On the spectral relation between the first and second Stiles-Crawford effect

The first Stiles-Crawford effect describes the psychophysical visibility dependence on pupil point for a narrow beam of light incident on the eye. Its distribution function commonly attributed to photoreceptor waveguiding is characterized by a point of maximum visibility typically near the pupil cen...

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Bibliographic Details
Published inJournal of modern optics Vol. 56; no. 20; pp. 2261 - 2271
Main Author Vohnsen, B.
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis Group 20.11.2009
Taylor & Francis Ltd
Subjects
bleaching
Eyes & eyesight
hue shift
Light
Optics
photoreceptor waveguiding
Retina
retinal modelling
Stiles-Crawford effect
vision modelling
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Summary:The first Stiles-Crawford effect describes the psychophysical visibility dependence on pupil point for a narrow beam of light incident on the eye. Its distribution function commonly attributed to photoreceptor waveguiding is characterized by a point of maximum visibility typically near the pupil centre and a wavelength-dependent directionality parameter. The second Stiles-Crawford effect describes a minor hue shift of obliquely incident light commonly attributed to pigment screening that accompanies observations of the first Stiles-Crawford effect. Here the first Stiles-Crawford effect and the wavelength dependence of its directionality parameter are examined in terms of photoreceptor waveguiding. Its distribution function is analyzed to derive characteristic features of the second Stiles-Crawford effect directly from the spectrum of the directionality parameter. The results obtained are independent of the exact physical mechanisms underlying both effects but do support a major role played by waveguiding. Finally, the influence of bleaching is discussed in relation to the model and to pigment screening.
ISSN:0950-0340
1362-3044
DOI:10.1080/09500340902990049