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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 3, Iss. 8 — Aug. 18, 2008

Effect of glare on simple reaction time

Rolando C. Aguirre, Elisa M. Colombo, and José F. Barraza  »View Author Affiliations

JOSA A, Vol. 25, Issue 7, pp. 1790-1798 (2008)

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We systematized the study of the effect of glare on reaction time (RT), for visual conditions similar to the ones found during night driving: Mesopic range of adaptation ( 0.14 cd m 2 ) , glare levels of the order of those produced by car headlights ( E G = 15 , 60 lx), suprathreshold luminance contrasts, and a variety of spatial frequencies covering the selected range of visibility (1, 2, 4, and 8 c deg ). We found that for the no-glare situation, RT increases with decreasing contrast and increasing spatial frequency, which agrees with previous findings. When data are plotted as a function of the inverse of contrast, RT varies linearly, with k—the RT-contrast factor of Pieron’s law—representing the slope of the lines. The effect of glare on RT is an increase in the slope of these lines. This effect is different for each spatial frequency, which cannot be accounted for in the classic approach considering that glare can be replaced by a single veiling luminance. We show that the effect of glare on RT must be modeled by an equivalent glare luminance that depends on spatial frequency.

© 2008 Optical Society of America

OCIS Codes
(330.1070) Vision, color, and visual optics : Vision - acuity
(330.1800) Vision, color, and visual optics : Vision - contrast sensitivity
(330.6100) Vision, color, and visual optics : Spatial discrimination
(330.6130) Vision, color, and visual optics : Spatial resolution

ToC Category:
Vision, color, and visual optics

Original Manuscript: September 21, 2007
Revised Manuscript: April 22, 2008
Manuscript Accepted: May 8, 2008
Published: June 26, 2008

Virtual Issues
Vol. 3, Iss. 8 Virtual Journal for Biomedical Optics

Rolando C. Aguirre, Elisa M. Colombo, and José F. Barraza, "Effect of glare on simple reaction time," J. Opt. Soc. Am. A 25, 1790-1798 (2008)

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