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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Stephen A. Burns
  • Vol. 26, Iss. 5 — May. 1, 2009
  • pp: 1260–1267

Alignment parameters of foveal cones

Jean-Marie Gorrand and Michel Doly  »View Author Affiliations

JOSA A, Vol. 26, Issue 5, pp. 1260-1267 (2009)

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In the fovea we measured the orientation and directional characteristics of photoreceptors with an optical technique in a group of 29 subjects. At 6 deg eccentricity, we determined the direction of the normal to the inner limiting membrane (ILM) by analyzing light reflected specularly by the ILM. We found a strong correlation between the orientation of photoreceptor axes and the direction of the normal to the ILM. Therefore, we cannot answer the question of the mechanism of photoreceptor alignment without taking into account the direction of the normal to the underlying retinal pigment epithelium, in addition to phototropic and apodization processes. For a wavelength of 532 nm , the mean value of the directionality factor ρ was 0.212 mm 2 (SD: 0.026 mm 2 ) when measured at the fovea ( 2 deg sample field). We look for reasons likely to explain the discrepancy between ρ values given by different optical methods.

© 2009 Optical Society of America

OCIS Codes
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5310) Vision, color, and visual optics : Vision - photoreceptors
(330.7331) Vision, color, and visual optics : Visual optics, receptor optics

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: October 16, 2008
Revised Manuscript: March 7, 2009
Manuscript Accepted: March 26, 2009
Published: April 28, 2009

Virtual Issues
Vol. 4, Iss. 7 Virtual Journal for Biomedical Optics

Jean-Marie Gorrand and Michel Doly, "Alignment parameters of foveal cones," J. Opt. Soc. Am. A 26, 1260-1267 (2009)

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