Senescence of spatial chromatic contrast sensitivity. I. Detection under conditions controlling for optical factors

Joseph L. Hardy, Peter B. Delahunt, Katsunori Okajima, John S Werner

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Chromatic contrast thresholds for spatially varying patterns of various spatial frequencies (0.5, 1, 2, and 4 cycles per degree) were measured for ten older (65-77 yr of age) and ten younger (18-30 yr of age) observers. The stimuli were Gabor patches modulated along S-varying or (L - M)-varying chromatic axes. Thresholds were determined for two sets of stimuli. For one set of stimuli, the mean chromaticity and luminance were equated at the cornea for all observers. The second set of stimuli was corrected for ocular media density differences to equate stimulation of each of the three cone types at the retina for each individual. Chromatic contrast thresholds were higher for older observers for all stimuli tested. The magnitude of this difference showed little dependence on spatial frequency. When stimuli were equated at the cornea, this difference was greater for S-varying stimuli. When stimuli were equated at the retina, the age-related difference in thresholds for S-varying stimuli was reduced. Both optical and neural factors contribute to these age-related losses in spatial chromatic contrast sensitivity.

Original languageEnglish (US)
Pages (from-to)49-59
Number of pages11
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume22
Issue number1
DOIs
StatePublished - 2005

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Vision and Pattern Recognition

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