ILAV   21219
INSTITUTO DE INVESTIGACION EN LUZ, AMBIENTE Y VISION
Unidad Ejecutora - UE
artículos
Título:
Brightness reduction as a function of the angular position of a glare source
Autor/es:
LUIS ISSOLIO; JULIANA MATRANGA; PABLO BARRIONUEVO; SILVIANA COMASTRI; GABRIEL MARTIN; ELISA COLOMBO
Revista:
Optica Pura y Aplicada
Editorial:
Sociedad Española de Optica
Referencias:
Año: 2009 vol. 42 p. 33 - 39
ISSN:
0030-3917
Resumen:
The effect of intraocular scattering of light generated at a peripheral glare source is quantified using a model empirically formulated in terms of the veiling luminance. This luminance is directly proportional to the illuminance generated at the eye by this source and inversely proportional to the square of the eccentricity angle subtended by the source with the visual axis. In previous articles the effect of brightness reduction due to the presence of a glare source subtending 10º is analyzed and it results that this effect increases when the illuminance generated by the source increases. In the present paper the dependence of brightness reduction on the eccentricity angle of a transient glare source generating 60lux at the eye is investigated. A method of magnitudes comparison, consisting in comparing the perceived brightness of a stimulus of variable luminance presented without glare to that of a reference stimulus presented simultaneously with glare, is employed. For 5 emmetropic young adults it results that, when the angle decreases from 15º to 7.5º, the matching luminance decreases as predicted by the veiling luminance model. This would indicate that the brightness reduction phenomenon is strongly dependent on the veil produced by the glare source. The results obtained are compared to those of other authors found under stable glare conditions.