December 2002
Volume 43, Issue 13
ARVO Annual Meeting Abstract  |   December 2002
Luminance Spatial Scale and Local Stereopsis
Author Affiliations & Notes
  • C Liu
    Psychology McGill University Montreal PQ Canada
  • RF Hess
    Ophthalmology McGill Vision Research Montreal PQ Canada
  • Y-Z Wang
    Retina Foundation of the Southwest Dallas TX
  • Footnotes
    Commercial Relationships   C. Liu, None; R.F. Hess, None; Y. Wang, None. Grant Identification: RFH is funded by CIHR (M\T108-18)
Investigative Ophthalmology & Visual Science December 2002, Vol.43, 4675. doi:
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    • Get Citation

      C Liu, RF Hess, Y-Z Wang; Luminance Spatial Scale and Local Stereopsis . Invest. Ophthalmol. Vis. Sci. 2002;43(13):4675.

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

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Abstract: : Purpose: To investigate the effects of spatial frequency, overall contrast energy and overall stimulus size on normal stereo-sensitivity. Methods: Stereo-sensitivity thresholds (Dmin) was measured using a 1 interval, 2AFC, method of constant stimuli, in which an area of fractal noise was presented in front or behind the fixation plane. The spatial frequency characteristics of the noise were varied using ideal lowpass or high pass filters. Results: Dmin is affected by lowpass filtering but not by highpass filtering, suggesting a possible spatial-frequency/disparity correlation. This was confirmed by obtaining an identical result using filtered images adjusted for equal overall energy. By using stimulus patches of different sizes we show that this spatial frequency/disparity correlation extends over the entire spatial frequency range that could be represented by our stimuli. Conclusion: Dmin exhibits a spatial frequency/disparity correlation extending from at least 0.5 c/deg to at least 10c/deg, consistent with there being multiple spatial channels capable of encoding stereopsis across this range.

Keywords: 329 binocular vision/stereopsis • 586 spatial vision 

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