December 2011
Volume 11, Issue 15
Free
OSA Fall Vision Meeting Abstract  |   December 2011
Determining Heterochromatic Flicker Photometry Frequency for Macular Pigment Optical Densitometry by Critical Flicker Fusion Frequency
Author Affiliations
  • Kevin O'Brien
    University of Georgia, Psychology
  • Bill Smollon
    Brown University, Psychology
  • Bill Wooten
    Brown University, Psychology
  • Billy Hammond
    University of Georgia, Psychology
Journal of Vision December 2011, Vol.11, 55. doi:10.1167/11.15.55
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      Kevin O'Brien, Bill Smollon, Bill Wooten, Billy Hammond; Determining Heterochromatic Flicker Photometry Frequency for Macular Pigment Optical Densitometry by Critical Flicker Fusion Frequency. Journal of Vision 2011;11(15):55. doi: 10.1167/11.15.55.

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      © 2016 Association for Research in Vision and Ophthalmology.

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Abstract

Accurate clinical assessment of Macular Pigment Optical Density (MPOD) using Heterochromatic Flicker Photometry (HFP) requires the HFP stimulus be presented at or near a specific “ideal” frequency. If the frequency is too low, fusion never occurs and the task is difficult for naive patients. If the frequency is too high, fusion occurs in a wide range of values, and measurement error is high. Determining this frequency is time consuming and difficult to determine in a clinical setting. Critical Flicker Fusion (CFF) frequency is easy to assess using standard densitometry equipment in naive patients. By correlating CFF and the “ideal” frequency for HFP densitometry for a given densitometer, HFP frequency selection can be made quickly and accurately from the comparatively easier CFF assessment. A methodology for determining “ideal” HFP frequency was developed using a Macular Metrics II (tm) Macular Pigment Optical Densitometer. “Ideal” HFP frequencies show positive correlation to CFF frequency allowing a straightforward algorithm to be derived.

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