Document Detail

Large-field color naming of dichromats with rods bleached.
MedLine Citation:
PMID:  316449     Owner:  NLM     Status:  MEDLINE    
A color-naming method was used to examine the large-field red/green discriminations of dichromats screened with standard tests. The stimulus was a 12 degrees annular field with the central 4 degrees removed, flashed for 300 ms. Four wavelengths were equated in brightness for each observer at two retinal illuminance levels, approximately 10 and 100 trolands. The stimuli were then presented in random order and the observer was asked to name each, using one of four color terms. The entire experiment was done with the observers dark-adapted and also with the rods bleached. For all four deuteranopes and two of four protanopes, color names were very significantly related to both illuminance and wavelength in both adaptation conditions. The relationship between name and wavelength was similar to that of a normal trichromat, but the performance of a dichromat was very poor by comparison. Performance was generally somewhat better in the dark than with the rods bleached. However, the result in the bleached condition is consistent with recent evidence that at least some observers who are classified as dichromats with standard small-field screening procedures actually have a weak residual third cone mechanism.
A L Nagy; R M Boynton
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of the Optical Society of America     Volume:  69     ISSN:  0030-3941     ISO Abbreviation:  J Opt Soc Am     Publication Date:  1979 Sep 
Date Detail:
Created Date:  1980-03-17     Completed Date:  1980-03-17     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7503097     Medline TA:  J Opt Soc Am     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1259-65     Citation Subset:  IM    
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MeSH Terms
Adaptation, Ocular
Color Perception Tests / methods*
Color Vision Defects / diagnosis*
Dark Adaptation
Terminology as Topic
Visual Fields

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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