Document Detail

Retest variability of human infant contrast sensitivity: how many tests are sufficient?
MedLine Citation:
PMID:  10701807     Owner:  NLM     Status:  MEDLINE    
Retest variability of a new infant contrast sensitivity (CS) card procedure was assessed by binocular measurement of a group of 20 6-month-olds twice within a 1-week period. Coefficient of reliability analyses showed that within-subject variability between tests was only slightly less than variation across subjects, which suggests that results from a single test are a poor predictor of an infant's "true" visual functioning. To determine how many tests are needed to estimate when infant CS stabilizes to within an acceptable (0.15 log unit) criterion, a second experiment was conducted in which a small group of subjects was tested repeatedly over a 2-week period. The results showed that averaging performance on 2 to 3 tests was required before an accurate estimate of the subject's performance could be obtained. Our results suggest that caution should be taken in the interpretation of a single measurement of infant visual functioning.
R J Adams; M L Courage; J R Drover
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Optometry and vision science : official publication of the American Academy of Optometry     Volume:  77     ISSN:  1040-5488     ISO Abbreviation:  Optom Vis Sci     Publication Date:  2000 Feb 
Date Detail:
Created Date:  2000-03-29     Completed Date:  2000-03-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8904931     Medline TA:  Optom Vis Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  90-5     Citation Subset:  IM    
Department of Psychology, Memorial University of Newfoundland, St. John's, Canada.
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MeSH Terms
Contrast Sensitivity / physiology*
Observer Variation
Reproducibility of Results
Vision Tests / standards*
Vision, Binocular / physiology

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

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