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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 17, Iss. 11 — Nov. 1, 2000
  • pp: 1918–1932

Senescence of foveal and parafoveal cone sensitivities and their relations to macular pigment density

John S. Werner, Michelle L. Bieber, and Brooke E. Schefrin  »View Author Affiliations


JOSA A, Vol. 17, Issue 11, pp. 1918-1932 (2000)
http://dx.doi.org/10.1364/JOSAA.17.001918


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Abstract

Foveal and parafoveal increment thresholds were measured for 50 observers (12–88 years of age) under conditions that isolated retinal mechanisms dominated by short- (S-), middle- (M-), or long- (L-) wave-sensitive cones. Thresholds were obtained on the plateau of the threshold-versus-intensity function of each isolated mechanism and were referred to the retina by using individual measurements of ocular media and macular pigment density. Age-related increases in foveal thresholds, specified at the retina, were found for all three cone mechanisms. Parallel sensitivity losses for each cone mechanism were also observed at 4° and 8° in the temporal retina. A significant positive correlation was found between foveal macular pigment density and the S-cone, but not the M- and L-cone, log sensitivity difference (0°8°) specified at the retina. This relation is expected from the hypothesis that the macular pigment protects the photoreceptors from senescent losses in sensitivity. However, because this result is independent of age, it is interpreted as being due to local gain changes resulting from differential filtering of incident light by the macular pigment between the fovea and the parafovea.

© 2000 Optical Society of America

OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1720) Vision, color, and visual optics : Color vision
(330.5310) Vision, color, and visual optics : Vision - photoreceptors

History
Original Manuscript: January 28, 2000
Revised Manuscript: June 1, 2000
Manuscript Accepted: June 1, 2000
Published: November 1, 2000

Citation
John S. Werner, Michelle L. Bieber, and Brooke E. Schefrin, "Senescence of foveal and parafoveal cone sensitivities and their relations to macular pigment density," J. Opt. Soc. Am. A 17, 1918-1932 (2000)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-17-11-1918

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