Document Detail


Relative contributions of optical and neural limitations to human contrast sensitivity at different luminance levels.
MedLine Citation:
PMID:  8273296     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The relative contributions of optical and neural constraints on human contrast sensitivity as a function of spatial frequency were assessed for a range of luminances. First, the overall two-dimensional contrast sensitivity function (CSF) was obtained for three eyes at three luminances (0.05, 0.5 and 20 cd/m2) using a standard two-alternative forced-choice procedure. Second, the two-dimensional modulation transfer function (MTF) of the optics was measured for the same eyes and pupil sizes using a hybrid optical-digital method. The two-dimensional neural transfer function (NTF) was obtained as the ratio between the CSF and the MTF. Minor factors, such as the effect of cone aperture, were also considered in the computations. Our results show that at all luminances, the fall off in contrast sensitivity at high spatial frequencies is mainly due to optical factors. The losses in contrast sensitivity with decreasing luminance are, however, primarily due to noise limitations.
Authors:
M A Losada; R Navarro; J Santamaría
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  33     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1993 Nov 
Date Detail:
Created Date:  1994-02-02     Completed Date:  1994-02-02     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  2321-36     Citation Subset:  IM    
Affiliation:
Instituto de Optica, C.S.I.C., Madrid, Spain.
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MeSH Terms
Descriptor/Qualifier:
Contrast Sensitivity / physiology*
Fovea Centralis / physiology
Humans
Light
Pattern Recognition, Visual / physiology
Photometry
Pupil / physiology
Retinal Rod Photoreceptor Cells / physiology
Rotation
Sensory Thresholds / physiology

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


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