Document Detail

Stiles-Crawford effect and the bleaching of cone pigments.
MedLine Citation:
PMID:  5571926     Owner:  NLM     Status:  MEDLINE    
1. The efficiency of light entering the eye through various points in the pupil (Stiles-Crawford effect) was studied using two criteria: (a) visual brightness judged by flicker fusion and (b) the rate of cone pigment bleaching measured by reflexion densitometry.2. Both measurements were made in the same apparatus with the same geometry of presentation and both gave the same Stiles-Crawford effect.3. This suggests that the densitometer measures pigment deep in the outer segments of the cones where light is absorbed for vision.4. Foveal cones seem all to point in the same direction, since the fraction of pigment bleached by light entering the pupil at any one point is the same when measured by light entering anywhere.
J R Coble; W A Rushton
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of physiology     Volume:  217     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  1971 Aug 
Date Detail:
Created Date:  1971-11-17     Completed Date:  1971-11-17     Revised Date:  2011-08-24    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  231-42     Citation Subset:  IM    
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MeSH Terms
Flicker Fusion
Macula Lutea
Photoreceptor Cells / physiology*
Retinal Pigments / physiology*
Reg. No./Substance:
0/Retinal Pigments

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