Person:
Cedrún Sánchez, Juan Enrique

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First Name
Juan Enrique
Last Name
Cedrún Sánchez
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Óptica y Optometría
Department
Optometría y Visión
Area
Optica
Identifiers
UCM identifierORCIDScopus Author IDWeb of Science ResearcherIDDialnet IDGoogle Scholar ID

Search Results

Now showing 1 - 6 of 6
  • Publication
    Visual Discrimination Increase by Yellow Filters in Retinitis Pigmentosa
    (Lippincott Williams & Wilkins, 2016) Cedrún Sánchez, Juan Enrique; Chamorro Gutiérrez, Eva; Bonnin Arias, Cristina; Aguirre Vilacoro, Victoria; Castro, José J.; Sanchez Ramos, Celia
    PURPOSE: The objective of this study was to evaluate, by halometry and under low illumination conditions, the effects of short-wavelength light absorbance filters on visual discrimination capacity in retinitis pigmentosa patients. METHODS: This was an observational, prospective, analytic, and transversal study on 109 eyes of 57 retinitis pigmentosa patients with visual acuity better than 1.25 logMAR. Visual disturbance index (VDI) was determined using the software Halo 1.0, with and without the interposition of filters which absorb (totally or partially) short-wavelength light between 380 and 500 nm. RESULTS: A statistically significant reduction in the VDI values determined using filters which absorb short-wavelength light was observed (p < 0.0001). The established VDIs in patients with VA logMAR <0.4 were 0.30 ± 0.05 (95% CI, 0.26–0.36) for the lens alone, 0.20 ± 0.04 (95% CI, 0.16–0.24) with the filter that completely absorbs wavelengths shorter than 450 nm, and 0.24 ± 0.04 (95% CI, 0.20–0.28) with the filter that partially absorbs wavelengths shorter than 450 nm, which implies a 20 to 33% visual discrimination capacity increase. In addition, a decrease of VDI in at least one eye was observed in more than 90% of patients when using a filter. CONCLUSIONS: Short-wavelength light absorbance filters increase visual discrimination capacity under low illumination conditions in retinitis pigmentosa patients. Use of such filters constitutes a suitable method to improve visual quality related to intraocular light visual disturbances under low illumination conditions in this group of patients. © 2016 American Academy of Optometry
  • Publication
    Fundamentos y técnicas biomicroscópicas para el análisis del globo ocular y anejos
    (2021-09-29) Carballo Álvarez, Jesús; Cedrún Sánchez, Juan Enrique; Bella Gala, Rafael; Peral Cerdá, Assumpta; Cuiña Sardiña, Ricardo
    Describe las características del Biomicroscopio, también llamado Lámpara de hendidura junto a las diversas técnicas quu se pueden realizar para la observación y estudio de los medios oculares. En el enlace de Youtube siguiente se pueden consultar los videos divulgativos fruto de este Proyecto de innovación realizado en la Facultad de Óptica y Optometría de la UCM
  • Publication
    Retinosis pigmentaria: optimización de la función visual mediante lentes ópticas especiales
    (Universidad Complutense de Madrid, 2019-06-18) Cedrún Sánchez, Juan Enrique; Chamorro Gutiérrez, Eva; Sánchez-Ramos Roda, Celia
    La Retinosis Pigmentaria (RP) es una distrofia retiniana rara bilateral sin tratamiento, de curso lento y progresivo, generalmente de inicio en la edad escolar, pudiendo causar ceguera en la quinta década de vida. Sin embargo, dentro de las distrofias de retina, la Retinosis Pigmentaria es la enfermedad genética más prevalente. Está causada por mutaciones en genes clave para la supervivencia y/o función de los fotorreceptores (principalmente bastones). Funcionalmente, la enfermedad se inicia como pérdida de la visión en condiciones de baja iluminación (ceguera nocturna) y reducción concéntrica del campo visual en la periferia media de la retina. Posteriormente se presenta una progresiva pérdida de campo visual y finalmente una pérdida de agudeza visual que conduce a ceguera parcial o total.Desde el punto de vista clínico, es necesario evaluar la función visual mediante test de agudeza visual (AV), campo visual (CV), refracción, visión del color, estereopsis y sensibilidad al contraste (SC) para analizar la evolución de la enfermedad mediante el seguimiento de sus síntomas principales: deslumbramiento, problemas de orientación y movilidad por la reducción del CV, reducción de la AV principalmente en condiciones de bajo contraste y alteración de los colores; siendo esta pérdida de la función visual más acentuada en condiciones de baja iluminación...
  • Publication
    Creación de material audiovisual para el Campus Virtual y plataformas educativas en aras de que los estudiantes de grado, posgrado y profesionales de la visión dominen el análisis ocular con biomicroscopio
    (2022-09-30) Carballo Álvarez, Jesús; Bella Gala, Rafael; Cuiña Sardiña, Ricardo; Durán Prieto, Elena; Peral Cerdá, Assumpta; Valverde Megías, Alicia; Cedrún Sánchez, Juan Enrique
    Edición y publicación de videos explicando los fundamentos y técnicas del biomicroscopio ocular con el análisis de la salud superficial del polo anterior ocular y las imágenes biomicroscópicas y fluoroscópicas para la correcta adaptación de lentes de contacto.
  • Publication
    Variations in Lens Thickness Affecting the Anterior Chamber Length and Their Potential Measurement Using a Biometer
    (MDPI, 2023-12-07) F. Javier Povedano Montero; Ricardo Bernardez Villaboa; Gema Martínez Florentín; Francisco López Muñoz; Juan E. Cedrún Sánchez; Povedano Montero, Francisco Javier; Martínez Florentín, Gema; Cedrún Sánchez, Juan Enrique
    Biometry is a critical aspect of ophthalmology, since it facilitates the measurement of several ocular parameters and aids in the diagnosis of conditions like glaucoma. The advent of the IOLMaster in 1999 marked a pivotal moment in biometry by introducing non-contact and highly precise measurements that revolutionized the field. Low-coherence optical reflectometry devices such as Lenstar LS900 and Aladdin have further advanced biometry, due to the exceptional accuracy they offer. Axial length, a fundamental measurement in biometry, directly correlates with conditions like myopia and glaucoma. The accurate measurement of axial length is crucial for diagnosis and treatment planning. Biometry also guides intraocular lens power calculation during cataract surgery, relying on factors like axial length, anterior chamber depth, lens thickness, and effective lens position (ELP). Ensuring precision in these measurements is essential for optimal surgical outcomes. While several studies have explored biometric parameters, dynamic changes in crystalline lens thickness during rest or accommodation have received little attention. These changes may have a significant effect on the measurement of the anterior chamber length, and consequently impact the overall biometric assessment. This study delves into dynamic biometry, particularly in the context of age-related presbyopia, and aims to assess the feasibility of incorporating into the biometric process a specialized device capable of accurately considering crystalline lens changes during different states like rest and accommodation. This exploration seeks to enhance the understanding of ocular dynamics and contribute to improving the precision of diagnostic and surgical techniques. It underscores the importance of staying at the forefront of biometric research, especially in the context of emerging technologies and their potential to transform ophthalmology.
  • Publication
    Relationships between mesopic visual sensitivity and macular inner and outer retinal layer thickness in healthy younger, middle-aged and older adults
    (John Wiley & Sons, 2023-10-10) Cedrún Sánchez, Juan Enrique; Moreira Estebaranz,Carolina; Remis Gonzalez, Melisa; Puell Marín, María Cinta
    Purpose: To examine relationships between mesopic visual sensitivity measurements on microperimetry and macular inner and outer retinal layer (IRL and ORL) thicknesses in healthy younger, middle-aged and older subjects. Methods: In total, 154 healthy adults were divided into three age groups each with similar mean sensitivity. Regional retinal sensitivity (determined by mesopic fundus-controlled microperimetry) and IRL (ganglion cell-related layer) and ORL thicknesses were measured in the five subfields: central fovea (1 mm diameter) and the quadrants temporal, nasal, superior and inferior of a parafoveal ring of outer diameter 3 mm and inner diameter 1 mm. Relationships between regional sensitivity and corresponding IRL and ORL thicknesses were assessed through a univariate and multivariate linear regression model. Results: Visual sensitivity means for each subfield differed across age groups (all p < 0.001). In each parafoveal ring quadrant, mean IRL thickness was reduced in the older eyes compared to the other groups (all p < 0.0001). In the inferior region, worse sensitivity was correlated with greater IRL thickness (p = 0.0207) in the middle-aged group and with a thicker ORL (p < 0.0001) and thinner IRL (p = 0.0003) in the older eyes (R2 = 0.51). The slopes of regression lines relating sensitivity to IRL thickness and age group (p = 0.0027) or to ORL thickness and age group (p = 0.0020) differed significantly. Conclusions: The relationship observed between mesopic visual sensitivity and retinal layer thickness varied with age. A worse sensitivity was related to a thicker macular IRL layer in middle-aged eyes and to a thicker ORL and thinner IRL in older eyes. Keywords: Aging; Differential Luminance Sensitivity; Healthy Eye; Mesopic; Microperimetry; Optical Coherence Tomography; Retinal Thickness.