January 1994
Volume 35, Issue 1
Free
Articles  |   January 1994
Confirmation of the validity of the psychophysical light scattering factor.
Author Affiliations
  • D Whitaker
    Department of Vision Sciences, University of Aston, Birmingham, United Kingdom.
  • D B Elliott
    Department of Vision Sciences, University of Aston, Birmingham, United Kingdom.
  • R Steen
    Department of Vision Sciences, University of Aston, Birmingham, United Kingdom.
Investigative Ophthalmology & Visual Science January 1994, Vol.35, 317-321. doi:
  • Views
  • PDF
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      D Whitaker, D B Elliott, R Steen; Confirmation of the validity of the psychophysical light scattering factor.. Invest. Ophthalmol. Vis. Sci. 1994;35(1):317-321.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

PURPOSE: To reevaluate the validity of the light scatter factor (LSF) formula of Paulsson and Sjöstrand, LSF = L/E (M2/M1-1), where L is the target luminance, E is the illuminance of the glare source at the eye, and M2 and M1 are modulation contrast thresholds measured with and without the glare source, respectively. This equation has recently been deemed invalid by Yager, Yuan, and Mathews. METHOD: Ratios of contrast thresholds with and without glare were measured for three glare illuminance levels for each of three stimulus luminances. This results in five different ratios of L/E, spanning a range of 1.60 log units. RESULTS: The data show an excellent fit to the Paulsson and Sjöstrand equation, and the LSF scores conform well to previously published normative values. CONCLUSION: The light scatter factor equation of Paulsson and Sjöstrand is confirmed as valid without resorting to the need for correction factors based on variables such as pupil size.

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×