentages?
Article
PURPOSE: To evaluate the distribution of pupil size in patients implanted with multifocal intraocular lenses (IOLs) and to assess the variations according to age. METHODS: A total of 168 eyes that had implantation of several multifocal IOLs and were measured at the 3-month follow-up visit were included in the analysis. The Keratograph 5M (Oculus Op...
Article
Purpose/Aim to assess, following the standards, the results of safety, efficacy and predictability for a trifocal intraocular lens and to evaluate contrast sensitivity and visual acuity defocus curve. Materials and Methods 50 subjects operated on cataract surgery or refractive lens exchange with a trifocal intraocular lens have been recruited for...
Article
Full-text available
Purpose To assess differences in a new objective metric obtained with a double-pass technique between a group with accommodation insufficiency (AI) and a control group and to explore the diagnostic capabilities of this new tool in comparison to conventional procedures. Methods Retrospective cross-sectional case-control phase 1 study. Two groups wi...
Article
Purpose: To identify the most sensitive visual performance metric for evaluating the pupil-dependency of a multifocal intraocular lens (MIOL) and to determine the pupil measurement method most correlated with such metric. Methods: Twenty-seven right eyes implanted with a MIOL were included in the analysis. Three pupil size measurements were obtaine...
Article
Full-text available
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 vi...
Article
Purpose: To develop a new method that makes it easy to detect accuracy deficiencies of any intraocular lens power calculation formulae and to test it on 9 different formulae. Setting: IOA, Madrid, Spain DESIGN:: Retrospective observational case series. Methods: This study's first stage included 3519 eyes from 3519 candidates to cataract surger...
Article
Purpose: To evaluate whether the prediction of visual performance based on the modulation transfer function area (MTFa) calculated with optical simulations is better correlated with visual acuity or contrast sensitivity obtained from defocus curves in patients implanted with a trifocal intraocular lens. Methods: Biometric eye data from 43 patien...
Article
Full-text available
Purpose: To assess the impact of ocular biometric variables on the visual performance achieved with a low addition trifocal intraocular lens (MIOL). Methods: Retrospective observational study including 34 eyes. Preoperative measured variables included mean corneal power (Km), corneal regular astigmatism (RA), anterior chamber depth (ACD), axial...
Article
Intraocular lens (IOL) opacification is an infrequent complication of cataract surgery. Surface analysis has demonstrated that the opacification of IOLs is related to calcium or phosphate precipitation on or within the lenses, but the associated mechanisms are unknown, and the scientific literature is heterogeneous and limited to case series and re...
Article
Full-text available
Purpose: To identify the sources of error in predictability beyond the effective lens position and to develop two new thick lens equations. Methods: Retrospective observational case series with 43 eyes. Information related to the actual lens position, corneal radii measured with specular reflection and Scheimpflug-based technologies, and the cha...
Article
Purpose: To evaluate the standard clinical outcomes, defocus curves, and satisfaction obtained with a new diffractive low addition trifocal intraocular lens (IOL). Methods: Thirty patients who were implanted with the Versario Multifocal 3F IOL (Valeant Med Sp.zo.o., Warsaw, Poland) were recruited for a prospective observational study at Qvision,...
Article
Full-text available
Objective To evaluate the repeatability of the fast measurement of the visual acuity (VADC) and contrast sensitivity (CSDC) defocus curves with a new test as well as the agreement of measurements at far distance obtained with the Early Treatment Diabetic Retinopathy Study (ETDRS) chart and the ClinicCSF test for measuring Contrast Sensitivity Funct...
Article
Full-text available
Purpose: To assess the agreement in the white‑to‑white (WTW) measurement with two different devices, the reproducibility and the probability of confusing sizing (PCS) in selecting a different implantable collamer lens (ICL). Study Design: Retrospective observational case series. Methods: Images of 192 eyes were captured with both devices. The WTW w...
Article
PURPOSE: To assess the effectiveness of small incision lenticule extraction (SMILE) as a function of the astigmatism level and type. METHODS: A total of 102 right eyes were included in this study. Refractive astigmatism and corneal astigmatism measured with Scheimpflug technology were retrieved from the preoperative visit and the 3-month follow-up...
Article
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 topogra...
Article
Full-text available
PurposeTo assess the agreement and repeatability of two objective systems for measuring the tear film stability. Methods Retrospective analysis of the tear film stability of 99 healthy right eyes measured with a videokeratoscope (VK) and the Optical Quality Analysis System (OQAS, Visiometrics). Two consecutive measures were taken with both systems,...
Article
Full-text available
Dysfunctional lens syndrome (DLS) is a term coined to describe the natural aging changes in the crystalline lens. Different alterations in the refractive properties and transparency of the lens are produced during the development of presbyopia and cataract, such as changes in internal high order aberrations or an increase in ocular forward scatteri...
Article
Purpose/Aim: To evaluate the impact of ocular parameters on the visual performance achieved with the multifocal intraocular lens (IOL) Bi-Flex M 677MY. Materials and Methods: 26 subjects were included in the current study. Several physiological variables were retrieved from the 3-month follow-up visit, including pupil diameter and distance from pu...
Article
Purpose: To evaluate surgically induced astigmatism as computed by means of either simulated keratometry (KSIM) or total corneal refractive power (TCRP) after temporal incisions. Methods: Prospective observational study including 36 right eyes undergoing cataract surgery. Astigmatism was measured preoperatively during the 3-month follow-up period u...
Article
The hypothesis that small-incision lenticule extraction provides better preservation of corneal biomechanics than previous laser refractive techniques has led to a growth in the interest in clinical and experimental research in this field. This hypothesis is based on the fact that corneal layers with greater stiffness are preserved with this new te...
Article
Purpose: To assess the surgically induced astigmatism with femtosecond laser-assisted and manual temporal clear corneal incisions and to evaluate the performance of a model for prediction of the surgically induced astigmatism based on the preoperative corneal astigmatism. Methods: Clinical data of 104 right eyes and 104 left eyes undergoing catara...
Article
Full-text available
Citation: Fernández J, Rodríguez-Vallejo M, Martínez J, Tauste A, Piñero DP. Above-average defocus curves in photopic and mesopic vision with multifocal intraocular lenses after laser assisted in situ keratomileusis. Int J Ophthalmol (Oftalmar) and Vithas Virgen del Carmen (Qvision) hospitals in Spain. I write to describe a case in which the visual...
Article
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....
Article
Full-text available
Purpose: To evaluate parameters and dynamic corneal densitometry with a new dynamic Scheimpflug analyzer (Corvis ST) in eyes having small-incision lenticule extraction (SMILE). Setting: Qvision, Vithas Virgen del Mar Hospital, Almería, Spain. Design: Retrospective case series. Methods: The study comprised eyes from the same institution having small...
Article
Full-text available
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 w...
Thesis
Full-text available
Myopia is the most prevalent refractive error from the age of 20 and impairs clear vision at far distance. Presbyopia, on the other hand, is an anomaly of the visual function that appears from the age of 45, impairs clear vision at near distance, and affects all people for being a natural age associated defect. Multifocal contact lenses represent a...
Article
Full-text available
Purpose: To present a new fast and reliable application for iPad (ST) for screening stereopsis at multiple distances. Methods: A new iPad application (app) based on a random dot stereogram was designed for screening stereopsis at multiple distances. Sixty-five subjects with no ocular diseases and wearing their habitual correction were tested at two...
Article
Full-text available
Objectives: To analyze the whole process involved in the production of a new bifocal Multizone Contact Lens (MCL) for presbyopia. Methods: The optical quality of a new MCL was evaluated by ray tracing software in a model eye with pupil different diameters with the lens centered and decentered. A stock of low addition (+1.5 D) MCL for presbyopia was...
Article
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. Methods: FCLs prototypes were specially manufactured and characterized. This study involved twenty-six myopic subjects ranging from -0.50 D to -7.00 D. The two-dimensiona...
Article
Full-text available
Sports are a very common activity practiced around the world, to such an extent that they are completely integrated into our daily lives. The main reason is because sports practice is good for our health, but sometimes can have some risks that must be taken into account. Particularly, eyes are an irreplaceable organ that could suffer an injury due...
Article
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 lp/mm and 3.0 mm aperture have been measured wi...
Article
Purpose: To evaluate the reliability of measuring CS with uncalibrated iPads. Methods: Six random iPads with retina display were calibrated with a colorimeter and the correlation between Luminance (L) and pixel level (y) was computed according to an exponential function. The mean and confidence interval (±2SD) obtained from the six iPads were ca...
Article
Purpose To determine the safety, efficacy, and predictability of small-incision lenticule extraction at 6-month follow-up, depending on the level of the myopic refractive error. The surgeries were performed by a surgeon new to this technique. Methods Seventy-one subjects with a mean age of 31.86 ± 5.57 years were included in this retrospective obs...
Article
We present a new iPad application (app) for a fast assessment of Visual Acuity (VA) and Contrast Sensitivity (CS) and to evaluate reliability and agreement with a commercial screening device (Optec 6500). The measurement of VAs was programmed in the app in accordance with the Amblyopia Treatment Study protocol. The CS was measured with sinusoidal g...
Article
Eye is the official journal of the Royal College of Ophthalmologists. It aims to provide the practising ophthalmologist with information on the latest clinical and laboratory-based research.
Article
Eye is the official journal of the Royal College of Ophthalmologists. It aims to provide the practising ophthalmologist with information on the latest clinical and laboratory-based research.
Article
Full-text available
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...
Article
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...

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Projects (4)
Project
This project reviews important issues that should be taken into account for testing Visual Acuity and Contrast Sensitivity Defocus Curves in Clinical Research. English site: https://defocuscurve.com/en/ Spanish site: https://defocuscurve.com/es/
Project
Online Course and Toolbox for the Standard Analysis of Refractive Results in Laser Refractive Surgery and Cataract Surgery Link to the Course (English version): https://www.test-eye.com/en/online-courses-udemy/analysis-of-results-in-laser-refractive-surgery-and-cataracts Link to the Course (Spanish version): https://www.test-eye.com/es/cursos-udemy/resultados-cirugia-cataratas-refractiva-laser Link to the Toolbox: https://www.test-eye.com/en/refractive-analysis