Person:
Puell Marín, María Cinta

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First Name
María Cinta
Last Name
Puell Marín
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 - 10 of 43
  • Publication
    Percepción de la profundidad
    (2020-02-14) Puell Marín, María Cinta
    Se describen las fuentes de información sobre la percepción de la profundidad tales como las claves monoculares, claves de movimiento, claves oculomotoras, claves binoculares y disparidad binocular o estereopsis.
  • Publication
    Procesamiento retino-cortical de la señal visual
    (2019-12-27) Puell Marín, María Cinta
    Se describen las características y funciones de las neuronas en las vías Magno y Parvo de retina y núcleo geniculado lateral, las características del campo receptor de las neuronas corticales simples, complejas e hipercomplejas, la organización modular del área visual primaria (V1) y las vías de información y procesamiento en la corteza extraestriada.
  • Publication
    La visión del color del ojo humano
    (2020-02-08) Puell Marín, María Cinta
    En este tema se tratan las propiedades de la percepción del color del sistema visual humano, la tricomacia, las mezclas o igualación de colores, el sistema CIE de especificación del color y diagrama cromático, las discriminaciones cromáticas, los efectos cromáticos, la adaptación cromática y constancia del color, el contraste de color y las bases fisiológicas de la visión del color basadas en las señales tricromáticas y el procesamiento del color oponente.
  • Publication
    Impaired Mesopic Visual Acuity in Eyes with Early Age-Related Macular Degeneration
    (The Association for Research in Vision and Ophthalmology, Inc., 2012) Puell Marín, María Cinta; Barrio de Santos, Ana Rosa; Palomo Álvarez, Catalina; Gomez-Sanz, Fernando J; Clement-Corral, Amaya; Perez Carrasco, Maria Jesus
    Purpose.: To determine photopic and mesopic distance high-contrast visual acuity (HC-VA) and low-contrast visual acuity (LC-VA) in eyes with early age-related macular degeneration (AMD). Methods.: Measurements were made in 22 subjects with early AMD and 28 healthy control subjects. Inclusion criteria included a photopic HC-VA of 20/25 or better. Distance VA was measured using HC (96%) and LC (10%) Bailey-Lovie logMAR letter charts under photopic (85 cd/m2) and mesopic (0.1–0.2 cd/m2) luminance conditions. Results.: Mean mesopic distance HC-VA and LC-VA were significantly worse (0.1 logMAR and 0.28 logMAR, respectively) in the early AMD group than in the control group. Under mesopic conditions, the mean difference between LC-VA and HC-VA was significantly greater in the early AMD (0.45 logMAR) than the control group (0.27 logMAR). Mean differences between mesopic versus photopic HC-VA and mesopic versus photopic LC-VA were significantly greater in the early AMD than the control group (0.13 and 0.32 logMAR of difference between the means, respectively). Sensitivity and specificity were significantly greater for mesopic LC-VA than for mesopic HC-VA (Receiver Operating Characteristics, area under the curve [AUC], 0.94 ± 0.030 and 0.76 ± 0.067, respectively). AUC values for photopic HC-VA and LC-VA were below 0.70. Conclusions.: Visual acuity testing under low luminance conditions emerged as an optimal quantitative measure of retinal function in early AMD.
  • Publication
    Aspectos temporales de la visión
    (2020-02-09) Puell Marín, María Cinta
    En este tema se estudia la sensibilidad a los cambios temporales en el contraste describiendo primero las características de la rejilla de onda sinusoidal temporal y después la función de sensibilidad al contraste temporal. Se describe el concepto de frecuencia crítica de fusion (FCF) y cuáles son los efectos de la iluminación retiniana (ley de Ferry-Porter) y área del estímulo (ley de Granit-Harper) en la FCF. También se describen las fases de latencia, establecimiento y persistencia de la evolución de la sensación luminosa.
  • Publication
    Sensibilidad luminosa espectral del sistema visual
    (María Cinta Puell Marín, 2018-11-21) Puell Marín, María Cinta
    Se describen las funciones de eficiencia luminosa fotópica y escotópica, la relación entre la sensibilidad espectral y la absorción espectral de los fotopigmentos de los conos y bastones de la retina. También se describe la selectividad direccional a la luz de los fotorreceptores y se comentan las magnitudes fotométricas fundamentales.
  • Publication
    The acute effect of cocoa and red-berries on visual acuity and cone-mediated dark adaptation in healthy eyes
    (Elsevier, 2021-04-10) Puell Marín, María Cinta; Pascual-Teresa, Sonia de
    The retina is a highly vascularized tissue with a high metabolic and oxygen demand responsible for human vision. Considering that the polyphenolic flavanols and anthocyanins have been shown to be beneficial for endothelial function and cerebral blood-flow, an acute randomized and controlled crossover trial with two different sources of polyphenols, anthocyanins from red-berries and flavanols from cocoa, was designed to better understand the effect of polyphenols on visual acuity (VA) and cone-mediated dark adaptation (DA). Thirty-seven healthy subjects (22.1 ± 2.0 years old) participated in the acute intervention for three times (red-berries, cocoa or vehicle-control) with a washout period of two weeks in-between. VA under photopic and low luminance (mesopic) conditions, DA or dynamic of recovery of contrast threshold (CT) following near-total photopigment bleach for 5 min, urine total polyphenols, theobromine and antioxidant power were measured in the three study-arms after 2-hours ingestion of the study-food. 3-hours postprandial urine showed higher levels of total polyphenols after ingestion of cocoa flavanols or red-berries anthocyanins in comparison with the vehicle-control and higher levels of theobromine only for the cocoa group. There was an increase in photopic VA with cocoa flavanols that with red-berries anthocyanins did not reach statistical significance. Both, cocoa and red berries, failed to improve mesopic VA and the cone time constant for contrast recovery and final CT of DA.
  • Publication
    Umbral de luminancia diferencial y adaptación a la luz
    (2020-02-08) Puell Marín, María Cinta
    Se describe el umbral de luminancia diferencial, la ley de Weber, la adaptación a la luz y sus mecanismos, la constancia de la luminosidad y los tipos de deslumbramiento.