Document Detail

Chromatic-Spatial Vision of the Aging Eye.
MedLine Citation:
PMID:  19844600     Owner:  NLM     Status:  Publisher    
The human visual system undergoes continuous anatomical, physiological and functional changes throughout the life span. There is also continuous change in the spectral distribution and intensity of light reaching the retina from infancy through senescence, primarily due to changes in the absorption of short-wave light by the lens. Despite these changes in the retinal stimulus and the signals leaving the retina for perceptual analysis, color appearance is relatively stable during aging as measured by broadband reflective or self-luminous samples, the wavelengths of unique blue and yellow, and the achromatic locus. Measures of ocular media density for younger and older observers show, indeed, that color appearance is independent of ocular media density. This may be explained by a renormalization process that was demonstrated by measuring the chromaticity of the achromatic point before and after cataract surgery. There was a shift following cataract surgery (removal of a brunescent lens) that was initially toward yellow in color space, but over the course of months, drifted back in the direction of the achromatic point before surgery. The spatial characteristics of color mechanisms were quantified for younger and older observers in terms of chromatic perceptive fields and the chromatic contrast sensitivity functions. Younger and older observers differed with small spots or with chromatic spatial gratings near threshold, but there were no significant differences with larger spots or suprathreshold spatial gratings.
John S Werner; Peter B Delahunt; Joseph L Hardy
Publication Detail:
Journal Detail:
Title:  Optical review     Volume:  11     ISSN:  1349-9432     ISO Abbreviation:  Opt Rev     Publication Date:  2004 Jul 
Date Detail:
Created Date:  2009-10-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101514079     Medline TA:  Opt Rev     Country:  -    
Other Details:
Languages:  ENG     Pagination:  226-234     Citation Subset:  -    
Department of Ophthalmology and Section of Neurobiology, Physiology & Behavior, University of California, Davis, 4860 Y Street, Suite 2400, Sacramento, CA 95817, U.S.A.
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Grant Support
R37 AG004058-20//NIA NIH HHS

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