Age-related changes in the spatial chromatic contrast sensitivity function of detection, measured along S and L – M cone axes, were demonstrated in a companion paper [Hardy, J. Opt. Soc. Am. A 22, 49 (2005)]. Here senescent changes in chromatic contrast appearance were assessed by contrast-matching functions (CMFs). Luminance and chromatic CMFs (S and L – M axes) were compared for younger (age 18–31 yr) and older (age 65–75 yr) trichromatic subjects by using stimuli that were perceptually anchored to the same physical standard contrasts. Subjects matched the contrast of test gratings of various spatial frequencies (0.5–8 cycles per degree) to the standard stimuli under natural viewing conditions. Because of changes in the visual system with age, the standard stimuli were closer to threshold for older subjects; however, in general, the shapes of the CMFs were similar for both groups. The results suggest that the perception of relative contrasts across spatial frequencies is stable with age.
© 2005 Optical Society of America
Original Manuscript: March 19, 2004
Revised Manuscript: June 25, 2004
Published: January 1, 2005
Peter B. Delahunt, Katsunori Okajima, John S. Werner, and Joseph L. Hardy, "Senescence of spatial chromatic contrast sensitivity. II. Matching under natural viewing conditions," J. Opt. Soc. Am. A 22, 60-67 (2005)