Quantitative and functional influence of surround luminance on the letter contrast sensitivity function
| Autor: | Juan A. Aparicio, Santiago Mar, J. G. Vizmanos, Lidia Padierna, V. R. González, Luis Issolio, José A. Menéndez, Beatriz M. Matesanz, I. Arranz |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Adult
Male genetic structures Otras Ingenierías y Tecnologías media_common.quotation_subject Visual Acuity INGENIERÍAS Y TECNOLOGÍAS Luminance Contrast Sensitivity Young Adult Optics CONTRAST SENSITIVITY Psychophysics Humans Contrast (vision) Sensitivity (control systems) Lighting media_common Vision Binocular business.industry Vision Tests Pupil size Glare (vision) Pupil Sensory Systems Ophthalmology VISION Neural function PSYCHOPHYSICS Female Spatial frequency business Psychology GLARE Optometry |
| DOI: | 10.1111/j.1475-1313.2009.00707.x |
| Popis: | Aim: To determine the influence of surround luminance on the letter contrast sensitivity function. Method: The binocular contrast sensitivities of 31 young and ocularly healthy individuals were measured with letters of sizes calculated to obtain the targeted fundamental frequencies of 3, 10, 20, and 30 c deg-1, respectively; with surround luminances from 1 to 1000 cd m-2, always with a test chart background luminance of 200 cd m -2. Results: The letter contrast sensitivity increased with surround luminance up to 100 cd m-2 and decreased when surround luminance increased from 100 to 1000 cd m-2. These increments are larger for higher fundamental spatial frequencies, while decrements are similar for all frequencies. To analyse pupil size influence, results were compared with theoretical predictions obtained by combining different ocular MTFs with a typical neural function, where pupil size decrease leads to letter contrast sensitivity increments and veiling luminance causes the observed decrements. Other possible optical or neural factors that influence these values have also been considered. Conclusions: Letter contrast sensitivity function depends on surround luminance and this influence should be considered in future standardized directives. Fil: Juan Antonio Aparicio. No especifica; Fil: Isabel Arranz. No especifica; Fil: Beatriz Matezanz. No especifica; Fil: Juan Vizmanos. No especifica; Fil: L Padierna. No especifica; Fil: V. Gonzáles. No especifica; Fil: Juan Menéndez. No especifica; Fil: Santiago Mar. No especifica; Fil: Issolio, Luis Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto de Investigación en Luz, Ambiente y Visión. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Instituto de Investigación en Luz, Ambiente y Visión; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología. Departamento de Luminotecnia, Luz y Visión; Argentina |
| Databáze: | OpenAIRE |
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