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Reliability of the response AC/A ratio determined using nearpoint autorefraction and simultaneous heterophoria measurement.
MedLine Citation:
PMID:  12482317     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Clinicians frequently assess the accommodative convergence to accommodation (AC/A) ratio using near phoria measurements and accommodative stimuli. The purpose of this study was to evaluate the repeatability of AC/A ratio measurements and to compare the response AC/A ratio to stimulus AC/A ratios determined two different ways. METHODS: Heterophorias and accommodative responses to different stimuli were measured simultaneously on eight subjects at two visits. A Canon Auto Ref R-1 autorefractor was used to measure accommodative response, while vergence posture was measured using the modified Thorington heterophoria technique. These results were used to calculate response-slope, stimulus-slope and stimulus-gradient AC/A ratios and the means of these ratios for each session were compared. Correlations between the response AC/A ratios and the stimulus AC/A ratios were calculated. RESULTS: The mean response AC/A ratios for the two sessions were 3.8 prism dioptres per dioptre for each session. The correlation between the slope-determined ratios was 0.56, and between the response-slope and the stimulus-gradient AC/A ratios the correlation was -0.03. The regression equation for the slope-determined AC/A ratios was calculated. CONCLUSIONS: Means for the two sessions were not significantly different for any of the AC/A ratios. The response-slope and stimulus-slope AC/A ratios had a moderately significant correlation and a predictive regression equation was determined. The stimulus-gradient AC/A ratios were not correlated with the response-slope AC/A ratios.
Authors:
Bill B Rainey; David A Goss; Melinda Kidwell; Brian Feng
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Clinical & experimental optometry : journal of the Australian Optometrical Association     Volume:  81     ISSN:  1444-0938     ISO Abbreviation:  Clin Exp Optom     Publication Date:    1998 Sep-Oct
Date Detail:
Created Date:  2002-Dec-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8703442     Medline TA:  Clin Exp Optom     Country:  -    
Other Details:
Languages:  ENG     Pagination:  185-192     Citation Subset:  -    
Affiliation:
Indiana University School of Optometry, 800 E Atwater Avenue, Bloomington, Indiana, 47405, United States.
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