| An evaluation of the Amblyopia and Strabismus Questionnaire using Rasch analysis. | |
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MedLine Citation:
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PMID: 20053981 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To evaluate whether the Amblyopia and Strabismus Questionnaire (A&SQ) is a suitable instrument for the assessment of vision-related quality-of life (VR-QoL) in individuals with strabismus and/or amblyopia. METHODS: The A&SQ was completed by 102 individuals, all of whom had amblyopia, strabismus, or both. Rasch analysis was used to evaluate the usefulness of individual questionnaire items (i.e., questions); the response-scale performance; how well the items targeted VR-QoL; whether individual items showed response bias, depending on factors such as whether strabismus was present; and dimensionality. RESULTS: Items relating to concerns about the appearance of the eyes were applicable only to those with strabismus, and many items showed large ceiling effects. The response scale showed disordered responses and underused response options, which improved after the number of response options was reduced from five to three. This change improved the discriminative ability of the questionnaire (person separation index increased from 1.98 to 2.11). Significant bias was found between strabismic and nonstrabismic respondents. Separate Rasch analyses conducted for subjects with and without strabismus indicated that all A&SQ items seemed appropriate for individuals with strabismus (Rasch infit values between 0.60 and 1.40), but several items fitted the model poorly in amblyopes without strabismus. The AS&Q was not found to be unidimensional. CONCLUSIONS: The findings highlight the limitations of the A&SQ instrument in the assessment of VR-QoL in subjects with strabismus and especially in those with amblyopia alone. The results suggest that separate instruments are needed to quantify VR-QoL in amblyopes with and without strabismus. |
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Authors:
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Marta Vianya-Estopa; David B Elliott; Brendan T Barrett |
Publication Detail:
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Type: Evaluation Studies; Journal Article Date: 2010-01-06 |
Journal Detail:
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Title: Investigative ophthalmology & visual science Volume: 51 ISSN: 1552-5783 ISO Abbreviation: Invest. Ophthalmol. Vis. Sci. Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-05-03 Completed Date: 2010-05-19 Revised Date: 2010-12-16 |
Medline Journal Info:
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Nlm Unique ID: 7703701 Medline TA: Invest Ophthalmol Vis Sci Country: United States |
Other Details:
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Languages: eng Pagination: 2496-503 Citation Subset: IM |
Affiliation:
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School of Optometry and Vision Science, University of Bradford, Bradford, United Kingdom. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amblyopia
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psychology* Disability Evaluation* Female Health Status Indicators Humans Male Middle Aged Quality of Life / psychology* Questionnaires* Sickness Impact Profile* Strabismus / psychology* Visual Acuity |
| Comments/Corrections | |
Comment In:
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Invest Ophthalmol Vis Sci. 2010 Dec;51(12):6898; author reply 6899-900
[PMID:
21123787
]
Invest Ophthalmol Vis Sci. 2010 Dec;51(12):6898-9; author reply 6899-900 [PMID: 21123786 ] |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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