Influence of retinal eccentricity on disability glare recovery

ISABEL ARRANZ; BEATRIZ MATEZANZ; LUIS ISSOLIO; JOSÉ BARRAZA; SANTIAGO MAR; JOSÉ ANTONIO APARICIO

Regensburg, Alemania

Conferencia; ECVP 2009; 2009

Universidad de Regensburg

The evolution of the detection threshold is well known to depend on the time between onset of a transient adaptation field and that of a signal detection stimulus (SOA). Most of the existing information concerns foveal response and the scarce available data concerning extrafoveal behaviour show that in this area the adaptation process is slower than in the fovea [Bichao et al, 1995 Journal of the Optical Society of America 12(10) 2252 - 2258]. This work provides information about the disability glare effect on different retinal eccentricities considering mesopic range of adaptation. A two maxwellian view system has been designed which allows to measure detection thresholds in presence of transient or steady adapting beams. Detection thresholds (td) were measured for 0°, 3°, 6°, 9°, 12° and 15° of temporal eccentricity considering dark adaptation (DA), steady light adaptation (LA) and transient light adaptation (SOA 300) in two normal subjects. Results show that there is a range of eccentricities between 3° and 10° where the periphery adapts faster than the fovea and the further periphery. The rise of the thresholds at the periphery for steady light adaptation indicates the prevalence of cones and the density and the sizes of them in each retinal location could explain our findings.