July 1995
Volume 36, Issue 8
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Articles  |   July 1995
Functional characteristics of blue-on-yellow perimetric thresholds in glaucoma.
Author Affiliations
  • J Felius
    Graduate School of Neurosciences, University of Amsterdam, Netherlands.
  • L A de Jong
    Graduate School of Neurosciences, University of Amsterdam, Netherlands.
  • T J van den Berg
    Graduate School of Neurosciences, University of Amsterdam, Netherlands.
  • E L Greve
    Graduate School of Neurosciences, University of Amsterdam, Netherlands.
Investigative Ophthalmology & Visual Science July 1995, Vol.36, 1665-1674. doi:
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    • Get Citation

      J Felius, L A de Jong, T J van den Berg, E L Greve; Functional characteristics of blue-on-yellow perimetric thresholds in glaucoma.. Invest. Ophthalmol. Vis. Sci. 1995;36(8):1665-1674.

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

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Abstract

PURPOSE: Blue-on-yellow (B-on-Y) perimetry assesses the S-cone visual field under yellow adaptation. Glaucomatous field defects have been shown to appear earlier and to be larger in B-on-Y perimetry than in standard perimetry. An upper limit to the use of B-on-Y perimetry is set by the separation of the S-cones from the M- and L-cones. But, because the S-cones may also input to the luminance channel, the actual separation of the color and luminance channels is unknown. Here, the relative sensitivities of the color and luminance channels under B-on-Y test conditions are measured. METHODS: In 15 eyes with early glaucoma, 19 risk eyes, and 10 normal eyes, B-on-Y thresholds were measured from 0 degrees to 20 degrees eccentric and were compared to pure chromatic (B-in-Y) and achromatic (Y-on-Y) thresholds, obtained under identical yellow adaptation. RESULTS: In normals, B-on-Y thresholds were found to coincide with B-in-Y thresholds; Y-on-Y values were 0.5 log (at 20 degrees) to 0.9 log (at 0 degrees) higher. In the pathologic groups, the differences between B-in-Y and Y-on-Y thresholds were smaller. Pathologic threshold elevation is on average 1.8 times larger for chromatic than for achromatic stimuli. In some cases, the luminance channel takes over detection of the B-on-Y stimulus. CONCLUSIONS: In normals, the B-on-Y stimulus is mediated by the color channel. Takeover of detection by the luminance channel might impose limits on following color defects with B-on-Y perimetry. This takeover may occur before the S-cones become less sensitive than the M- and L-cones and might indicate S-cone input to the luminance channel.

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