Document Detail

Glare testing in cataract patients: instrument evaluation and identification of sources of methodological error.
MedLine Citation:
PMID:  2724115     Owner:  NLM     Status:  MEDLINE    
This study sought to determine the relative sensitivity of two commercially available glare testers in predicting outdoor acuity in a population of patients with minimal cataracts. Two target optotypes were evaluated: high contrast letters and varying contrast sinusoidal gratings. Although both instruments demonstrated a significant correlation between indoor and outdoor acuity, they showed a significant difference between predicted outdoor acuity and obtained visual acuity. The brightness acuity tester on high intensity was inaccurate in predicting outdoor vision regardless of test optotype, overpredicting glare disability in 76% (average) of the study population. Glare disability overpredictions fell to 8% on the medium setting with +/- 2 lines of vision classified as "no change." Using the same criterion, the Miller-Nadler glare tester overpredicted glare disability in 2% of the cataract population but underpredicted glare disability in 62%. In this study, letter optotypes resulted in less variability than sinusoidal grating stimuli. In addition, we identify several methodological factors to consider before designing a glare experiment. These potential sources of error can influence the outcome of any glare study that compares indoor and outdoor acuity and include the study population, visual stimuli (optotypes), and elements of the outdoor testing situation.
T C Prager; R G Urso; J T Holladay; R H Stewart
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of cataract and refractive surgery     Volume:  15     ISSN:  0886-3350     ISO Abbreviation:  J Cataract Refract Surg     Publication Date:  1989 Mar 
Date Detail:
Created Date:  1989-07-13     Completed Date:  1989-07-13     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8604171     Medline TA:  J Cataract Refract Surg     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  149-57     Citation Subset:  IM    
University of Texas Medical School, Department of Ophthalmology, Houston.
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MeSH Terms
Cataract / physiopathology*
Contrast Sensitivity*
Evaluation Studies as Topic
Eye / physiopathology*
Middle Aged
Vision Tests / instrumentation,  methods*
Visual Acuity*

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

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