Document Detail

Blur discrimination of the human eye in the near retinal periphery.
MedLine Citation:
PMID:  15630404     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Although blur discrimination in the foveal region has been investigated, knowledge regarding the effect of retinal eccentricity is limited. METHODS: The initial blur discrimination threshold and the blur detection threshold were assessed psychophysically and compared at the fovea and in the near retinal periphery (up to 8 degrees) with accommodation paralyzed. RESULTS: The blur discrimination and blur detection thresholds increased progressively with retinal eccentricity, with the latter being about twice as large and increasing twice as fast as the former. However, the group mean blur ratio between these two parameters remained relatively constant (0.56) with retinal eccentricity. CONCLUSIONS: The more sensitive blur discrimination vs. blur detection findings may be attributed to variation in the optical modulation transfer function with retinal defocus and to a perceptually based blur-buffering mechanism. The reduced blur sensitivity found with increased retinal eccentricity might be attributed to cone photoreceptor/ganglion cell sampling limitations, sharpness overconstancy, reduced visual attention, and slightly degraded visual optics.
Bin Wang; Kenneth J Ciuffreda
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Optometry and vision science : official publication of the American Academy of Optometry     Volume:  82     ISSN:  1040-5488     ISO Abbreviation:  Optom Vis Sci     Publication Date:  2005 Jan 
Date Detail:
Created Date:  2005-01-04     Completed Date:  2005-03-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  52-8     Citation Subset:  IM    
Department of Vision Sciences, SUNY/State College of Optometry, New York, New York 10036, USA.
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MeSH Terms
Discrimination (Psychology)
Fovea Centralis / physiology
Psychophysics / methods
Retina / physiology*
Sensory Thresholds
Visual Acuity*

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

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