Repeatability and comparability of two different versions of the BFB
Research type
Research Study
Full title
Repeatability and comparability of two different versions of the Bagolini Filter Bar for measuring density of suppression in a paediatric population.
IRAS ID
151685
Contact name
Helen Davis
Contact email
Sponsor organisation
The University of Sheffield
Research summary
TITLE: Repeatability and comparability of different Bagolini Filter Bars to measure the risk of double vision in children.
QUESTION: Is there a difference in measurement with: (a) a repeated measure of the same bar; (b) different bars of the same version; (c) the new Bagolini Filter Bar compared to the old version.
BACKGROUND: A piece of diagnostic equipment called the Bagolini Filter Bar (BFB) is used regularly in orthoptic assessments for children late in their visual development, if they have no use of their eyes as a pair and are undergoing patching treatment for a lazy eye. The measurement is necessary in this situation to determine whether there is risk of causing double vision with the patching treatment. The original bar is no longer produced and a replacement has been manufactured, but orthoptists have noticed differences between the two versions. No studies were found that include children to compare the two versions.
METHODS: 58 5-12 year olds, with a squint in one eye and no use of their eyes as a pair, will be recruited from the Orthoptic Department at Chesterfield Royal Hospital. Parental consent will be received and data will be collected at the end of a routine appointment. A repeated measures design will be used where each participant completes the diagnostic test with 2 bars of each version in addition to a repeated measure with one old and one new bar. Each test will involve looking at a torch through up to 17 red filters of increasing density on the BFB. The participant will report when the torch changes colour or 2 torches are seen.
RESULTS: 6 groups of non-parametric data will exist for analysis. The Friedman test will test for any difference between groups. The Wilcoxon signed rank test will analyse different groups of data to address the research questions.REC name
Yorkshire & The Humber - South Yorkshire Research Ethics Committee
REC reference
14/YH/0089
Date of REC Opinion
15 Apr 2014
REC opinion
Further Information Favourable Opinion