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
43 results
Search Results
Now showing 1 - 10 of 43
Publication Percepción de la profundidad(2020-02-14) Puell Marín, María CintaSe 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 CintaSe 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 CintaEn 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 Cambios en la función visual debidos al envejecimiento (parte I): visión del color, adaptación a la oscuridad y campo visual.(2021-04-29) Puell Marín, María CintaPublication Enfermedades sistémicas debidas al envejecimiento, factores de riesgo y manifestaciones oftálmicas.(2021-04-29) Puell Marín, María CintaPublication 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 JesusPurpose.: 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 CintaEn 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 CintaSe 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 deThe 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 CintaSe 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.