ILAV   21219
INSTITUTO DE INVESTIGACION EN LUZ, AMBIENTE Y VISION
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
The speed of adaptation as a function of eccentricity and fields luminances adaptation
Autor/es:
ALEJANDRO GLORIANI; BEATRIZ MATEZANZ; ISABEL ARRANZ; CRISTINA DE LA ROSA; LUIS ISSOLIO; JOSÉ ANTONIO MENÉNDEZ; ALICIA GALINDO; SANTIAGO MAR; JUAN ANTONIO APARICIO
Lugar:
Alghero
Reunión:
Conferencia; European Conference on Visual Perception; 2012
Resumen:
There is a growing interest in studying mesopic since in this range rods and cones are simultaneously active. It has been suggested that rods cone interactions could be responsible for alterations in temporal and spatial visual response. By employing a two-channel Maxwellian view optical system we measured thresholds luminance at a steady adapting field and a transient adapting field (SOA 300), considering retinal eccentricities between 0º and 15º, and adaptation fields from 0.06 to 100 cd/m2. We determined the speed of adaptation as the ratio between the steady and transient thresholds . We found very different functional behaviors with eccentricity for adaptation to mesopic and photopic ranges. While at mesopic levels speed increases from fovea to parafovea and decreases to peripheral retina, for photopic fields speed increases monotonically with eccentricity until 15º. We suggest that this behavior is explained by the different rod and cone distributions and its interaction. Physiology of peripheral cones could be responsible of the increase in the speed with increasing eccentricity but, at lower luminances, rod intrusion could be responsible of the velocity decrease in the peripheral retina.