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Development of the 25-item Cardiff Visual Ability Questionnaire for Children (CVAQC)

Khadka, Jyoti, Ryan, Barbara, Margrain, Thomas Hengist, Court, Helen Jane and Woodhouse, Joy Margaret 2010. Development of the 25-item Cardiff Visual Ability Questionnaire for Children (CVAQC). British Journal of Ophthalmology 94 (6) , pp. 730-735. 10.1136/bjo.2009.171181

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Abstract

Aims To develop and validate a short questionnaire to assess self-reported visual ability in children and young people with a visual impairment. Methods A list of 121 items was generated from 13 focus groups with children and young people with and without a visual impairment. A long 89-item questionnaire was piloted with 45 visually impaired children and young people using face-to-face interviews. Rasch analysis was used to analyse the response category function and to facilitate item removal ensuring a valid unidimensional scale. The validity and reliability of the short questionnaire were assessed on a group of 109 visually impaired children (58.7% boys; median age 13 years) using Rasch analysis and intraclass correlation coefficient (ICC). Results The final 25-item questionnaire has good validity and reliability as demonstrated by a person separation index of 2.28 and reliability coefficient of 0.84. The items are well targeted to the subjects with a mean difference of −0.40 logit between item and person means, and an ICC of 0.89 demonstrates good temporal stability. Conclusion The Cardiff Visual Ability Questionnaire for Children (CVAQC) is a short, psychometrically robust and a self-reported instrument that works to form a unidimensional scale for the assessment of the visual ability in children and young people with a visual impairment.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Optometry and Vision Sciences
Subjects: R Medicine > RE Ophthalmology
Publisher: BMJ Publishing Group
ISSN: 0007-1161
Last Modified: 15 Dec 2017 09:26
URI: http://orca.cf.ac.uk/id/eprint/23948

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