Document Detail

Cone interaction and color substitution as revealed by pattern ERG.
MedLine Citation:
PMID:  2361599     Owner:  NLM     Status:  MEDLINE    
Transient electroretinograms to a reversing color-contrast checkerboard pattern (P-ERG) were recorded in a protanomalous, a deuteranomalous, and a normal observer. Alternate monochromatic checks were of constant wavelength (630 nm red-531 nm green), while the relative energies were varied systematically. When changing the radiance ratio 630 nm-531 nm of the stimulus, the normal subject exhibited a P-ERG to all stimuli with only a relative amplitude minimum at a distinct radiance ratio, whereas the color-deficient observers failed to show a P-ERG at some color contrast 630 nm-531 nm, the radiance ratio of which was different in the protan and deutan. From the radiance ratio of color contrast for the smallest potential in the normal observer, we conclude that the green- and red-sensitive cone mechanism provides a difference signal which generates the response. The data from the color-deficient observer support the view that color discrimination in protans and deutans is reduced because the input of one type of photoreceptor is missing.
G Niepel; A Päärmann; E Dodt
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie     Volume:  228     ISSN:  0721-832X     ISO Abbreviation:  Graefes Arch. Clin. Exp. Ophthalmol.     Publication Date:  1990  
Date Detail:
Created Date:  1990-08-08     Completed Date:  1990-08-08     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8205248     Medline TA:  Graefes Arch Clin Exp Ophthalmol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  264-9     Citation Subset:  IM    
Max-Planck-Institut für physiologische und klinische Forschung, W.G. Kerckhoff-Institut, Bad Nauheim, Federal Republic of Germany.
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MeSH Terms
Color Vision Defects / physiopathology*
Contrast Sensitivity
Iris / metabolism
Pattern Recognition, Visual
Photic Stimulation
Photoreceptor Cells / physiopathology*

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