September 2021
Volume 21, Issue 9
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2021
The integrated Stiles-Crawford effect: understanding the role of pupil size and outer-segment length in foveal vision
Author Affiliations
  • Brian Vohnsen
    Advanced Optical Imaging Group, School of Physics, University College Dublin, Ireland
Journal of Vision September 2021, Vol.21, 1806. doi:https://doi.org/10.1167/jov.21.9.1806
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      Brian Vohnsen; The integrated Stiles-Crawford effect: understanding the role of pupil size and outer-segment length in foveal vision. Journal of Vision 2021;21(9):1806. doi: https://doi.org/10.1167/jov.21.9.1806.

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

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Abstract

The Stiles-Crawford effect of the first kind (SCE-I) describes a psychophysical change in perceived brightness related to the angle of incidence of a ray of light onto the retina. The effect is commonly explained as being due to angular-dependent waveguiding by foveal cones, yet the SCE-I is largely absent from similar-shaped rods suggesting that a different mechanism than waveguiding is at play. To examine this, we have devised a flickering pupil method that directly measures the integrated SCE-I for normal pupil sizes in normal vision rather than relying on mathematical integration of the standard SCE-I function as determined with Maxwellian light. Our results show that the measured effective visibility for normal foveal vision is related to visual pigment density in the three-dimensional retina rather than waveguiding. We confirm the experimental findings with a numerical absorption model using Beer-Lambert’s law for the visual pigments.

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