Effect of glare on reaction time for peripheral vision at mesopic adaptation

AGUIRRE ROLANDO C; COLOMBO ELISA M.; BARRAZA JOSÉ F.

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION - (Print)

OPTICAL SOC AMER

Año: 2011 vol. 28 p. 2187 - 2191

1084-7529

When a bright light is present in the field of view, visibility is dramatically reduced. Many studies have inves- tigated the effect of glare on visibility considering foveal vision. However, the effects on peripheral vision have received little attention. In a previous work [J. Opt. Soc. Am. A 25, 1790 (2008)], we showed that the effect of glare on reaction time (RT) for foveal vision at mesopic adaptation depends on the stimulus spatial frequency. In this work, we extend this study to peripheral vision. We measured the RT of achromatic sinusoidal gratings as a func- tion of contrast for a range of spatial frequency, and eccentricity, and fortwo glare levels, in addition to the no-glare condition. Data were fitted with Piéron’s law, following a linear relationship. We found that glare increases the slope of these lines for all conditions. These slopes seem to depend critically on eccentricity for 4 cycles=degree (c= deg), but not for 1 and 2 c= deg. We explain our results in terms of the contrast sensitivity (gain) of the under- lying detection mechanisms. © 2011 Optical Society of America25, 1790 (2008)], we showed that the effect of glare on reaction time (RT) for foveal vision at mesopic adaptation depends on the stimulus spatial frequency. In this work, we extend this study to peripheral vision. We measured the RT of achromatic sinusoidal gratings as a func- tion of contrast for a range of spatial frequency, and eccentricity, and fortwo glare levels, in addition to the no-glare condition. Data were fitted with Piéron’s law, following a linear relationship. We found that glare increases the slope of these lines for all conditions. These slopes seem to depend critically on eccentricity for 4 cycles=degree (c= deg), but not for 1 and 2 c= deg. We explain our results in terms of the contrast sensitivity (gain) of the under- lying detection mechanisms. © 2011 Optical Society of America’s law, following a linear relationship. We found that glare increases the slope of these lines for all conditions. These slopes seem to depend critically on eccentricity for 4 cycles=degree (c= deg), but not for 1 and 2 c= deg. We explain our results in terms of the contrast sensitivity (gain) of the under- lying detection mechanisms. © 2011 Optical Society of America4 cycles=degree (c= deg), but not for 1 and 2 c= deg. We explain our results in terms of the contrast sensitivity (gain) of the under- lying detection mechanisms. © 2011 Optical Society of America