Person:
González Pérez, Mariano

First Name

Mariano

Last Name

González Pérez

URI

https://hdl.handle.net/20.500.14352/79887

Affiliation

Universidad Complutense de Madrid

Faculty / Institute

Óptica y Optometría

Department

Optometría y Visión

Area

Optica

Identifiers

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Now showing 1 - 10 of 16

Content development for a new item-bank for measuring multifocal contact lens performance
(Journal of Patient-Reported Outcomes, 2024) Albero Ros, Elsa; Lorente Velázquez, Amalia; González Pérez, Mariano
Background: Presbyopia is an age-related condition that causes a decreased ability to focus on nearby objects. Multifocal contact lenses are commonly used to address this issue. However, there seems to be a notable dissatisfaction among multifocal contact lens wearers. The absence of a reliable instrument to measure the patient's perspective, despite the widespread use of this method, highlights the need for further research in this area. Objective: The objective of this study is to develop an item-bank integrating all domains necessary to assess the patient's perspective on multifocal contact lens performance, offering a comprehensive measure. The item-bank will ensure a high level of content validity, be self-administered, and will initially be available in Spanish. The aim of this tool is to serve as a valuable resource for research and optometric clinics, facilitating the follow-up of patients with presbyopia who wear multifocal contact lenses or those who are newly starting to use them. Methodology: The MCL-PRO item bank, followed a systematic and step-wise inductive approach to gather information, following the recommendations outlined in the COSMIN guidelines and similar studies. The process involved the following steps: (1) Literature review and relevant existing items identification (2) Social media review, (3) Semi-structured focus groups, (4) performing qualitative analysis, (5) refining and revising the items, and (6) generating the content of the item bank. Results: A total of 575 items were included in the item-bank hosted under 8 different domains that were found to be important for presbyopic population: visual symptoms (213), activity limitation (111), ocular symptoms (135), convenience (36), emotional well-being (33), general symptoms (16), cognitive issues (21) and economic issues (10). Conclusion: The item-bank created has followed standardised methodology for its development and encloses all the aspects for MCL performance evaluation from patients perspective.
Project number: 9
Desarrollo de método para la evaluación de la rotación de alumnos en hospital universitario para realizar prácticas clínicas
(2019) Garzón Jiménez, Nuria; González Pérez, Mariano; Muñoz Sanz, Miguel Angel; Arriola Villalobos, Pedro; González Blanco, Félix; Villanueva Gómez-Chacón, Celia
El objetivo de este proyecto es el de diseñar y desarrollar un método de evaluación que permita valorar, de manera objetiva, a los alumnos de la asignatura de Prácticas Clínicas del Master de Optometría y Visión de la Facultad de Óptica y Optometría durante la realización de dichas prácticas en un Hospital Universitario con pacientes reales.
Development of an algorithm to track blinks from a face video
(Proceedings. International Online Symposium of Young Optometrists (SIYO 2022), 2022) Marrakchi, Youssef; López Alonso, José Manuel; Garzón Jiménez, Nuria; González Pérez, Mariano; Universidad de Valencia
The VI International Symposium of Young Optometrists (SIYO 2022) took place from November 14-28 2022 in its usual online format. This conference aims to create a space where young optometry students and optometry practitioners are the protagonists. This book of proceedings contains the abstracts of the different contributions to the conference. Its contents are organizing in two sections: invited and sponsored oral communication and workshops, and free communication. This last section is divided in oral communications and poster communications, comprising the conference’s different thematic areas. The Organizing Committee thanks all the young and senior researchers that have contributed their work to the conference, the members of the Scientific Commettee for their careful reviews of the works and the different enterprises and accademic or offical entities that have sponsored this event.
Symptoms associated with reading from a smartphone in conditions of light and dark
(Applied Ergonomics, 2018) Antona Peñalba, Beatriz; Barrio de Santos, Ana Rosa; Gascó Sánchez, Adriana; Pinar Rincón, Ana; González Pérez, Mariano; Puell Marín, María Cinta
Asthenopia symptoms were investigated in visually-normal subjects without computer-related vision symptoms after prolonged reading from: smartphone versus hardcopy under photopic conditions, and smartphone in conditions of ambient versus dark room illumination. After reading from the smartphone, total symptom scores and nine out of ten questionnaire symptoms were significantly worse than for the hardcopy (“blurred vision while viewing the text, “blurred distance vision after the task”, “difficulty in refocusing from one distance to another”, “irritated or burning eyes”, “dry eyes”, “eyestrain”, “tired eyes”, “sensitivity to bright lights” and “eye discomfort”). Mean total symptom scores and scores for “irritated or burning eyes” and “dry eyes” were significantly higher for the dark versus photopic conditions. In conclusion, prolonged smartphone reading could cause worse asthenopic symptoms than reading from a hardcopy under similar conditions. Symptoms could be even worse when reading from a smartphone in the dark.
The Computer-Vision Symptom Scale (CVSS17): Development and Initial Validation
(IOVS (Investigative Ophthalmology & Vision Science, 2014) González Pérez, Mariano; Susi García, María Del Rosario; Antona Peñalba, Beatriz; Barrio de Santos, Ana Rosa; González Díaz-Obregón, Enrique
Purpose.: To develop a questionnaire (in Spanish) to measure computer-related visual and ocular symptoms (CRVOS). Methods.: A pilot questionnaire was created by consulting the literature, clinicians, and video display terminal (VDT) workers. The replies of 636 subjects completing the questionnaire were assessed using the Rasch model and conventional statistics to generate a new scale, designated the Computer-Vision Symptom Scale (CVSS17). Validity and reliability were determined by Rasch fit statistics, principal components analysis (PCA), person separation, differential item functioning (DIF), and item–person targeting. To assess construct validity, the CVSS17 was correlated with a Rasch-based visual discomfort scale (VDS) in 163 VDT workers, this group completed the CVSS17 twice in order to assess test-retest reliability (two-way single-measure intraclass correlation coefficient [ICC] and their 95% confidence intervals, and the coefficient of repeatability [COR]). Results.: The CVSS17 contains 17 items exploring 15 different symptoms. These items showed good reliability and internal consistency (mean square infit and outfit 0.88–1.17, eigenvalue for the first residual PCA component 1.37, person separation 2.85, and no DIF). Pearson's correlation with VDS scores was 0.60 (P < 0.001). Intraclass correlation coefficient for test–retest reliability was 0.849 (95% confidence interval [CI], 0.800–0.887), and COR was 8.14. Conclusions.: The Rasch-based linear-scale CVSS17 emerged as a useful tool to quantify CRVOS in computer workers.
The 17-Item Computer Vision Symptom Scale Questionnaire (CVSS17): Translation, Validation and Reliability of the Italian Version
(International Journal of Environmental Research and Public Health, 2022) Rossi, Gemma Caterina Maria; Bettio, Federica; González Pérez, Mariano; Briola, Aba; Pasinetti, Gemma Ludovica Maria; Scudeller, Luigia
Background. To validate the 17-item Computer Vision Symptom Scale questionnaire (CVSS17) in Italian. Methods. Cross-sectional validation study on video terminal (VDT) users and a reference sample of subjects not working at a VDT (control group), cognitively able to respond to a health status interview. The Italian self-administered version of the CVSS17 questionnaire was administered to all participants. The reliability and validity of the Italian translation of the CVSS17 were tested using standard statistical methods for questionnaire validation. The Rasch analysis was performed as well. Results. A total of 216 subjects were enrolled. Concerning the reliability, the Cronbach’s alpha coefficient was 0.925 (from 0.917 to 0.924), and the test–retest stability was 0.91 (<0.001). Concerning the validity, the control group had significantly better scores, and there were good correlations between responses to the CVSS17 and analogous domains of the GSS. Conclusion. The Italian version of the CVSS17 has shown psychometric properties comparable to those of the Spanish version, having good validity, discriminatory power, internal consistency and reliability. The questionnaire is a specific measure of vision-related quality of life in Italian-speaking VDT workers and can be used both in clinical practice and for research purposes.
Desarrollo y validación de una escala para medir la sintomatología visual asociada al uso de videoterminales en el trabajo
(2015) González Pérez, Mariano; Antona Peñalba, Beatriz; Susi García, Rosario; Barrio de Santos, Ana Rosa
OBJETIVOS: 1) Elaborar una escala para medir la sintomatología visual y ocular asociada al uso de PVD con el menor número de ítems posible que sea válida, fiable y aplicable a sujetos en edad laboral (18-65 años). Además, debe ser breve y fácil de comprender y adecuada para la administración electrónica. 2 ) Estudiar la validez de la nueva escala. 3)Estudiar la repetibilidad de la nueva escala a través del análisis de la repetibilidad test-retest MÉTODOS: Se creó un cuestionario piloto siguiendo el procedimiento recomendado para el desarrollo de instrumentos basados en repuestas proporcionadas por lo pacientes (PRO). Lo completaron 636 sujetos y se evaluaron sus respuestas según el modelo de Rasch y estadísticas convencionales para crear la escala CVSS17. La validez y la fiabilidad se analizaron mediante el ajuste al modelo de Rasch, el ¿análisis de componentes principales¿ (PCA), el índice de separación para los sujetos, el ¿funcionamiento diferencial de los ítems¿ (DIF) y el ajuste entre la dificultad de los ítems y la habilidad de los sujetos. La validez concurrente de la CVSS17 se estudió analizando la correlación entre la nueva escala y otras variables relacionadas con la visión. La validez para grupos conocidos comparando las puntuaciones en la CVSS17 de los trabajadores menores de 41 años con las de los mayores de 54 años. Para evaluar la validez convergente, la CVSS17 se correlacionó con una escala de molestias visuales (VDS) y también se estudió la correlación entre la CVSS17 y el Índice de Enfermedad de Superficie Ocular (IESO12). La fiabilidad test¿retest fue estimada a partir del cálculo del coeficiente de correlación intraclase (ICC) con su intervalo de confianza al 95 por ciento y del coeficiente de repetibilidad (COR). RESULTADOS: Los 17 ítems de la CVSS17 investigan 15 síntomas diferentes, han demostrado buena repetibilidad y consistencia interna (Infit y Outfit en el intervalo [0.88¿1.17]), el autovalor del primer contraste del análisis PCA de los resultados era 1,37, la separación para los sujetos era 2.85; y no había DIF. Se han definido seis estratos de sintomatología diferentes y el análisis factorial muestra dos factores principales, uno relacionado son la superficie ocular y otro con la refracción y la acomodación. Se mostró una correlación estadísticamente significativa con la amplitud de acomodación (rPearson=-0.34) y con la diferencia entre la amplitud de acomodación registrada y la teórica (rPearson=-0.372). El estudio de la validez para grupos conocidos demostró la capacidad de la CVSS17 para detectar diferencias estadísticamente significativas. El coeficiente de correlación de Pearson entre la CVSS17 y la VDS fue 0.60 y con la IESO12 0.65. La repetibilidad el ICC fue 0.85 y el COR 8,14. CONCLUSIONES: 1) Se ha creado la escala CVSS17, el primer instrumento PRO destinado a medir los SOV asociados al uso de PVD en el trabajo. 2) La CVSS17 proporciona medidas válidas que conforman una variable de intervalo y ofrece una buena repetibilidad. 3) La escala CVSS17 está libre de DIF por género y por grupo de edad (présbitas-no présbitas). 4) La CVSS17 es breve, fácil de comprender y puede administrarse en formato electrónico a los trabajadores usuarios de PVD. 5) La escala presenta seis niveles de sintomatología estadísticamente distintos. 6) El intervalo de confianza al 95 por ciento para la media poblacional de la CVSS17, está entre 30.1 y 31.4 unidades. 7) En el conjunto de SOV asociados al uso de PVD se distinguen dos factores principales, uno relacionado con la sequedad ocular y otro con la acomodación y la refracción. 8) La sequedad ocular, la amplitud de acomodación y la refracción son las principales fuentes de SOV asociados al uso de PVD en el trabajo. 9) Los trabajadores usuarios de PVD con mayor edad tienen un mayor nivel de sintomatología.
Subjective behavioral measures in myopic and pre-myopic children before and after the COVID lockdown
(Frontiers in Medicine, 2023) Clara Martinez Perez; Cesar Villa Collar; Ana Gonzalez Abad; Álvarez Peregrina, Cristina; Ruiz Pomeda, Alicia; Prieto Garrido, Francisco Luis; González Pérez, Mariano; Sánchez Tena, Miguel Ángel
Background: There are environmental factors that may contribute to the onset of myopia. This study aims to evaluate the children’s lifestyle changes before and after the COVID-19 lockdown and how they can influence their vision. Methods: The same questionnaire was administered to children aged between 5 and 7 in Spain every year in September before (2017–2019) and after the COVID-19 lockdown (2020–2021). All the children also passed a vision exam consisting of the measurement of visual acuity (VA) and determination of objective and subjective refraction. Children were classified as myopes, pre-myopes, or hyperopes. The cut-off points to define the refractive error were established according to the value of the spherical equivalent (SE): hyperopia (SE > +0,75D), myopia (SE ≤ −0,5D), or pre-myopia (−0.5D < SE ≥ +0.75D). Data analysis is performed with the SPSS 27.0 software (SPSS Inc., Chicago, Illinois). Results: In the pre-COVID period, the pre-myopes were the ones who spent the longest time outdoors, and after the COVID lockdown, there were no differences between groups. There neither were any differences in the time spent doing near-work activities between the groups in both periods (p > 0.05). Regarding the spherical equivalent, in the pre-COVID period, the mean value was 0.75 ± 2.09D and after the COVID lockdown, it was 0.47 ± 1.88D (p < 0.001). Conclusion: Pre-myopes spent more time outdoors than myopes in the pre-COVID period, while myopes spent more time using digital devices. All these differences do not exist after the COVID lockdown, with a general increase in the time spent outdoors and a decrease in the use of digital devices. Further studies are needed to know if these lifestyle changes remain and how they influence the onset of myopia. Copyright © 2023 Alvarez-Peregrina, Ruiz-Pomeda, Martinez-Perez, Prieto-Garrido, Villa-Collar, González-Pérez, González-Abad and Sánchez-Tena.
Prevalence and Estimation of the Evolution of Myopia in Spanish Children
(Journal of Clinical Medicine, 2024) Sánchez Tena, Miguel Ángel; Martinez Perez, Clara; Villa Collar, César; González Pérez, Mariano; González Abad, Ana; Álvarez Peregrina, Cristina; Alain Afflelou, Grupo de Investigación
Background: In recent decades, myopia has turned into a public health issue across the world. Between 1993 and 2016, the percentage of myopes increased from 10.4% to 34.2%. This study aims to analyze the myopia prevalence in Spanish children from five to seven years old over the last five years and to predict the rate of myopia in Spain by 2030. Methods: The sample consisted of children aged between 5 and 7, who underwent an optometric examination consisting of the measurement of visual acuity (VA) and determination of objective and subjective refraction. The cut-off points to define refractive error are established by the spherical equivalent (SE) value: hyperopia for an SE over or equal to +0.50 D; myopia for an SE under or equal to −0.50 D; and emmetropia when the SE is between −0.50 D and +0.50 D. Results: The myopia rate in Spanish children aged between five and seven was 19%. Myopia prevalence progressively increased as children grew up (p ≤ 0.001). It is estimated that, in the year 2030, the rate of myopia will be 30.2% [CI: 25.3–35.0], of which 81.9% [CI: 78.3–85.3] will have low myopia, 10.0% [CI: 7.2–12.8] moderate myopia, and 7.3% [CI: 4.9–9.7] high myopia. Conclusions: Nineteen percent of Spanish children between five and seven are myopes. In 2030, is expected that 30.2% of Spanish children between 5 and 7 years of age will be myopes. These estimations will support eye care professionals in recommending that children spend more time outdoors to prevent the onset of myopia and the use of methods to control myopia to avoid reaching these figures of high myopia.
Project number: 357
Aprendizaje guiado para la aplicación de ejercicios de Terapia Visual con un kit básico de tratamiento
(2020) Barrio De Santos, Ana Rosa; Antona Peñalba, Beatriz; Sánchez Pérez, María Isabel; Piedrahita Alonso, María Elena; González Pérez, Mariano