Inferred positive phototropic activity in human photoreceptors

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
J M Enoch, D G Birch

Abstract

The Stiles-Crawford (S.-C.) function, a measure of the directional sensitivity of the retina, was used to infer the alignment characteristics of the sampled retinal elements. One assumes that the peak of the photopic S.-C. function reflects the central alignment tendency of renal elements sampled, and that the shape of the function reflects, among other factors, distributive qualities. Here two tests were performed to determine whether the function sampled reflected positive phototropic activity. The natural eye pupil was dilated and artificial pupils were substituted having specified eccentricity from the centre of the natural pupil. This was achieved with a displaced iris contact lens. After a series of complex experiments, it was finally shown that the peaks of the S.-C. function shifted towards the displaced aperture of the contact lens. As a second test, individuals were occluded uniocularly with a black patch for periods of time up to 10 days. This caused remarkable flattening of the measured S.-C. function. That flattening occurred in determinations of both photopic and scotopic S.-C. functions. Comparable effects were not seen in the second eye or if a diffuser was substituted for the black patch. Change and recovery in...Continue Reading

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Citations

Jan 1, 1987·Vision Research·J M EnochS Yamade
Mar 23, 2006·Proceedings of the National Academy of Sciences of the United States of America·K BizhevaW Drexler
Sep 4, 2008·Proceedings. Biological Sciences·Gerald Westheimer
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Aug 9, 2001·Nature·H S SmallmanP Doyle
May 14, 1985·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·J M Enoch, D G Birch
May 5, 2009·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Jean-Marie Gorrand, Michel Doly
Oct 1, 1995·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·M RyndersL N Thibos
Dec 18, 2020·Science Advances·Zuying ChaiKing-Wai Yau

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