Document Detail

Meridional differences in the directional sensitivity of the human color mechanisms.
MedLine Citation:
PMID:  3252735     Owner:  NLM     Status:  MEDLINE    
The directional sensitivity (DS) of the red (pi 5), green (pi 4), and blue (pi 1) color mechanisms was measured for both the horizontal and vertical pupil meridians, thus localizing the peak of each pi-mechanism DS function within the two-dimensional pupillary aperture. In the horizontal meridian, there were greater differences among observers in DS function peak locations than there were for any one observer. Along the vertical meridian, peak location differences within observers were similar to those found in the horizontal meridian, whereas among-observer differences were much smaller. Significant differences between horizontal and vertical DS function halfwidths were also found for at least one pi-mechanism of each observer. It is concluded that meridional variations exist in either the morphology or orientational distribution of foveal photoreceptors, and that more than one alignment mechanism is responsible for photoreceptor orientation in the human fovea.
G A Geri; G L Kandel; C R Genter; H E Breed
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  American journal of optometry and physiological optics     Volume:  65     ISSN:  0093-7002     ISO Abbreviation:  Am J Optom Physiol Opt     Publication Date:  1988 Nov 
Date Detail:
Created Date:  1989-08-01     Completed Date:  1989-08-01     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0417614     Medline TA:  Am J Optom Physiol Opt     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  880-9     Citation Subset:  IM    
University of Dayton Research Institute, Higley, Arizona.
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MeSH Terms
Accommodation, Ocular
Color Perception*
Color Perception Tests
Middle Aged
Photoreceptor Cells / physiology
Pupil / physiology*
Visual Acuity
Visual Fields
Visual Perception
Grant Support

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